STL - BWI

$65 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 6/23. 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 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
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
$124
Typical prices: $476-$320
Frontier
Tue 5/26Tue 6/2
STL - BWI • 1 stop
Cheapest non-stop
$342
Typical prices: $467-$296
Southwest
Tue 5/26Sat 5/30
STL - BWI • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Avoid peak hours at STL for faster baggage claim.
Use the light rail from BWI to reach downtown Baltimore.
Expert advice
Expert advice
Expert advice
Expert advice
Nonstop flights
You can fly direct with Southwest. Average duration is 2h 03m
Direct flights
Direct flights
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Direct flights
Direct flights
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Top layover airports
Cheapest • Avg $231 (round-trip)
Shortest trip • 4h 17m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 36% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 36% 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 Baltimore!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights 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.
Discover the best prices for you by selecting your travel dates on KAYAK.

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

Tue, May 26 - Tue, Jun 2
Frontier Logo
6:33 pm - 7:43 am
STL
-
BWI
12h 10m
1 stop
Frontier Logo
8:52 am - 5:33 pm
BWI
-
STL
9h 41m
1 stop
$124Frontier
Tue, May 26 - Tue, Jun 2
Frontier Logo
6:33 pm - 7:43 am
STL
-
BWI
12h 10m
1 stop
Frontier Logo
8:52 am - 5:33 pm
BWI
-
STL
9h 41m
1 stop
$126Frontier
Wed, Jun 3 - Sun, Jun 7
Frontier Logo
5:27 pm - 7:43 am
STL
-
BWI
13h 16m
1 stop
Frontier Logo
9:43 pm - 8:55 am
BWI
-
STL
12h 12m
1 stop
$127Frontier
Tue, May 26 - Fri, Jun 5
Frontier Logo
6:33 pm - 7:43 am
STL
-
BWI
12h 10m
1 stop
Frontier Logo
9:23 pm - 8:55 am
BWI
-
STL
12h 32m
1 stop
$129Frontier
Mon, Jun 1 - Mon, Jun 8
Frontier Logo
5:27 pm - 7:43 am
STL
-
BWI
13h 16m
1 stop
Frontier Logo
9:23 pm - 5:30 pm
BWI
-
STL
21h 07m
1 stop
$130Frontier
Mon, Jun 1 - Thu, Jun 4
Frontier Logo
5:27 pm - 7:43 am
STL
-
BWI
13h 16m
1 stop
Frontier Logo
8:52 am - 5:33 pm
BWI
-
STL
9h 41m
1 stop
$133Frontier
Thu, May 28 - Sun, May 31
Frontier Logo
6:33 pm - 7:43 am
STL
-
BWI
12h 10m
1 stop
Frontier Logo
9:43 pm - 8:55 am
BWI
-
STL
12h 12m
1 stop
$136Frontier
Tue, May 26 - Tue, Jun 2
Frontier Logo
6:33 pm - 7:43 am
STL
-
BWI
12h 10m
1 stop
Frontier Logo
8:52 am - 5:33 pm
BWI
-
STL
9h 41m
1 stop
$137Frontier
Tue, Jun 2 - Mon, Jun 8
Frontier Logo
6:33 pm - 4:22 pm
STL
-
BWI
20h 49m
1 stop
Frontier Logo
9:23 pm - 5:30 pm
BWI
-
STL
21h 07m
1 stop
$138Frontier
Sat, May 23 - Tue, May 26
Frontier Logo
5:27 pm - 12:15 pm
STL
-
BWI
17h 48m
2 stops
Frontier Logo
9:13 pm - 8:55 am
BWI
-
STL
12h 42m
1 stop
$160Frontier
Booking Insights

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.

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

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

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 Wednesday and avoid Mondays if you are looking for the best rates. For your return to St. Louis, you’ll find the best rates on Wednesdays and the most expensive ones on Mondays.

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 $239 (return) on average. On the other hand, the most expensive months are February and March, where the average cost of round-trip tickets is $493 and $422 respectively.

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

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 $350 on average.

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 4 weeks before departure, which saves you about 36% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

Expert advice

Expert advice for your flight from St. Louis to Baltimore

 
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$65
Best time to beat the crowds but there is an average 8% increase in price.
Most popular time to fly and prices are also 16% lower on average.
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 $65 for a one-way ticket and $124 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, Delta, and JetBlue 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 MAX 8 is the aircraft model that flies most regularly on the St. Louis to Baltimore flight route.

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

    SkyTeam, and oneworld are the airline alliances operating flights between St. Louis and Baltimore, with SkyTeam being the most commonly used for this 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 $400 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 $302 and an overall rating of 7.9.

  • 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 $244 or less one-way and $351 or less round-trip.

Prefer to fly direct from St. Louis to Baltimore?

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

Reviews of the top 4 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 4314 reviews
8.6Crew
8.1Boarding
7.0Food
7.5Entertainment
8.0Comfort
Airline reviews

Terrible all around. Left prior review detailing massive delay/cancellation to then rebook travel. Topping on the cake was lost luggage even after travel to ultimate destination was secured on a new plane(s).

2.0 MediocreAnonymous, Apr 2026
SJU - BWI
Read more Southwest reviews

Terrible all around. Left prior review detailing massive delay/cancellation to then rebook travel. Topping on the cake was lost luggage even after travel to ultimate destination was secured on a new plane(s).

The flight was okay. The pilots did an amazing job and kept us updated on the flight. The flight attendants were okay. They found time to be chatty with each other rather than focus on the guests. One of the attendants was a little less warm when asking about my bag I had on my lap that I was using during latter part of the mid- flight. Mind you, it was not the departure descent. I’m respectful to each and every attendant, it was the tone in her voice reminding me to place my carryon bag on the floor. I hope to have a better experience next time.

I am very please with the service received from Southwest. Although there was a refuel stop in Fl before we got the Baltimore. The service and kindness of the staff was excellent.

Southwest continues to do less for more money. Flight attendants used to be fun and friendly. But now it’s like they don’t even see you. Such a shame.

I liked it better when you were truer to your roots Am paying more for less fun

We had a 5 hour delay on the tarmac in Baltimore

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

Snacks are always pretzels. Why can't you also offer peanuts ?

The last 3 flights between BWI and BDL canceled the beverage service mid- way. Just say up front that the fight is too short. Thanks!

Only downside was the legroom and seat width, which is always a problem unless I spend more for a premium seat.

The agent at check in and at the gate were less than thrilled to be at work. I'm not a fan of Kayak's placement on the plane. I got put in the middle seat and none of my preferences were used.

In ATL they have two sets of departure screens. Follow what is on your airline's departure board - the ATL Airport Authority departure board had completely incorrect details about the gate assignment for my flight, which would have made me miss boarding.

Flight was delayed it was hot while sitting on the plane, one engine was working on the plane until they had to do some jimmy rigging down the runway in order for the other engine to charge up. It was ridiculous

The flight was very good and the staff was very friendly and helpful!

The only thing I would say is we tried to get on a standby earlier flight, but with our fair we couldn’t. That seems senseless to leave with open seats..

Very easy to use and convenient, you can perform any action within the same portal

In a world of delays, Delta was on time both ways! Boarding was fast and efficient. Staff was friendly. AND wifi worked.

WiFi didn’t work. Flight delayed 3 hours Crew members were illiterate Seat lean back did not work.

Flight was delayed, we could have been notified earlier and in a consistent manner. App was not refreshing for another passenger to get the latest flight status. We could have stayed and waited at the hotel instead of waiting at the airport had we known the flight was going to delayed for more than 5 hours. The toilet is too tight, and needs to be cleaned more frequently (every hour). The entertainment screen froze, the touch screen not responding to touch. We were upgraded to comfort, it is more comfortable than regular economy seats.

This wasn't my experience with Delta. It was just the Pegasus flight. Seats were very hard. Staff was kinda rough. Not very nice. Charged me for snacks. For a 4 hour flight I would've expected more.

I would like a refund for the extra cost the seat I paid for. An oversized person sat next to me and I couldn’t fit on my seat and had to move to another seat.

Boarding gate at LAX was too crowded—two gates next to one another

The flight was delayed about an hour for a maintenance specialist to approve the maintenance repair

This flight was delayed but it worked in my favor because my Atlanta to Dallas flight was delayed.

This was a hard flight. 3 delays out of OKC (1 on the Tarmac). Delay in Atlanta coming to Dallas. total travel time was the equivalent of driving from OKC to Atlanta.

Like: flights are on time, good boarding process Can improve: planes are old, improve entertainment and make space more comfortable

Had to wait for a gate for a long time, then waited on the run way for a long time before leaving. The actual flights part was good.

The airplane was an old model, the overhead didn’t have enough room for people’s items and made boarding and boarding disappointing and stressful. Crew allowed passengers to bring more than the permitted baggage sizes.

Flying in the United States with the major airlines has become so underwhelming. A 2-3hr flight in most other parts of the world with the major carriers of the area comes with newer, CLEANER aircraft and significantly better in flight service in terms of both staff attitude and a actual meal service.

On time departure and early arrival. Flight attendant very nice.

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.

The crew acted like they had never done this and kept barking passive aggressive orders at people. + the security line + the delay + sitting on the tarmac for 2 hours + none of the apps or signage updating with correct times

More inflight connection. And leg space is horrible. And the paying for baggage I'd ridiculous!!!

My flight was originally from SAT to MCO connecting from MCO to ORD. We got diverted to ATL and than Frontier staff there was sooo un helpful first they said they couldn’t give us any accommodation since our flight first got delayed that cancelled and now it’s 221am and I am still in ATL since they said they need to create a new flight my final destination is ORD and I have been delayed twice and cancelled. With no real help the frontier app didn’t work no email updates over all such a horrible experience

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.

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

Information on your arrival and departure airports