BWI - STL

$69 Find Cheap Flights from Baltimore 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 from Baltimore to St. Louis departing on 5/12. 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
1 adult, Economy, 0 bags

KAYAK searches 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 in flight searches from Baltimore 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 in flight searches from Baltimore to St. Louis, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$152
Overall average: $367
Frontier
Tue 4/14Wed 4/15
BWI - STL • 1 stop
Cheapest non-stop
$329
Typical prices: $344-$570
Southwest
Wed 4/8Wed 4/8
BWI - STL • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
BWI's street pricing policy keeps dining costs local.
Use MetroLink from STL for quick city access.
Expert advice
Expert advice
Expert advice
Expert advice
Nonstop flights
You can fly direct with Southwest. Average duration is 2h 24m
Direct flights
Direct flights
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Direct flights
Direct flights
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Top layover airports
Cheapest • Avg $220 (round-trip)
Shortest trip • 4h 44m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 34% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 51% price drop
Most popular
Good to know
Good to know
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Good to know
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Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Expert advice
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Baltimore to St. Louis 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.
Discover the best prices for you by selecting your travel dates on KAYAK.

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

Tue, Apr 14 - Wed, Apr 15
Frontier Logo
5:49 pm - 6:50 am
BWI
-
STL
14h 01m
1 stop
Frontier Logo
8:23 pm - 8:02 am
STL
-
BWI
10h 39m
1 stop
$152Frontier
Tue, Apr 14 - Fri, Apr 17
Frontier Logo
5:49 pm - 6:50 am
BWI
-
STL
14h 01m
1 stop
Frontier Logo
8:23 pm - 4:58 pm
STL
-
BWI
19h 35m
1 stop
$167Frontier
Wed, Apr 22 - Mon, May 18
Frontier Logo
5:49 pm - 10:30 am
BWI
-
STL
17h 41m
1 stop
Frontier Logo
5:27 pm - 7:43 am
STL
-
BWI
13h 16m
1 stop
$169Frontier
Tue, Apr 14 - Wed, Apr 15
Frontier Logo
5:49 pm - 6:50 am
BWI
-
STL
14h 01m
1 stop
Frontier Logo
8:23 pm - 8:21 pm
STL
-
BWI
22h 58m
2 stops
$176Frontier
Thu, May 14 - Sat, May 16
Frontier Logo
3:26 pm - 12:21 am
BWI
-
STL
9h 55m
1 stop
Frontier Logo
4:19 pm - 9:15 am
STL
-
BWI
15h 56m
1 stop
$180Frontier
Sun, Apr 19 - Wed, Apr 22
Frontier Logo
6:05 am - 6:50 am
BWI
-
STL
25h 45m
1 stop
Frontier Logo
8:23 pm - 8:02 am
STL
-
BWI
10h 39m
1 stop
$181Frontier
Sat, May 2 - Sat, May 16
Frontier Logo
5:45 pm - 11:19 pm
BWI
-
STL
6h 34m
1 stop
Frontier Logo
4:19 pm - 9:15 am
STL
-
BWI
15h 56m
1 stop
$191Frontier
Fri, May 1 - Mon, May 4
Frontier Logo
5:35 pm - 11:19 pm
BWI
-
STL
6h 44m
1 stop
Frontier Logo
8:23 pm - 8:12 am
STL
-
BWI
10h 49m
1 stop
$201Frontier
Sat, Apr 11 - Tue, Apr 14
Frontier Logo
5:42 pm - 11:25 pm
BWI
-
STL
6h 43m
1 stop
Frontier Logo
4:59 pm - 4:40 pm
STL
-
BWI
22h 41m
1 stop
$208Frontier
Sat, Apr 11 - Tue, Apr 14
Frontier Logo
5:42 pm - 11:25 pm
BWI
-
STL
6h 43m
1 stop
Frontier Logo
4:59 pm - 4:40 pm
STL
-
BWI
22h 41m
1 stop
$210Frontier
Booking Insights

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

Get data-powered insights and trends into flights from Baltimore to St. Louis 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 Baltimore to St. Louis?

The average price of all round-trip flights from Baltimore to St. Louis clicked on KAYAK for each day over the last 12 months.

For Baltimore to St. Louis, Wednesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from St. Louis back to Baltimore, the best deals are generally found on Wednesday, with Sunday being the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Baltimore 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 from Baltimore to St. Louis is October, where tickets cost $174 (return) on average. On the other hand, the most expensive months are December and November, where the average cost of round-trip tickets is $458 and $443 respectively.

Can I save money by flying with a layover from Baltimore to St. Louis?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $370 on average.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Baltimore to St. Louis, 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 Baltimore to St. Louis, you should book around 3 weeks before departure, which saves you about 34% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 11 weeks before departure.

Expert advice

Expert advice for your flight from Baltimore to St. Louis

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on BWI

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.

Yulia Denisyuk

Yulia Denisyuk

Expert on STL

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.

Good to know

Low seasonJanuary
Cheapest flight$70
Best time to beat the crowds but there is an average 22% increase in price.
Most popular time to fly and prices are also 52% lower on average.
Flight from Baltimore to St. Louis

When to book flights from Baltimore to St. Louis

Are your dates flexible? Find out the best times to travel from Baltimore to St. Louis 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 Baltimore to St. Louis

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

    In the last 3 days, the lowest price for a flight from Baltimore to St. Louis was $66 for a one-way ticket and $152 for a round-trip.

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

    No, a passport isn't needed to fly from Baltimore to St. Louis. However, local authorities might ask for an official ID.

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

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

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

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

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

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the Baltimore to St. Louis flight route.

  • Which airline alliances offer flights from Baltimore to St. Louis?

    oneworld, and SkyTeam are the airline alliances operating flights between Baltimore and St. Louis, with oneworld being the most commonly used for this route.

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

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

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

    The two airlines most popular with KAYAK users for flights from Baltimore to St. Louis are Southwest and Delta. With an average price for the route of $382 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 $240 and an overall rating of 7.9.

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

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Baltimore 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 Baltimore 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 to Baltimore with another airline. Booking your flights between Baltimore and STL 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 Baltimore 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 from Baltimore 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 Baltimore to St. Louis

  • Looking for a cheap flight? 25% of our users found flights on this route for $199 or less one-way and $378 or less round-trip.

Prefer to fly direct from Baltimore to St. Louis?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Baltimore/Washington to Lambert-St Louis.
Find which airlines fly direct from Baltimore/Washington Airport to Lambert-St Louis Airport, which days they fly and book direct flights.

Direct departures

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

Direct returns

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

Reviews of the top 4 airlines serving from Baltimore to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from Baltimore to St. Louis. 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 Baltimore 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
SouthwestOverall score based on 4318 reviews
7.5Entertainment
8.6Crew
8.0Comfort
7.0Food
8.1Boarding
Airline reviews

Long layover between flights to Long Island from BWI - need better coordination between flights

4.0 OkayKenny, Mar 2026
TPA - BWI
Read more Southwest reviews

Long layover between flights to Long Island from BWI - need better coordination between flights

I elected to pay for the upgrades and found very little difference

The new seating arrangement is so over priced for what you get.

It was canceled. Supposedly weather. But there was no snow in Baltimore. At least we found out before driving to airport

I have not flown Southwest in awhile and had a very pleasant experience. From ticketing to boarding to the flight. The flight left on time and landed ahead of schedule. It won't be so long next time!!

Great plane, great attendants,great flight crew,on time. Wonderful flight home..

WIFI was great. My selection for seating is an aisle, but during my trip, I never had an aisle seat. If we can get that corrected, I will be thrilled. No snack or drink on this flight.

Everything went smoothly and we even arrived a little bit early.

The seats were comfortable, and the boarding process was pretty smooth.

The crew canceled the complementary snack and drink in anticipation of turbulence that never materialized. I was counting on the drink (water) to take the the doses of medication - prescribed for my heart condition - that were due during the flight. Since no snack or meal was served on this flight, I cannot rate the food quality. Otherwise, this flight was excellent.

We landed and sat on the tarmac for 45 minutes because they only have one gate at the airport and there was another plane running late so we had to wait

The WiFi was not working. That made for a long flight.

Absolutely no communication on why there's a delay and multiple flight time reschedules. I would have canceled the flight and drove back home if I known it was going to be rescheduled 3 or 4 times.

Another late night flight and MORE men belligerently drinking and yelling. I had to move from first to economy because they were so obnoxious and disruptive. Crazy to go from a cozy chair to cardboard when you were supposed to be in first. Delta allows was too much drinking which leads to belligerent behavior.

I was in first class and literally the men behind me were so aggressively loud I moved myself to economy. This has become so common on Delta - people using audio without headphones, and men on 12am / late night flights drinking and yelling to talk to each other which prevents anyone around them from resting. Pretty crazy to have to move from first to economy (poorer service, less comfort...). Wild wild. Looking into other airlines.

Love delta smaller commuter plane so no entertainment and paid wifi on MKE-LGA leg was extremely unreliable and slow

Stop changing gates. Stop cancelling flights Stop moving my seat.

Extremely disappointed with Delta. They canceled flight last minute and then I rebooked the other flights and with which were delayed as well

Could not get my connecting flight boarding pass until four hrs before departure! Ver annoying especially since the staff could not explain why!

The flight was flying with 30% capacity. The flight my seat from preferred seating to back of the seat. Even though i can understand that this was to balance the flight weight. The flight attendance decided to do the serving near my seat and in the middle , their noices woke me up from sleep , when i realized that the service has ended and when they were going back asked for a coffee, for which they answered they have completed teh service in my location. That really upset me as they woke me up and also rejected the coffee i asked. I ended up landing with a headache, thanks to the crew that screwed up my travel

Easy boarding. Rows are smaller but that may be an older and bigger me now :)

It would have been nice if American tried to care.

American Airlines did everything they could with the high Spring Break crowd. I was frustrated to be changed from 1st class to a middle seat at the back of the plane. This has happened before, not sure booking 1st class and paying the extra actually works.

I booked 1st class, my flights were changed and I was sitting in the middle at the back of the plane. A far cry from the 1st class I purchased for my flights. I am grateful I arrived on time.

There was no beverage service and the only time I saw a crew member walk through the cabin is when we were preparing to land.

Our flight was delayed 3 times and this is why I am giving such low reviews. Everything else was okay but being in the airport at 4:30pm for my initial flight at 7pm to not leave until after 9:30pm is insane,

Flights were constantly delayed. CRW took 50 minutes to get bags

Flight has been delayed every time I've ever taken it. Seats uncomfortable. Children behind me yelling the entire flight. Some of this is out of their control but overall just consistently not a great experience.

Check in was rough because the check in crew did not know how to manage my international visa documents. Required a long process and 4 people to finally be able to proceed to security. They told us incorrect information several times before acknowledging we did indeed have everything we needed from the start.

Where do I start!! I was delayed with my flight from Dallas to Tampa. On the way back from Tampa to Dallas the flight was delayed over 4 hours+. I was put on another flight that was also delayed but not as long. Traveling on American Airlines is becoming exhausing.

There's no seats that lean back with little leg space i wad uncomfortable the entire flight. Your charges for extra baggage is despicable and costly!!

Remind customers of the need to have passport or new ID for boarding.

Flight was canceled. Most upsetting was message from Kayak, stating that the flight was canceled and click with Kayak for details regarding rebook, refund details. THERE'S NO INFORMATION PROVIDED BY KAYAK EXCEPT THAT FLIGHT IS CANCELED. AND NOW THIS SURVEY TO FIND OUT HOW WAS THE FLIGHT !!!!!!!

The flight never took off and we spent 7 hours at the airport

Gate not determined until I got to the airport - hard to plan the trip to the airport.

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

Frontier.. nickel and dime add-ons. Flight late, on time, late again, last minute gate change, arrival gate required a shuttle to the terminal. They sure keep you guessing.. if you like a little chaos and airport anxiety, this is the airline for you!

This is my second time flying with Frontier. My current experience was very favorable. The staff from the gate to the plane was friendly, warm and professional. The food options lacked in my opinion. This area needs some attention in my opinion.

There was no food and no entertainment, so I'm not sure why these are even in the survey, as my understanding is frontier does not ever offer food without a few, not even a snack, and there are no screens so unless the flight safety talk is our entertainment why ask how we liked it?. One of the flight attendants say in the back of the plane as people filed in to their seats, yelling orders about where to put baggage and telling people to hurry up. It was the least professional experience I've ever had on a flight.

Very well recently! Frontier is improving and less harrassing customer on luggages! Positive!

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

Information on your arrival and departure airports