STL - BWI

$65 Find Cheap Flights from St. Louis to Baltimore

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Baltimore departing on 1/11. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags

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These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Baltimore, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Baltimore, as well as popular online travel agencies
In the last 7 days travelers have searched 46,646,933 times on KAYAK, and here is why:

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Cheap Flight Deals from St. Louis to Baltimore (STL-BWI)

 
These are the cheapest deals for flights from St. Louis to Baltimore currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from St. Louis to Baltimore

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from St. Louis to Baltimore.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
5:02 pm - 8:07 amSTL-BWI
14h 05m1 stop
9:15 am - 11:24 pmBWI-STL
15h 09m1 stop
$118Frontier
Find Deal
Wed, Dec 4 - Mon, Dec 9
11:31 am - 6:24 pmSTL-BWI
5h 53m1 stop
9:20 pm - 8:15 amBWI-STL
11h 55m1 stop
$138Frontier
Find Deal
Mon, Dec 9 - Sun, Dec 15
6:10 pm - 1:15 pmSTL-BWI
18h 05m1 stop
6:15 pm - 7:40 pmBWI-STL
2h 25mnonstop
$191Southwest
Find Deal
Mon, Jan 27 - Tue, Jan 28
6:10 pm - 11:00 amSTL-BWI
15h 50m1 stop
2:30 pm - 7:25 pmBWI-STL
5h 55m1 stop
$200Southwest
Find Deal
Mon, Jan 27 - Tue, Jan 28
7:15 am - 1:04 pmSTL-BWI
4h 49m1 stop
6:00 am - 12:03 pmBWI-STL
7h 03m1 stop
$216Delta
Find Deal
Mon, Dec 16 - Wed, Dec 18
7:05 pm - 12:38 amSTL-BWI
4h 33m1 stop
7:00 am - 12:03 pmBWI-STL
6h 03m1 stop
$217Delta
Find Deal
Thu, Dec 12 - Mon, Dec 16
5:45 am - 11:22 amSTL-BWI
4h 37m1 stop
6:06 pm - 9:53 pmBWI-STL
4h 47m1 stop
$392American Airlines
Find Deal
Thu, Dec 26 - Thu, Jan 2
5:40 pm - 10:55 pmSTL-BWI
4h 15m1 stop
10:10 am - 3:34 pmBWI-STL
6h 24m1 stop
$508United Airlines
Find Deal
Mon, Dec 2 - Tue, Dec 3
2:30 pm - 10:17 pmSTL-BWI
6h 47m2 stops
8:04 pm - 11:59 pmBWI-STL
4h 55m1 stop
$598American Airlines
Find Deal
Wed, Dec 11 - Sat, Dec 14
11:20 am - 8:54 pmSTL-BWI
8h 34m1 stop
10:10 am - 2:25 pmBWI-STL
5h 15m1 stop
$651United Airlines
Find Deal
Fri, Dec 6 - Tue, Dec 10

Flights from St. Louis to Baltimore - Travel Insights & Trends

Get data-powered insights and trends into flights from St. Louis to Baltimore to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from St. Louis to Baltimore?

The average price of all flights from St. Louis to Baltimore clicked on KAYAK for each day over the last 12 months.
Your flight ticket price will generally be cheaper if you fly to Baltimore on a Thursday and more expensive on a Sunday. On your return trip to St. Louis, you should consider flying back on a Tuesday, and avoid Mondays for better deals.

What is the cheapest month to fly from St. Louis to Baltimore?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from St. Louis to Baltimore, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from St. Louis to Baltimore is September, where tickets cost $254 on average. On the other hand, the most expensive months are March and November, where the average cost of tickets is $432 and $386 respectively.

How far in advance should I book a flight from St. Louis to Baltimore?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from St. Louis to Baltimore, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from St. Louis to Baltimore, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 32 days before departure.

Good to know

Low season

February

High season

November

Cheapest flight

$65
Best time to beat the crowds with an average 5% drop in price.
Most popular time to fly with an average 8% increase in price.
Flight from St. Louis to Baltimore

When to book flights from St. Louis to Baltimore

Are your dates flexible? Find out the best times to travel from St. Louis to Baltimore based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Baltimore

  • What is the cheapest flight from St. Louis to Baltimore?

    In the last 3 days, the lowest price for a flight from St. Louis to Baltimore was $65 for a one-way ticket and $118 for a round-trip.

  • Do I need a passport to fly between St. Louis and Baltimore?

    A passport is not required to fly from St. Louis to Baltimore.

  • Which airports will I be using when flying from St. Louis to Baltimore?

    When flying out of St. Louis you will be using Lambert-St Louis. You will be landing at Baltimore, also known as Baltimore/Washington.

  • Which airlines offer Wi-Fi service onboard planes from St. Louis to Baltimore?

    American Airlines, and Delta offer inflight Wi-Fi service on the St. Louis to Baltimore flight route.

  • Which aircraft models fly most regularly from St. Louis to Baltimore?

    The Boeing 737-700 Passenger/BBJ1 (winglets) is the aircraft model that flies most regularly on the St. Louis to Baltimore flight route.

  • On which days can I fly direct from St. Louis to Baltimore?

    There are nonstop flights from St. Louis to Baltimore on a daily basis.

  • Which is the best airline for flights from St. Louis to Baltimore, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from St. Louis to Baltimore are Southwest and Delta. With an average price for the route of $384 and an overall rating of 8.1, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $355 and an overall rating of 8.0.

  • How does KAYAK find such low prices on flights from St. Louis to Baltimore?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Baltimore.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Baltimore?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Baltimore from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Baltimore?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Baltimore with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and BWI can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Baltimore?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Baltimore from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

KAYAK’s top tips for finding a cheap flight from St. Louis to Baltimore

  • Looking for a cheap flight? 25% of our users found flights on this route for $268 or less one-way and $371 or less round-trip.

Prefer to fly non-stop from St. Louis to Baltimore?

Find which airlines fly direct from Lambert-St Louis Airport to Baltimore/Washington Airport, which days they fly and book direct flights.

Nonstop departures

Lambert-St Louis to Baltimore/Washington

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Nonstop returns

Baltimore/Washington to Lambert-St Louis

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights
See more direct flights

Top 5 airlines serving from St. Louis to Baltimore

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Baltimore. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Baltimore? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.1
SouthwestOverall score based on 5005 reviews
7.2Food
8.2Boarding
8.7Crew
7.7Entertainment
8.1Comfort
Airline reviews

Planes are aged. The wifi is unreliable and on many fights, no-existent. The flight attendants were very good.

6.0 Goodjohn, Nov 2024TPA - BWI
Read more Southwest reviews

Planes are aged. The wifi is unreliable and on many fights, no-existent. The flight attendants were very good.

Exceptional crew! Friendly and professional. Pleasant attitude and treated everyone with respect.

Boarded the plane in Portland and sat on the tarmac for four hours before being given clearance to take off. Apparently a "scratch" was detected on the preflight inspection. This delay resulted in me missing my connection in Baltimore. I therefore had to stay overnight and then catch an early flight this morning, which resulted in my missing a mandatory class. I would like a refund / voucher to cover the cost of the missed flight. And additional voucher for the time spent on the plane in Portland would also be appreciated.

Crew was pleasant; flight was on time. Paid extra for early bird check-in and still got B boarding.

I will be flying again Southwest Airlines. Friendly crew, comfortable and affordable.

Crew was great - friendly and helpful with boarding - letting folks know where overhead space was available thus getting us out of the gate on time.

The first leg of the trip was great. The second leg from BWI to RIC was late, which was more screenful and tiring that late in the evening.

The flight was promptly on schedule and Southwest delivered everything they promised. No excuses for any shortfalls just 100% ownership of their responsibilities and business. The boarding and seating policy is a complete shambles. What started out as a great idea when Southwest first hit the market has been turned into a disaster due to the lack of integrity in many of the people who fly Southwest and take advantage of Southwest generosity at the expense of their fellow passengers.

Was ok. Had about a 1 hour delay and snack was not good.

Delayed time changed often. Temperature on the plan was hot. Crew did offer us water. Then we had to offload to get on another flight that left after 10p

I sat in comfort plus. It was fine. Seats were comfortable. I got drinks and snacks.

Crew was nice. Flight was timely. Seats could be better as well as the food considering it’s first class.

Left on time and arrived early this extending our 31 minute transfer. Bags made it also!

Good and consistent Printer in lounge did not work for me :(

Most of my discomfort was going through TSA. However, the Delta seats had inadequate leg room and I tried my very best to connect to the wi-fi and it was a cumbersome process that finally gave me the info that I needed to sign in AFTER I had completed the flight...Why make it so difficult to use? That said I really really appreciate the pilot taking a little extra time to avoid a bad storm area and both landings in Atlanta and Orlando were flawless to my delight!!!

Delayed in taking off because no flight crew. The in seat entertainment was working properly.

I upgraded to first class only to find out that I still had no access to the sky lounge without a sky miles card or AmEx (something that should be emphasized outside of the fine print!) Also, no food or drink service provided during the flight, so I basically paid 4x more just for “free” checked baggage and a bigger seat. Not worth it.

Delta was really good about being transparent with why we were delayed it’s just that’s the plane was really old and outdated and a lot of the comfort and amenities we know Delta to have did not shine through

Bottom seat cushion is almost non existent. Very uncomfortable seat.

Delta was great the entertainment was outdated. Screen was very small and didn’t work.

There was no USB plug in my section of the plane. So I could not charge my phone. Also, there was no screen to watch movie or anything like that. Wish I had known that in advance, I would’ve brought my iPad.

The flight attendants were unhelpful. It was a packed flight, and usually a flight attendant would help find a spot in the bin for your carry on or shift things around. Neither made any effort to do so. Also, I had to then check my bag. I was told it would be on the carousel in YYZ, but it came up on the jetway. So lucky I saw others standing around for their bags. I would have walked straight past this and on to the carousel. They could have at least told me that they had given me wrong information. Very unsatisfactory.

Made all groups except 2 check despite ample bin space. Inflight WiFi and entertainment didn’t work most of the time.

The check-in process is not the best They should have agents in site to help with any problem especially a rebook. Why does one have to get on the phone when there were at least 8 agents around that could have help?! Flying is stressful as it is and having someone willing to do their customer service will ease some of the stress.

It was a good flight. Nothing comes to mind about how it could have been better. It was a newer plane, seemed like a great upgrade from your older ones. Staff was very good as well.

boarding was uneventful. Snack was pathetic. A tiny fruit bar. Entertainment was limited to just select movies on your own tablet or phone. No live TV. I recently flew Jetblue and they had unlimited snacks and live satellite TV the entire flight. My seat was an exit seat, 20A. It was super uncomfortable. It felt cramped and the middle seat was taken up by a large woman who pushed into my shoulder and arm. Horrible flight.

They canceled our flight and left us stranded to figure it out

Cabin was pitch black, even during meal service. The reading lights for seat 2E/F did not work, and seat 2E did not recline.

Long wait before take off without an update for 20 minutes. Flight was good otherwise.

Plane still had screens for watching movies. Good selection too.

It was as expected for such a short flight. No complaints

The departing flight from Newark to Charlotte was fine. It was the returning flight from Charlotte to Newark that was awful. We had scheduled an 8:35pm return flight time. We got delayed TEN times all the way to 5am in the morning! We were told over 4 different excuses as to why the flight kept getting delayed. First it was the flight crew needed to rest, then it was something technical with the plane, then it was something with air traffic control, and finally it was because they couldn’t find a captain and had to wait until the morning so the captain could get some rest. It was terrible sleeping overnight in the airport. They offered a $12 meal voucher. That was it! And the only place open in the middle of the night was Dunkin’ Donuts who didn’t even accept the voucher. They should have cancelled the flight much earlier on in the evening instead of just stringing us along hour by hour with more delays. Not professional and unacceptable. There was no refund for inconvenience. I probably will not be flying American Airlines again.

This leg they tried and did well with what they had to work from.

It was nice being on a flight that had working wifi. The boarding was quick - why don’t all airlines have small boarding groups window to aisle? Makes so much sense!!! I was disappointed to be the first person stopped to have to gate check my carryon. Especially when there was plenty of overhead space at the back! But I get it…keeps it moving. Crew was nice.

The flight was as good as it gets when flying. On time departure and arrival plus no lost luggage.

My boarding pass wouldn't pull up in the app very easily and had to really dig through my email. That caused a delay in TSA..

Packed commercial flight was as comfortable as can be expected

My seat was very worn. Otherwise I had an excellent flight

I'm not a valued flyer so I'm always in the last group to board...that sucks, always

My flight back my reservations were list because they said I didn't pay my pet fee when I had a receipt

Booked direct in July '24. Turned into a 14 hr layover (both ways) in Denver. My 5 day vaca turned into a 1 day . Not good, BUT,... Thank you for the people @ Frontier who were professionally friendly & approachable.

Stop changing gates at sfo. When you are elderly going back for it’s not fun.

We understand and comply with Frontier’s bag sizes. We’ve had some problems in past while having to await other passengers who do not understand the baggage restrictions or have not prepaid and that is usually our biggest concern (others delaying us) with flying Frontier. Flying OUT of ONT, however, has always been a great experience. I’ve also noted even on delayed Frontier flights very knowledgeable pilots who manage expectations well.

There was no easy way to check in. I don't want to install an app to checkin. I will use alaska from now on because they have a web check in method that is easy.

The crew was ghetto lol I felt like I was on an inner city field trip

Horrible! The short distance flight ended up taking 5 hrs! There was a 3 hr delay for the flight to take off and there was a 70 min wait on the tarmac for some bogus reason that the pilot said the gate he was supposed to board was taken up. After a 30 min wait he said the plane that was supposed to push out of the gate called a medical emergency and 40 min later he ended up boarding another gate. For the initial 3 hr delay there was no information/alert about the gate or delay in the app or the boards up until the boarding time and even beyond! Had to walk all the way to the end of the terminal to find the frontier staff to ask what was going on. Avoid this airline at all costs! If you have carryon bags or checked bags , their prices come equivalent to the prices of more reliable airlines. They are the worst in timeliness at 60% (reported as delayed) this year (check the data) by a high margin even compared to the second worst airline. If you are ok with having a miserable flight experience with the odds close to flip of a coin, feel free to try them. If you value your time , money and flying experience, stay away.

There was nothing to like, flight delayed had to move to different departure areas, disorganized to say the leasr

Delayed for two hours due to trivial issues. No reimbursment. Also on arrival further delay due to terminal malfunction.

Our flight was canceled for no known reason. We weren’t told until we were checking in at 5:00 am. This was after our last flight with Frontier where we sat on the plane for three hours (not an exaggeration) before we took off because of a mechanical issue. We won’t be flying Frontier again.

Allowed me to chose my seat without extra charge (I purchased full-price ticket) and boarding was in group1. Didn't even serve water.

Book cheap flights from St. Louis to Baltimore

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from St. Louis to Baltimore found on KAYAK in the last 72 hours.
1/11Sat
1 stopFrontier
13h 47mSTL-BWI
$65
1/26Sun
1 stopFrontier
8h 46mSTL-BWI
$69
12/24Tue
1 stopDelta
6h 21mSTL-BWI
$108
1/6Mon
nonstopSouthwest
2h 00mSTL-BWI
$109
1/23Thu
1 stopDelta
4h 41mSTL-BWI
$118
12/16Mon
1 stopAmerican Airlines
5h 26mSTL-BWI
$128
12/31Tue
nonstopSouthwest
2h 00mSTL-BWI
$129
1/31Fri
1 stopUnited Airlines
6h 21mSTL-BWI
$158
2/17Mon
1 stopUnited Airlines
4h 40mSTL-BWI
$182
12/29Sun
1 stopAmerican Airlines
4h 46mSTL-BWI
$243

Search by stops

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Last minute flights from St. Louis to Baltimore

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from St. Louis to Baltimore that are departing in the next 10 days.
11/22Fri
multi-stopFrontier
13h 47mSTL-BWI
12/4Wed
multi-stopFrontier
14h 14mBWI-STL
$308
11/22Fri
multi-stop
27h 15mSTL-BWI
12/4Wed
multi-stop
33h 26mBWI-STL
$343
11/22Fri
multi-stop
27h 15mSTL-BWI
12/4Wed
multi-stop
21h 02mBWI-STL
$356
11/22Fri
multi-stopFrontier
13h 47mSTL-BWI
11/23Sat
multi-stopFrontier
11h 02mBWI-STL
$388
11/24Sun
multi-stopSpirit Airlines
7h 08mSTL-BWI
11/25Mon
multi-stopSpirit Airlines
19h 08mBWI-STL
$538
11/24Sun
multi-stopSpirit Airlines
16h 31mSTL-BWI
11/25Mon
multi-stopSpirit Airlines
24h 08mBWI-STL
$539
11/22Fri
multi-stopSouthwest
5h 45mSTL-BWI
12/4Wed
nonstopSouthwest
2h 25mBWI-STL
$609
11/22Fri
nonstopSouthwest
2h 00mSTL-BWI
12/4Wed
nonstopSouthwest
2h 25mBWI-STL
$610
11/22Fri
multi-stopUnited Airlines
4h 42mSTL-BWI
11/26Tue
multi-stopUnited Airlines
4h 32mBWI-STL
$820
11/25Mon
multi-stopUnited Airlines
4h 15mSTL-BWI
12/2Mon
multi-stopUnited Airlines
9h 10mBWI-STL
$960

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Everything you need to know for your flight from St. Louis to Baltimore

Information on your arrival and departure airports

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