BWI - STL

$72 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 10/18. 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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Everything you should know

Cheapest round-trip
$141
Typical prices: $212-$350
Frontier
Mon 9/14Mon 9/21
BWI - STL • 1 stop
Cheapest non-stop
$297
Typical prices: $297-$473
Southwest
Thu 8/20Mon 8/24
BWI - STL • Non-stop
Nonstop flights
You can fly direct with Southwest. Average duration is 2h 11m
Direct flights
Direct flights
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Direct flights
Direct flights
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Top layover airports
Cheapest • Avg $169 (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 50% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 56% price drop
Most popular
Good to know
Good to know
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Good to know
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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

Mon, Sep 14 - Mon, Sep 21
Frontier Logo
6:00 am - 1:10 pm
BWI
-
STL
8h 10m
1 stop
Frontier Logo
2:29 pm - 9:25 am
STL
-
BWI
17h 56m
1 stop
$141Frontier
Wed, Oct 21 - Mon, Oct 26
Frontier Logo
9:29 pm - 9:40 am
BWI
-
STL
13h 11m
1 stop
Frontier Logo
10:35 am - 6:34 pm
STL
-
BWI
6h 59m
1 stop
$144Frontier
Thu, Oct 15 - Sat, Oct 17
American Airlines Logo
7:17 am - 9:08 pm
BWI
-
STL
14h 51m
1 stop
American Airlines Logo
7:29 am - 5:57 pm
STL
-
BWI
9h 28m
1 stop
$283American Airlines
Tue, Aug 25 - Tue, Sep 1
American Airlines Logo
6:25 pm - 8:24 am
BWI
-
STL
14h 59m
1 stop
American Airlines Logo
6:00 am - 9:59 pm
STL
-
BWI
14h 59m
1 stop
$283American Airlines
Tue, Oct 13 - Tue, Oct 13
Southwest Logo
7:30 am - 10:20 am
BWI
-
STL
3h 50m
1 stop
Southwest Logo
3:00 pm - 9:40 pm
STL
-
BWI
5h 40m
1 stop
$290Southwest
Thu, Oct 8 - Thu, Oct 8
Southwest Logo
9:00 am - 12:15 pm
BWI
-
STL
4h 15m
1 stop
Southwest Logo
7:50 pm - 12:45 am
STL
-
BWI
3h 55m
1 stop
$290Southwest
Mon, Oct 26 - Mon, Oct 26
Delta Logo
6:00 am - 10:51 am
BWI
-
STL
5h 51m
1 stop
Delta Logo
7:20 pm - 12:51 am
STL
-
BWI
4h 31m
1 stop
$295Delta
Sat, Oct 24 - Sat, Oct 24
Delta Logo
6:10 am - 9:44 am
BWI
-
STL
4h 34m
1 stop
Delta Logo
5:38 pm - 11:28 pm
STL
-
BWI
4h 50m
1 stop
$295Delta
Sat, Aug 22 - Sun, Aug 23
United Airlines Logo
8:10 am - 2:57 pm
BWI
-
STL
7h 47m
1 stop
United Airlines Logo
5:30 pm - 11:00 pm
STL
-
BWI
4h 30m
1 stop
$346United Airlines
Thu, Aug 27 - Thu, Aug 27
United Airlines Logo
6:05 am - 10:12 am
BWI
-
STL
5h 07m
1 stop
United Airlines Logo
5:30 pm - 11:00 pm
STL
-
BWI
4h 30m
1 stop
$375United Airlines
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 September.

Flight prices are below average for this route right now.

Flights to St. Louis from Baltimore usually cost between $289 and $473 in September.
The lowest price found in the past 5 days was $141 on Frontier (Sep 14-Sep 21).

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 Tuesday is the most expensive. Flying from St. Louis back to Baltimore, the best deals are generally found on Thursday, 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 June and December, where the average cost of round-trip tickets is $513 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 50% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 7 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 season

January

Cheapest flight

$72
Best time to beat the crowds but there is an average 10% increase in price.
Most popular time to fly and prices are also 57% 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 $72 for a one-way ticket and $141 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 $443 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 $307 and an overall rating of 7.8.

  • 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 $298 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 4229 reviews
7.5Entertainment
8.1Boarding
8.6Crew
7.0Food
8.0Comfort
Airline reviews

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.

2.0 MediocreStuart, Mar 2026
HOU - STL
Read more Southwest reviews

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.

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!!

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

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

Southwest's seats are the least comfortable I have ever sat in.

For my birthday trip this was my second time ever flying, this trip was the best.

Crew was great flight was great baggage claim was a failure. It took over 1 hour for bags to arrive. Poor communication poor effort when I spoke to the supervisor about the delay

Everything was great except the food. The pretzels are really crappy.

I had a front row middle. I am not a big person and I barely fit in between that seat! No place to put my arms, even though the guys on each side were not taking over the arm rests. It felt like a frontier flight (if that tells you everything )

Overall is was a pretty good flight. However we were 15 mins late taking off and no one told us anything. We were all in our seats just sitting there for 15mins and all the sudden the pilot stayed we are leaving now. I think they should have at least said something after our take off time passed. Everyone was wondering what was going on. I will say the pilot did increase the speed of the plane so we arrived in time. So we weren't late.

We departed early and made up time in the air allowing us to arrive 30 minutes early. Capt was incredibly genuine and thanked every passenger for flying with Delta. Completely humble and professional!

The boarding process needs to be refined. Sometimes the gate crew calls out the zones and then flip to showing the.zones boarding on the gate monitor display. So, unless you are huddled around the gate lanes watching the monitor, you could miss your boarding zone. Suggest the zones be announced each time a new zone is allowed to board.

This route with Delta always has delays or is cancelled. Aircrafts seem smaller and older. I fly Delta quite a bit - haven’t had issues with the international flights. But this route has always been the troublesome one

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

On 2 different flights the wifi was horrible and there was no drink or snack service.

There was no FREE wi-fi nor entertainment screens at all.

Great, on time departure, friendly and accommodating crew, great leg room, Smith flight

My sister and I paid to have our seats and have them next to each other. I heard one of the employees say to the other one that you shouldn’t have given away reserved seats away to other passengers, and so I guess that is what happened because I got the last most uncomfortable seat in the plane even though I paid to sit in the middle of the plane with my sister. Terrible Experience !!

We checked one bag. That was fast and the agent was fast and super nice. At the gate, boarding was fast and efficient. Flight was uneventful which was great because it was early in the morning and most folks were sleeping. Landing was great. Delta does a really good job of making the flying experience better all around considering you are sitting in such a small space on a plane for several hours.

As we lined up to board they gave our plane to a flight going to Newark. So then we got delayed until they could find another plane. Flight crew was ok. I’m assuming since it’s a shorter flight they only offered water and coffee.

We called Kayak for a change due to the TSA situation in Atlanta. What we got was a canceled return flight (in error) and we had to find the mistake. Not happy with Kayak who blamed it on AA.

Small plane, poor meal choices for first class, bad terminal and boarding experience at LAX

Boarding delayed 20 minutes for no reason, no wifi, in flight entertainment, or snacks / waters?

This flight captain and crew were amazing, started ahead of time of departure and reached 30 mins before arrival time. Amazing!

Improvements in communication and empathy are absolutely necessary for American Airlines staff (top down). It’s like they are numb to the needs of their customers.

I like the speed of boarding and deplaning and the fact that everything was on time. The crew (attendants) were probably quite new and did not begin the in cabin service until 30 min before landing even though there was little to no air turbulence for the last 1.5 hours of the flight. It made for a mad scramble at the end to get trash collected and carts stowed before touch down.

The flights was delayed by hours and it was the firmest landing I have experienced in my life. My back is still sore.

I did like the employee's, they are very friendly and all smiled most of the time, Overall, from checking in bags to getting on plane, not enough employees to be able to get all on the plane, therefore I was not able to get on the plane, due to no one wea there for me to check in my bag, so I decided to go thru the security point and by the time they were done with my bags, I was told that my bag cannot be checked in, and then found out that the lady that does the check in was boarding the customers onto the plane, she said that she was going back and fourth, there for was not able to get on the plane, which changed all my flights by the time I got to Dallas, I was on standby 3 times, and wasn't sure about being able to get on the fourth plane, so ended up buying another plane ticket, so I could make my destination on time.

Not sure about entertainment as I didn't use any, so maybe there should be an NA option on this survey. Otherwise everything was just as it should be. Of course I wish planes were more comfortable and had seats that would tilt back further.

American Airlines “Randy” questioned why I needed preboarding and denied my request for same. Then Randy attempted to berate me when I boarded with my group. I was seated in an exit roll with a young man with a disability that exhibited difficulty controlling and settling himself. But Tandy questioned my disability. The flight was horrible. It was overpacked.

Great except upon arrival it took them a long time to open the doors

Terrible. Delayed my family flight for several hours affecting family plans

Flight was delayed and then my second leg was completely canceled. Had to get a refund

Boarding was on time and plane departed as scheduled. There are obviously no amenities (food, drink, entertainment) on Frontier, but there also didn't seem to be any issues with luggage space either.

The single worst check in experience I could imagine. I’ll never do any business with Frontier or any affiliated company

Six hour delay. Poor customer service. No voucher. Bad communication. Missed important appointments.

First time flying Frontier, I am not sure the Ala Carte menu of options is for me.

Flying frontier reminded me of flying with my family in the 80’s in all of the worst ways possible. From poor customer service to little to no technology. The plane was dirty old and also stuck in the 80’s. From their seatbelts to not having anywhere to charge our phones the seats and the equipment I wasn’t sure if I was being punked or thrown back in time. Needless to say I don’t see myself flying frontier ever again.

The experience was terrible. The flight boarded late, then after leaving the gate the plane had had to return to the gate for fuel. After 2 hours on the plane, the flight was canceled. The reasons given for the cancelation didn't sound truthful. and different reasons were given. My 15 year old daughter was flying alone on this flight. When they all disembarked the plane she kept asking the crew what she was supposed to do. No one even gave her the courtesy of a response. No one. It took another 4.75 hrs to be out of customs and baggage. She was re-booked the following day. That flight departed 2 hours late. After all of that, they offered a measly $100 flight voucher with an expiry date of 3 months! All in all a terrible experience. We won't be using Frontier again in the future.

Beware that when flying into Atlanta with Frontier, you will wait for your checked bag for a full hour after arriving at the gate! Do NOT recommend Frontier if Atlanta is your final destination!

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

Information on your arrival and departure airports