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$57 Find Cheap Flights from Puerto Rico to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to St. Louis departing on 12/12. 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

Search hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results for flights to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results for flights to St. Louis, as well as popular online travel agencies
In the last 7 days travelers have searched 45,017,868 times on KAYAK, and here is why:

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Flights to St. Louis - Travel Insights & Trends

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

What is the cheapest day to fly to St. Louis?

The average price of all flights to St. Louis clicked on KAYAK for each day over the last 12 months.
Based on KAYAK data, the cheapest day to fly to St. Louis is Saturday where tickets can be as cheap as $341. On the other hand, the most expensive day to fly is Sunday, where prices are $530 on average.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights to St. Louis, 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 to St. Louis is February, where tickets cost $341 on average for one-way flights. On the other hand, the most expensive months are June and December, where the average cost of tickets from Puerto Rico is $550 and $490 respectively. For return trips, the best month to travel is February with an average price of $341.

What is the cheapest time of day to fly to St. Louis?

The average price for all flights to St. Louis depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.
The cheapest time of day to fly to St. Louis is generally at night, when flights cost $289 on average. The most expensive time of day to fly to St. Louis is generally in the morning, which is peak travel time and where the average cost of a ticket is $489.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights to St. Louis, 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, you should book around 0 weeks before departure. For the absolute cheapest price, our data suggests you should book 58 days before departure.

Good to know

Low season

January

High season

December

Cheapest flight

$57
Best time to beat the crowds but there is an average 8% increase in price.
Most popular time to fly with an average 13% increase in price.
Flight from San Juan to St. Louis

FAQs - booking St. Louis flights

  • How far is Lambert-St Louis Airport from central St. Louis?

    Lambert-St Louis Airport is 13 miles from the center of St. Louis.

  • What is the name of St. Louis’s airport?

    St. Louis is served by Lambert-St Louis Airport, also commonly referred to as Lambert Field, Lambert-St Louis, St. Louis Lambert, or St. Louis Lambert Intl. The airport code is STL.

  • How much is a flight to St. Louis?

    On average, a flight to St. Louis costs $267. The cheapest price found on KAYAK in the last 2 weeks cost $249 and departed from San Juan Luis Munoz Marin Intl Airport.

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

    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 to St. Louis.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to 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 to St. Louis?

    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 St. Louis with an airline and back with another airline.

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

    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 St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • How many direct flights to St. Louis are there each week?

    Each week there are around 2,039 direct flights from within Puerto Rico to St. Louis. The most common day for departures is Sunday, with 16% of flights taking off on this day.

See more FAQs

Top tips for finding cheap flights to St. Louis

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest St. Louis flight deals.

Prefer to fly non-stop to Lambert-St Louis?

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

Nonstop departures

Puerto Rico to Lambert-St Louis

Monday

ANA, Aer Lingus, Aeromexico, +39 more

ANA, Aer Lingus, +40 more

Tuesday

ANA, Aer Lingus, Aeromexico, +41 more

ANA, Aer Lingus, +42 more

Wednesday

ANA, Aer Lingus, Aeromexico, +40 more

ANA, Aer Lingus, +41 more

Thursday

ANA, Aer Lingus, Aeromexico, +40 more

ANA, Aer Lingus, +41 more

Friday

ANA, Aer Lingus, Aeromexico, +40 more

ANA, Aer Lingus, +41 more

Saturday

ANA, Aer Lingus, Aeromexico, +42 more

ANA, Aer Lingus, +43 more

Sunday

ANA, Aer Lingus, Aeromexico, +42 more

ANA, Aer Lingus, +43 more

See more direct flights

Nonstop returns

Lambert-St Louis to Puerto Rico

Monday

ANA, Aer Lingus, Aeromexico, +39 more

ANA, Aer Lingus, +40 more

Tuesday

ANA, Aer Lingus, Aeromexico, +41 more

ANA, Aer Lingus, +42 more

Wednesday

ANA, Aer Lingus, Aeromexico, +40 more

ANA, Aer Lingus, +41 more

Thursday

ANA, Aer Lingus, Aeromexico, +40 more

ANA, Aer Lingus, +41 more

Friday

ANA, Aer Lingus, Aeromexico, +40 more

ANA, Aer Lingus, +41 more

Saturday

ANA, Aer Lingus, Aeromexico, +42 more

ANA, Aer Lingus, +43 more

Sunday

ANA, Aer Lingus, Aeromexico, +42 more

ANA, Aer Lingus, +43 more

See more direct flights
See more direct flights

Top 4 airlines serving from Puerto Rico to St. Louis

 
See real verified KAYAK customer reviews for airlines flying to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Puerto Rico to St. Louis. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with to St. Louis? 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
DeltaOverall score based on 8828 reviews
8.2Boarding
7.9Comfort
8.5Crew
7.9Entertainment
7.3Food
Airline reviews

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!!!

6.0 GoodSus, Nov 2024GEG - ATL
Read more Delta reviews

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 love my flight attendant Faith, always smiles always helpful. She makes the flight experience wonderful thank you

My return flights were changed by the airline and my preferred seat selection with extra legroom was not transferred to the new flights

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.

Very dissatisfied with the fact that I had upgraded to first class for the second part of my trip only to find out that the lounge was still not available to me, as well as not having any food or drink service on the flight due to weather, so I lost out more than what I paid for.

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.

Flight did not have seat back entertainment and the wifi was iffy.

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.

The plane’s radio wasn’t working. This delayed the plane for an hour and a half. Then we all broaded and taxied down the runway only to get called back because the radio was still not working. Had to get off the plane and then find another plane making the trip 4 hours delayed. Maybe a different plane should have been chosen sooner?!?!?!

The food for long haul was poor compared to Singapore airlines economy. Pasta plain with tomato sauce . Singapore airlines give me Hagen dash small ice cream cup it was great. The choices of dinner course Singapore air also much better The crew mostly friendly. The economy seat are as expected.

The care and attention for my flight was great. The seats were not as comfortable.

ANA was great. United was horrible. They bumped us from economy plus to economy and were supposed to contact us for a refund but no luck. We booked the seats 9 months in advance.

The plane was clean. The staff was excellent. The flight attendants were very good. Enjoyable flight. Overall. The seats in the back are too small but, will always be.

I was at the back of the plane with earphones, and I could still hear the chatty flight attendants; I wasn't able to sleep at all.

There was no air on the plane and it was very hot.

Flight crew was amazing! I don't like that the Polaris seats are side-by-side.

Boarding was very smooth and arriving in Miami it was fast getting off the plane

The flight encountered a delay exceeding 4 hours. The food voucher issued was valued at $12, insufficient to cover our meal expenses. Consequently, I was unable to take my medication, leading to a drop in blood sugar levels and exacerbating my anxiety.

Great Team on the flight. I was the only one in the exit row and the flight attendant just sat down and we had a talk about my responsibilities sitting in the exit row. It was very humorous. During the flight every time one of the flight team members made eye contact, they smiled. It was a small thing, but it was a friendly environment.

Great flight from Charlotte to Orlando. In flight wifi and entertainment was not working til 25 minutes were left in the flight would be my only complaint.

More room. International flight - by the time you put your purse and shoes under the seat in front of you, add in the pillow and blanket they give you- makes for tight fit.

Boarding can be more efficiently done by having the back row passengers board first. This way, the other people do the have to wait for front row passengers to load their luggage in the overhead cabins. Food is simply pathetic for the price I paid. Cleanliness is simply poor; my seat was full of crumps.

Overall good. Tight connection in DFW because of gate unavailability upon landing.

Airplane was cold. Flight attendants were rude. Phone charger did not work. No food available.

The flight was very smooth, crew were fantastic but food was lacking.

No food, no entertainment. But the flight was really short so maybe they had to skip drinks. I was able to board early ONLY because I am old and decrepit and they let me pre-board. I RESENT your dumping us into category 9 if we do not pay up. And when I paid for a seat I was STILL given 9. The pre-boarding helps. THIS flight was exceptionally smooth, please congratulate the pilots.

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 Puerto Rico to St. Louis

Recent round-trip flight deals

 
These are the cheapest round-trip flights to St. Louis found on KAYAK in the last 72 hours.
1/28Tue
1 stopFrontier
13h 19mSJU-STL
2/4Tue
1 stopFrontier
15h 18mSTL-SJU
$134
12/5Thu
1 stopFrontier
8h 19mSJU-STL
12/9Mon
1 stopFrontier
15h 22mSTL-SJU
$152
12/5Thu
1 stop
8h 19mSJU-STL
12/9Mon
2 stops
19h 02mSTL-SJU
$237
2/19Wed
1 stopDelta
7h 24mSJU-STL
2/24Mon
1 stopDelta
7h 57mSTL-SJU
$254
1/28Tue
1 stopAmerican Airlines
16h 32mSJU-STL
2/4Tue
2 stopsAmerican Airlines
10h 23mSTL-SJU
$260
2/18Tue
1 stop
9h 47mSJU-STL
2/24Mon
3 stops
25h 25mSTL-SJU
$282
12/5Thu
2 stopsAmerican Airlines
9h 54mSJU-STL
12/8Sun
1 stopAmerican Airlines
13h 50mSTL-SJU
$293
12/4Wed
2 stopsUnited Airlines
12h 14mSJU-STL
12/8Sun
1 stopUnited Airlines
8h 21mSTL-SJU
$344
1/21Tue
1 stopUnited Airlines
10h 42mSJU-STL
1/27Mon
2 stopsUnited Airlines
10h 38mSTL-SJU
$383
4/16Wed
1 stopDelta
7h 40mSJU-STL
4/21Mon
1 stopDelta
9h 29mSTL-SJU
$384

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Recent one-way flight deals

 
Only flying one-way? Below are some of the best deals for one-way flights to St. Louis found on KAYAK in the last 72 hours.
12/12Thu
1 stopFrontier
8h 19mSJU-STL
$57
12/11Wed
1 stopFrontier
13h 11mSJU-STL
$64
12/6Fri
2 stopsAmerican Airlines
10h 14mSJU-STL
$127
12/5Thu
2 stopsAmerican Airlines
9h 19mSJU-STL
$130
5/3Sat
1 stopDelta
11h 43mSJU-STL
$147
12/11Wed
1 stop
22h 39mSJU-STL
$149
12/3Tue
1 stopDelta
10h 00mSJU-STL
$166
12/4Wed
1 stop
22h 39mSJU-STL
$168
1/31Fri
1 stopUnited Airlines
10h 38mSJU-STL
$172
12/3Tue
2 stopsUnited Airlines
15h 29mSJU-STL
$211

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Last minute flights to St. Louis

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 to St. Louis that are departing in the next 10 days.
11/9Sat
multi-stopFrontier
25h 56mSJU-STL
11/23Sat
multi-stopFrontier
6h 20mSTL-SJU
$265
11/12Tue
multi-stop
38h 42mSJU-STL
11/15Fri
multi-stop
23h 11mSTL-SJU
$534
11/11Mon
multi-stop
45h 55mSJU-STL
11/15Fri
multi-stop
23h 11mSTL-SJU
$537
11/12Tue
multi-stopSouthwest
11h 20mSJU-STL
11/15Fri
multi-stopSouthwest
12h 05mSTL-SJU
$574
11/12Tue
multi-stop
26h 58mSJU-STL
11/15Fri
multi-stop
20h 29mSTL-SJU
$604
11/12Tue
multi-stopDelta
10h 00mSJU-STL
11/15Fri
multi-stopDelta
9h 13mSTL-SJU
$609
11/9Sat
nonstopSouthwest
5h 10mSJU-STL
11/23Sat
multi-stopSouthwest
12h 00mSTL-SJU
$625
11/9Sat
multi-stopAmerican Airlines
10h 54mSJU-STL
11/23Sat
multi-stopAmerican Airlines
8h 43mSTL-SJU
$627
11/11Mon
multi-stopUnited Airlines
15h 34mSJU-STL
11/15Fri
multi-stopUnited Airlines
10h 46mSTL-SJU
$699
11/8Fri
multi-stopUnited Airlines
12h 14mSJU-STL
11/23Sat
multi-stopUnited Airlines
11h 16mSTL-SJU
$774

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

Information on the airport you'll fly into in St. Louis