STL - BWI

$105 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 7/2. 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.
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KAYAK searches hundreds of travel sites at once for deals on flights to Baltimore

 
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
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Flights Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Baltimore that are departing in the next months. 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

KAYAK's recommended round-trip deals from the most popular airlines that fly from St. Louis to Baltimore.
Discover the best prices for you by selecting your travel dates on KAYAK.
American Airlines Logo
6:47 pm - 11:53 pmSTL-BWI
4h 06m1 stop
American Airlines Logo
5:27 pm - 9:26 pmBWI-STL
4h 59m1 stop
$199American Airlines
Find Deal
Sat, May 31 - Tue, Jun 3
Frontier Logo
5:45 pm - 8:39 amSTL-BWI
13h 54m1 stop
Frontier Logo
2:19 pm - 11:44 pmBWI-STL
10h 25m1 stop
$208Frontier
Find Deal
Wed, May 21 - Sat, May 24
Delta Logo
5:00 pm - 12:49 amSTL-BWI
6h 49m1 stop
Delta Logo
7:00 am - 11:54 amBWI-STL
5h 54m1 stop
$209Delta
Find Deal
Sat, May 31 - Sat, Jun 7
Delta Logo
3:40 pm - 9:25 pmSTL-BWI
4h 45m1 stop
Delta Logo
6:00 am - 9:35 amBWI-STL
4h 35m1 stop
$219Delta
Find Deal
Sat, May 24 - Tue, May 27
 Logo
10:10 am - 6:52 pmSTL-BWI
7h 42m1 stop
 Logo
2:14 pm - 11:52 pmBWI-STL
10h 38m1 stop
Sat, May 24 - Sun, May 25
Southwest Logo
12:45 pm - 5:35 pmSTL-BWI
3h 50m1 stop
Southwest Logo
9:10 am - 10:25 amBWI-STL
2h 15mnonstop
$254Southwest
Find Deal
Wed, May 21 - Sun, May 25
United Airlines Logo
3:20 pm - 9:42 pmSTL-BWI
5h 22m1 stop
United Airlines Logo
10:51 am - 3:44 pmBWI-STL
5h 53m1 stop
$259United Airlines
Find Deal
Mon, Aug 25 - Wed, Aug 27
Southwest Logo
8:10 pm - 11:10 pmSTL-BWI
2h 00mnonstop
Southwest Logo
9:10 am - 10:25 amBWI-STL
2h 15mnonstop
$263Southwest
Find Deal
Wed, May 21 - Sun, May 25
 Logo
5:55 pm - 6:36 pmSTL-BWI
23h 41m1 stop
 Logo
9:00 am - 6:32 pmBWI-STL
10h 32m1 stop
Fri, May 9 - Tue, Aug 12
United Airlines Logo
8:00 am - 1:48 pmSTL-BWI
4h 48m1 stop
United Airlines Logo
6:15 am - 12:27 pmBWI-STL
7h 12m1 stop
$348United Airlines
Find Deal
Fri, Jul 4 - Thu, Aug 7
Expert advice

Expert advice for your flight from St. Louis to Baltimore

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airports
STL

For a smooth departure, avoid peak hours at STL, especially early mornings and afternoons, to bypass crowded terminals and long security lines.

Read more about STLby Yulia Denisyuk
BWI

Take the light rail from BWI to downtown Baltimore for a cost-effective and convenient travel option, with a station just outside the terminal.

Read more about BWIby Harriet Baskas
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on BWI

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia Denisyuk

Yulia Denisyuk

Yulia is a freelance journalist who’s dispatched from 90+ countries. Her work focuses on cultures, adventure trips and air travel, appearing in NatGeo, NYT, CNTraveler, and more. For past assignments, she’s stayed with nomads in Mongolia and learned the art of Imigongo in Rwanda. She’s based in Chicago; in winter she often questions that decision.

Read more
Useful Info

KAYAK's insights & trends for St. Louis to Baltimore flights

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 round-trip flights from St. Louis to Baltimore clicked on KAYAK for each day over the last 12 months.
When flying from St. Louis to Baltimore, you should consider leaving on a Tuesday and avoid Saturdays if you are looking for the best rates. For your return to St. Louis, you’ll find the best rates on Tuesdays and the most expensive ones on Sundays.

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 round-trip 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 (return) on average. On the other hand, the most expensive months are December and November, where the average cost of round-trip tickets is $404 and $386 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip 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 week.
To get a below average price on the flight from St. Louis to Baltimore, you should book around 3 weeks before departure. For the absolute cheapest price, our data suggests you should book 12 weeks before departure.

Good to know

Low season

January

High season

May

Cheapest flight

$105
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly with an average 3% 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 $105 for a one-way ticket and $199 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 $376 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $340 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.

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 $164 or less one-way and $308 or less round-trip.

Prefer to fly direct 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.

Direct 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

Direct 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.
8.0
SouthwestOverall score based on 4295 reviews
7.6Entertainment
7.1Food
8.2Boarding
8.6Crew
8.0Comfort
Airline reviews

It is southwest seat was ok. Not the most comfortable seat

8.0 ExcellentJohn, Apr 2025PVD - FLL
Read more Southwest reviews

It is southwest seat was ok. Not the most comfortable seat

I’ve always loved Southwest. No issues at all. I was flying standby and the gate agent was extremely friendly and helpful. Boarding was smooth and I was able to get a window seat in the emergency exit row. Crew was fantastic! They were very professional and accommodating. We had to divert from our destination due to weather but the flight crew kept everyone at ease and informed us of all pertinent information. Excellent flight

The price of the tickets isn't matching the flight experience. No matter how long the flight is, you're only getting pretzels. The flight attendants looked unkept and over it.

Plz don't take away free bags and free seating

The seats were a bit cramped and worn, but otherwise okay.

I would have liked to arrive on time - not 5 hours late!

After a 3 hour layover in Denver my flight was delayed over 5 hours! No explanation; no assistance; no offer to provide compensation; no one at Southwest was willing to offer any assistance. 8 hours in the Denver airport - ridiculous!

It was a perfect flight in all aspects! Both legs!

Only one drink pass through the cabin for a 4 hour flight. Quite rough and bumpy landing.

Boarding process, crew were good. But the seats were so uncomfortable that was all I could focus on. I literally had to sit forward so that all 3 of us could fit in row. I will try to avoid Southwest in the future for any flights over 60 minutes.

Delta is my preferred airline. I've traveled with them for years. On time in most cases, good communication, easy to use app. Most planes are pretty nice. I was on a CRJ 700/900 however, which was pretty badly aged inside and needed a refresh. No infotainment, unreliable wifi, best to download before boarding or bring a book. Food choices are really just snacks on this flight, nice variety but about what you'd expect. Great staff and prompt in departure and early arrival too. Overall quite satisfied.

Crew was friendly Love the entertainment in the seat head rest.

Delta flight was on time, seats were comfortable, and crew was nice.

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

Delayed take-off. Very small plane so very scary with lots of bumps during the flight. Would never fly Delta on short flights in small 80 seaters plane again! Felt relieved when landed.

The worst part was I was NOT allowed in the lounge even though I was holding a first class ticket and have a premium American Express card. I have flown Business or First Class with many airlines. Delta is the ONLY one who does not extend this courtesy to anyone except people who hold the very expensive American Express card. As a result, I won’t fly Delta if I have any other choice.

A little bumpy ride . No food was being provided due the the turbulence. That was ok it was a short flight to my standards.

Simply outstanding. Their new lounge for Delta One customers is a cut above the rest.

The Dekta Rep that checked us in was great. She's very personable, pleasant, and can tell she enjoys her job.

The plane was old with small storage areas that had problems closing/latching and not enough storage for everyone, and worn, damaged seats. Service was great but feel a little unsafe on such well used planes.

A bit rush for transit. Food and entertainment are not available

Multiple delays and not straight answer from the United team

Stewardess spilled orange juice on my clothes/seat no help no apology just threw napkins at me to clean the mess up. Not Happy.

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

The plane pushed back from the gate on time. However, it stopped on the ramp, and we waited for over 20 minutes before the aircraft pulled back to the gate. Apparently, something of importance had to be removed from the aircraft by the gate agent. I found this to be odd. The delay was not significant, but I felt that whatever was on the aircraft that had to be taken off, should’ve been done before we pushed back from the gate.

Electric plugs didn't work. Entertainment system wasn't working

The design of the light switch on the arm rest is ridiculous.

Smooth boarding process. Early departure, smooth flight, early arrival. The entertainment package has very good recent movie options. The flight crew were friendly and professional.

leg space better than expected. two washrooms for one plane isn't enough.

The gate attendant let me walk right by her with a bag too big for the overhead compartment

Several delays. Next flight was worse. Did not arrive home until 2am PT

Very helpful ground crew after an earlier flight delay and being rebooked on a different flight.

Everything about the flight was lovely…We left early, arrived early, cabin crew were efficient and helpful. Flight was easy and most pleasant.

First world problems, but still… We were seated in first class and asked for a cocktail on a very short, 50 minute flight. After our drink order was taken, a half hour went by, and we noticed that every other person in the small plane had been served except for us. We got up to ask about it, the drinks finally came, then were taken away three minutes later since the flight was so short. Really strange situation, on the other hand, we were in Utah.

We missed our flight. The boarding pass had the wrong gate and by the time we received the text from Kayak, our flight was already gone. I’ll never use Kayak again and will go direct to the airlines in the future.

Boarding took forever, the plane was cramped and cold, and the seatbelt song came on constantly throughout the red eye flight with a loud pre-recorded message playing each time

Cabin felt crammed Snacks are lame But crew was super efficient getting us out on time despite delay

Took off on time and successfully avoided weather that looked to be a problem along the way

There were five broken seats on the plane. The crew was very rude in telling people they had to get off the plane and get a flight the next day. No call for volunteers, but telling people they had to get off. One woman was flying with her elderly mother and daughter and was told she had to leave or all three had to leave. Fortunately, a volunteer offered to stay. The situation was handled poorly.

The flight to Tokyo AA61 took off about two hours late, but then had to turn back. By that time the crew had to be replaced. Then they kept promising to take off in an hour, then in 3, then switch to the next day.

My costume jewelry was stolen out of my bag. Got to airport and my bag weighed 45 pounds- 5 pounds over cost me $100 Long lines in tier one. No entertainment No WiFi no free drinks or snacks

Not very good. Paid in excess of $400 for assigned seating for my family and that was not provided. I want that money back.

The seats were hard molded plastic covered in plastic vinyl. And the scam to charge people extra to sit together. Don’t they know we can just ask someone to trade seats. And watching the staff separate young children from parents… super classy. We had to guilt them into offering up our seats. This companies policies suck. Don’t give them your money.

The seats were awful, hard plastic covered in sheet vinyl. The airline tries to scam you into paying extra to get seat together when the flight wasn’t full. They were going to separate a family with young children but my wife who had a row to herself gave up her seat so the young mom could be with her young boys. I’m never giving this airline my money again.

It was a short flight so no food or entertainment….

Seats are uncomfortable but price is good. Guess I can put up with misery for four hours.

I’ve never traveled on Frontier before. If you want basic, no frills, friendly service at great prices then give them a fly!

Cancelled and declined to find alternatives Earlier flight is 2 days later Sent the cancellation notification very late, wish I knew earlier would have stayed to watch the Miami open final game Very disappointing service

The worst flight of my life. Never will I fly frontier again

Landing in terminal 2, but my luggage is terminal 3. We (and others) were looking for it in terminal 1. We probably missed the crew broadcast, but the communication could have been clearer for non native (or elderly) passengers.

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

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