BWI - STL

$71 Find Cheap Flights from Baltimore to St. Louis - Compare and Save

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 8/11. 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
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
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Everything you should know

Cheapest round-trip
$144
Typical prices: $569-$383
Frontier
Tue 7/7Tue 7/14
BWI - STL • 1 stop
Cheapest non-stop
$251
Typical prices: $589-$375
Southwest
Wed 11/4Tue 11/10
BWI - STL • Non-stop
Nonstop flights
You can fly direct with Southwest. Average duration is 2h 15m
Direct flights
Direct flights
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Direct flights
Direct flights
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Top layover airports
Cheapest • Avg $146 (round-trip)
Shortest trip • 4h 22m (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 36% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 55% price drop
Most popular
Good to know
Good to know
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We hope you love your trip to St. Louis!
Flight Deals
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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, Jul 7 - Tue, Jul 14
Frontier Logo
8:36 am - 5:37 pm
BWI
-
STL
10h 01m
1 stop
Frontier Logo
6:34 pm - 7:26 am
STL
-
BWI
11h 52m
1 stop
$144Frontier
Tue, Jul 7 - Mon, Jul 13
Frontier Logo
6:35 am - 5:37 pm
BWI
-
STL
12h 02m
1 stop
Frontier Logo
4:57 pm - 3:34 pm
STL
-
BWI
21h 37m
1 stop
$147Frontier
Fri, Jul 3 - Mon, Jul 6
Frontier Logo
9:32 pm - 8:52 am
BWI
-
STL
12h 20m
1 stop
Frontier Logo
4:57 pm - 7:26 am
STL
-
BWI
13h 29m
1 stop
$158Frontier
Tue, Jul 14 - Fri, Jul 17
Frontier Logo
8:36 am - 5:37 pm
BWI
-
STL
10h 01m
1 stop
Frontier Logo
4:57 pm - 3:34 pm
STL
-
BWI
21h 37m
1 stop
$159Frontier
Tue, Aug 25 - Fri, Aug 28
Frontier Logo
6:35 am - 5:30 pm
BWI
-
STL
11h 55m
1 stop
Frontier Logo
5:33 pm - 7:45 am
STL
-
BWI
13h 12m
1 stop
$160Frontier
Thu, Aug 6 - Mon, Aug 10
Frontier Logo
7:07 pm - 8:57 am
BWI
-
STL
14h 50m
1 stop
Frontier Logo
4:57 pm - 7:26 am
STL
-
BWI
13h 29m
1 stop
$161Frontier
Wed, Sep 16 - Sun, Sep 20
Frontier Logo
9:20 pm - 9:40 am
BWI
-
STL
13h 20m
1 stop
Frontier Logo
10:35 am - 8:29 am
STL
-
BWI
20h 54m
1 stop
$162Frontier
Thu, Aug 6 - Mon, Aug 10
Frontier Logo
6:35 am - 5:37 pm
BWI
-
STL
12h 02m
1 stop
Frontier Logo
4:57 pm - 7:26 am
STL
-
BWI
13h 29m
1 stop
$163Frontier
Thu, Aug 6 - Mon, Aug 10
Frontier Logo
6:35 am - 5:37 pm
BWI
-
STL
12h 02m
1 stop
Frontier Logo
4:57 pm - 7:26 am
STL
-
BWI
13h 29m
1 stop
$164Frontier
Tue, Sep 8 - Mon, Sep 14
Frontier Logo
8:52 am - 9:40 am
BWI
-
STL
25h 48m
1 stop
Frontier Logo
10:35 am - 6:36 pm
STL
-
BWI
7h 01m
1 stop
$165Frontier
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.

How much is a round-trip flight from Baltimore to St. Louis?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Baltimore to St. Louis departing in July.

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 Monday is the most expensive. Flying from St. Louis back to Baltimore, the best deals are generally found on Tuesday, with Monday 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 June and December, where the average cost of round-trip tickets is $532 and $458 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.

No, with an average price for the route of $416, prices are generally cheapest when you fly direct.

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 36% 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$71
Best time to beat the crowds but there is an average 12% increase in price.
Most popular time to fly and prices are also 56% 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 5 days, the lowest price for a flight from Baltimore to St. Louis was $71 for a one-way ticket and $144 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?

    American Airlines, Alaska 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 $429 and an overall rating of 7.9, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $292 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 $186 or less one-way and $396 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.
7.9
SouthwestOverall score based on 4235 reviews
8.6Crew
7.5Entertainment
8.0Comfort
7.0Food
8.1Boarding
Airline reviews

Airline is not very senior friendly. Flights are late, forcing us to run to the connecting flight. Food is awful. Wish they would go back to pretzels and peanuts. During flight, pressurization isn’t quite right and all of our ears get plugged. Everything is nickel and dime, charging for boarding, seat selection and legroom. While a screen at the desk in the gate area says check your roll on bag now for free due to space limitation, the employee at the desk will not check the bag without a $100 fee. Insane.

2.0 MediocreAngie, Jun 2026
CLE - DEN
Read more Southwest reviews

Airline is not very senior friendly. Flights are late, forcing us to run to the connecting flight. Food is awful. Wish they would go back to pretzels and peanuts. During flight, pressurization isn’t quite right and all of our ears get plugged. Everything is nickel and dime, charging for boarding, seat selection and legroom. While a screen at the desk in the gate area says check your roll on bag now for free due to space limitation, the employee at the desk will not check the bag without a $100 fee. Insane.

Kayak could’ve posted the correct gate number. Almost missed my flight.

Slow boarding, limited food and drink portions. Bad delays and turbulence

The entire travel day was a disaster from beginning to end. Woke up at two in the morning to make it to San Juan airport in time for a 5:30 am flight to Milwaukee which connected in Baltimore. Massive delays lead to me missing original connection out of Baltimore. Sixteen hours of delays/rebooking/layover time later, arrived in Milwaukee to find that only one of two checked bags made it there (despite the fact that Southwest brought another 737 jet to San Juan to fly us out to our original Baltimore connection—-not squeezed into another booked flight). The flight from Baltimore to Milwaukee was barely half full, so there was no logical reason to ship my bags out of Baltimore on a different flight to Chicago to then ship to Milwaukee. Southwest decided that my bags should not have been on the same connecting flight I WAS ON to Milwaukee, and then proceeded to accidentally leave my larger bag with the important items in Chicago. Terrible logic and support all around. Extremely angered and disappointed with SW. What a clownish operation your company has become!

Communication about the delayed flight was poor. We were told to move gates three times but that was bad information. We went from gate 128 to gate 126 and then to gate 123 and back to gate 126. Communication about the delay was bad. Ended up being 1 1/2 hour late getting home.

Love them will get a Southwest card to track my points and keep flying with them. My family and I were pleased with the services.

I have roller bag with food and medication told me I couldn't bring on my 2nd flight today. 15 years flying with SW never an issue with that bag.

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..

Should never have had to go to Detroit from Orlando back to Tennessee!

Got rerouted from a straight flight from Orlando to Atlanta to Knoxville to a flight from Orlando to Detroit to Knoxville! Seriously!! Flight delay out of Detroit! Long day for what should have been a pretty easy travel day!

Two delays on two separate planes with parts they could not easily find and replace.

Checkin was good, fllight ws good. Onlly complaint is lack of foot on 6 hour flight from Seattle to Boston. Snacks were flimsy - chips and cookies. could have offered something more substantial for such a long flight. I know you can buy food in airport but for the price you pay for a ticket, they should step up for the passengers.

Only beverages were offered to first class and I thought the flight attendant could have also served the Delta Comfort as well instead of sitting down and staring at her phone and walking past all of us to the back of the plane to charge her phone more. There was a complete lack of turbulence and was safe enough for flights attendant to walk around in the front of the plane, collect trash and serve a few people water and turn off the seat belt light. Also didn’t enforce people putting their seats into the upright position and allowed two passengers to remain reclined during landing. They seemed out to lunch completely. Usually my experience on Delta is much better.

Long story short, it was one of the better flight experiences I've had in some time when compared with other airlines.

Flight was great! This flight from Atlanta was even better than when I paid for Comfort from SNA to Atlanta.

Connection flights should be spaced out farther because too close I missed my connection.

Definitely a southern flavor. Cordiality was evident even though no drinks or snacks were served.

On time! There were plenty of airport employees who were able to keep us moving in the right direction. The crew on the plane were professional.

Leave on time. We waited on the plane for hour hours and it was hot and smelly

Two hours delay, probably one hour because they didn’t bring catering and they had to bring water in board. There a change of aircraft. But delays galore at CLT so it must be a CLT and/or AA operation issue. The 1 hr additional delays because nobody could bring 2 packs of water sooner is probably the best example of this airline operates

Flight was delayed 5 hours. Initial reason for delay was 'maintenance' - which makes sense. Then, the additional 2 hours continued to say it was maintenance - when I know EWR had a 2 hour delay. AA did not say that. Additionally, when boarding, there was only one agent at the counter for a long time - until another came to help. After boarding, we had to wait another 45 minutes due to 'no catering'. So while we waited for catering, AA continued to board additional passengers - which seemed odd - and raised questions about what really was going on. I sat in First Class. During the flight, the flight crew allowed a significant number of non-First Class passengers to use the front bathroom - which created a very crowded environment in First Class which was uncomfortable. This also delayed First Class passengers from using the bathroom. Overall, horrible experience.

The Charleston, WV airport was cute. Very good staff and small enough to feel comfortable. The plane had more leg room than bigger planes. Much more comfortable.

Another uncoordinated American experience. Always surprises me at DFW for them of all places. Have to take this flight as there are no other good time options. We knew from the start that something was wrong, but the pilot wouldn't tell us. I just watched my Kayak app grow the delay by 10 minutes as it went to 3.5 hours. They were uncoordinated with maintenance (as maintenance, when finally arriving, knew within 15 minutes the plane wasn't going. No 'sorry' or 'this is what is going on' comment. The pilot seemed unfazed / didn't care about the process we were going through.

The seats. The seat in front of me was awful and when the guy sat down, it flew back and hit my head when I was putting my backpack under the seat, It didn't make for a pleasant experience,

I’ve got 31F seat and window seat . My 2 co passengers was AA crew members and they were very rude attitude and when I was going to use bathroom their gestures was very different and awkward and the guy beside me completely occupied the hand rest and I was really uncomfortable

The gate experience at LAX was abysmal (same for the arrival experience two days prior). Despite the LAX -> SAT schedule of two flights daily, our departure gate was at a smaller hub that we had to be bussed to from Terminal 4. Fortunately, I arrived at LAX extra early and had time to spare, but if I had not known, I might have missed my flight. I looked at the LAX airport map in the AA app and there was no indication of the additional boarding process. Lastly the gate area we were bussed to was crowded with limited food and beverage options. On flight, the fight attendant was hospitable and attentive, the flight was smooth, and AA's free (and working) wifi for AA members were all on the positive side.

It was so much better than expected, Ohare is not such a pleasant experience but American Airlines with the new, clean aeroplane and free Wi-Fi was outstanding and the crew so pleasant and helpful.

The flight attendants were extremely sourly and borderline rude. I did not feel appreciated as an AA customer once.

There weren't enough employees at check in took awhile to get bags checked. There wasn't a wheel chair for me, I was sent to someone who turns out to work for a different airline, if My flight hadn't been delayed I probably would have missed my flight as it was, by the time I arrived at my gate, they started boarding in about 15 minutes. I don't know who took me to my gate, definitely was not the normal people who take passengers to the gate. I'm guessing she may have been in a management position. I wish I knew her name, she went beyond to help me. With that said everyone was kind, and were doing the best they could. So, I choose to say it was an Adventure, stressful start, but good. In the end went well. The situation was not only difficult for passengers but the employee's.

The staff at the check in counter was so rude. Made you feel Incompetent

Frontier scheduled a 40 minute connection in DEN. What they failed to mention was that they “close the doors” 20 mins prior to departure, which means you only have 20 mins. Not enough time. Possibly against DOT regulations. Filing complaint.

Flight was scheduled at 9:40pm. Got delayed to 10 am, the next day. crazy

The bag check, flight check-in, and onboard experience convinced my wife and me that we will actively go out of our way to avoid flying Frontier Airlines in the future. At bag check, we were informed that check-in could only be completed via the Frontier mobile app. Unfortunately, the app was extremely frustrating—sending us through repetitive, confusing loops that repeatedly forced us to decline add-on services with nearly every click. While most airline apps upsell, this one felt intentionally exhausting. As the process dragged on, we became genuinely concerned that my phone battery would die before check-in could be completed. We approached the bag check staff—who were standing together talking—and explained both our frustration and our predicament. They laughed. Later, my wife described the interaction as “gaslighting,” which felt accurate. We were then informed it would cost $25 per person simply to have our boarding passes printed. From that point forward, the tone of the experience was consistently hostile. The bag check employees were condescending and combative, behaving more like bullies than customer service staff. Unfortunately, that same attitude continued onboard. One flight attendant argued with me when I attempted to stow my backpack in the overhead bin. I explained that we had each paid $75 to check our bags specifically so we would not need to use carry-on space and could have adequate legroom. She demanded to see my ticket, pointed out that it said “no carry-on”—which I acknowledged—and I reiterated that this was precisely why we paid to check our bags. Her response was, “I don’t make the rules.” She then walked away, but not before asking if I “truly wanted to fly back to Chicago today?”—an unnecessary and unmistakable threat. It is also worth noting that despite booking our tickets together in the same transaction, we were not seated together. Upon our return to Chicago—where we could once again sit together—we compared onboard experiences. We both remarked on how unhappy the flight attendants appeared and how each of us was separately asked whether we would like to purchase a beverage. We declined. At no point was water mentioned as an option, leaving us with the clear impression that even water came at a cost—or that complimentary water, if available at all, was deliberately left unmentioned. Overall, the experience was shocking and deeply disappointing, but it was also a profound learning experience—one we will not forget and will not repeat. -Steve

Plane was hot and miserable and the crew was rude!

12 hour delay required getting on and off plane 3 times - would have at least liked to have been offered a snack or drink

They didn’t offer a water, even after I asked

They switched our terminal 3 times and we were delayed for four plus hours!!!

It was an early flight and most people napped/slept and the crew let us which was nice.

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

Information on your arrival and departure airports