$56+ Cheap flights from Baltimore to St. Louis (BWI - STL)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/29. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — STL
Oct 1 — Oct 81
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Baltimore to St. Louis with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Baltimore/Washington to Lambert-St Louis are usually found in October or February, booked 27 days in advance, depart on a Wednesday or Friday and return on a Thursday
Cheap flight deals from Baltimore to St. Louis
Cheapest
Best
Last-minute
One-way
Cheapest flights from Baltimore to St. LouisExplore the most affordable flight options available from Baltimore to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 1, 2026.
Explore the most affordable flight options available from Baltimore to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 1, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/299:25 pm -
1 stop16h 45m
Wed 10/72:29 pm -
1 stop6h 29m
Deal found 8/29![Frontier logo]()
$114
This Kiwi.com deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:38 am -
1 stop7h 32m
Mon 10/52:29 pm -
1 stop25h 17m
Deal found 8/29![Frontier logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:38 am -
1 stop7h 32m
Wed 10/146:35 pm -
1 stop13h 52m
Deal found 8/29![Frontier logo]()
$122
This Kiwi.com deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:00 am -
1 stop8h 10m
Wed 9/232:29 pm -
1 stop6h 01m
Deal found 8/27![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/19:25 pm -
1 stop16h 45m
Mon 10/52:29 pm -
1 stop25h 17m
Deal found 8/28![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/229:25 pm -
1 stop16h 45m
Fri 9/252:29 pm -
1 stop17h 56m
Deal found 8/27![Frontier logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2810:45 am -
1 stop7h 55m
Mon 11/26:44 pm -
1 stop20h 30m
Deal found 8/29![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/26:00 am -
1 stop8h 10m
Mon 10/52:29 pm -
1 stop17h 56m
Deal found 8/27![Frontier logo]()
$149
Best flights from Baltimore to St. LouisDiscover carefully curated flight deals from Baltimore to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 1, 2026.
Discover carefully curated flight deals from Baltimore to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 1, 2026.
This Southwest deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/176:30 am -
Nonstop2h 10m
Tue 10/208:30 am -
1 stop3h 40m
Deal found 8/26![Southwest logo]()
$302
This Delta deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/277:00 am -
1 stop7h 20m
Thu 10/296:00 am -
1 stop6h 06m
Deal found 8/27![Delta logo]()
$325
This Southwest deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:00 pm -
1 stop4h 00m
Mon 10/55:40 pm -
Nonstop2h 00m
Deal found 8/30![Southwest logo]()
$311
This Delta deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/206:10 am -
1 stop4h 19m
Tue 9/2210:05 am -
1 stop4h 35m
Deal found 8/29![Delta logo]()
$351
This Southwest deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/237:55 pm -
Nonstop2h 20m
Fri 9/254:15 pm -
Nonstop2h 00m
Deal found 8/28![Southwest logo]()
$347
This Southwest deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2610:05 am -
Nonstop2h 20m
Fri 11/278:25 pm -
Nonstop1h 55m
Deal found 8/26![Southwest logo]()
$353
This Southwest deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/57:40 pm -
Nonstop2h 20m
Sun 11/86:40 am -
Nonstop1h 55m
Deal found 8/26![Southwest logo]()
$362
This Southwest deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/910:00 pm -
Nonstop2h 20m
Sun 10/118:25 am -
1 stop5h 20m
Deal found 8/29![Southwest logo]()
$377
This Southwest deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/187:30 am -
1 stop5h 30m
Mon 9/216:50 pm -
Nonstop2h 05m
Deal found 8/28![Southwest logo]()
$377
This Southwest deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/225:35 pm -
2 stops5h 40m
Fri 9/255:40 pm -
1 stop4h 00m
Deal found 8/28![Southwest logo]()
$392
Last-minute flights from Baltimore to St. LouisDiscover last-minute flight deals from Baltimore to St. Louis. Data last updated September 1, 2026 and is based on user searches.
Discover last-minute flight deals from Baltimore to St. Louis. Data last updated September 1, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2010:22 am -
1 stop27h 48m
Wed 9/232:29 pm -
1 stop6h 01m
Deal found 8/26![Frontier logo]()
$167
This Kiwi.com deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:00 am -
1 stop8h 10m
Wed 9/232:29 pm -
1 stop6h 01m
Deal found 8/27![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/229:25 pm -
1 stop16h 45m
Fri 9/252:29 pm -
1 stop17h 56m
Deal found 8/27![Frontier logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/236:38 am -
1 stop7h 32m
Mon 9/282:29 pm -
1 stop17h 56m
Deal found 8/29![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/286:00 am -
1 stop8h 10m
Wed 10/72:29 pm -
1 stop6h 29m
Deal found 8/29![Frontier logo]()
$158
This Kiwi.com deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/286:00 am -
1 stop8h 10m
Mon 10/52:29 pm -
1 stop25h 17m
Deal found 8/29![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/299:25 pm -
1 stop16h 45m
Wed 10/72:29 pm -
1 stop6h 29m
Deal found 8/29![Frontier logo]()
$114
This Kiwi.com deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:38 am -
1 stop7h 32m
Mon 10/52:29 pm -
1 stop25h 17m
Deal found 8/29![Frontier logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:38 am -
1 stop7h 32m
Fri 10/22:29 pm -
1 stop17h 56m
Deal found 8/29![Frontier logo]()
$165
One-way flights from Baltimore to St. LouisSearch for one-way flight options from Baltimore to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 1, 2026.
Search for one-way flight options from Baltimore to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 1, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2910:22 am -
1 stop27h 48m
Deal found 8/26![Frontier logo]()
$56
This Kiwi.com deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:38 am -
1 stop7h 32m
Deal found 8/28![Frontier logo]()
$58
This Kiwi.com deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/285:40 am -
1 stop13h 00m
Deal found 8/27![Frontier logo]()
$60
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/236:38 am -
1 stop7h 32m
Deal found 8/26![Frontier logo]()
$66
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/286:00 am -
1 stop8h 10m
Deal found 8/26![Frontier logo]()
$72
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/159:25 pm -
1 stop16h 45m
Deal found 8/26![Frontier logo]()
$76
This Kiwi.com deal was found by Cheapflights users on 8/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/249:25 pm -
1 stop16h 45m
Deal found 8/26![Frontier logo]()
$77
This Kiwi.com deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/19:25 pm -
1 stop16h 45m
Deal found 8/29![Frontier logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/49:25 pm -
1 stop16h 45m
Deal found 8/27![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:24 am -
1 stop12h 16m
Deal found 8/27![Frontier logo]()
$93
Find flight deals from Baltimore to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Baltimore (BWI) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 1, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $114 (Kiwi.com) |
One-way from | $56 (Kiwi.com) |
Popular in | June |
Cheapest in | October |
Average price | $391 |
Cheapflights Fare Finder
Customize your flight search to find flights from Baltimore to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 1, 2026.
Use the filters below to find and compare flights from Baltimore to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
BaltimoreSt. Louis
BWI Baltimore/Washington - STL Lambert-St Louis
BWISTL
Baltimore/Washington
Sat 10/17
6:30 am-7:40 am
Nonstop2h 10m
Lambert-St Louis
Tue 10/20
8:30 am-1:10 pm
1 stop3h 40m
$302
BaltimoreSt. Louis
BWI Baltimore/Washington - STL Lambert-St Louis
BWISTL
Baltimore/Washington
Thu 10/1
6:00 pm-9:00 pm
1 stop4h 00m
Lambert-St Louis
Mon 10/5
5:40 pm-8:40 pm
Nonstop2h 00m
$311
BaltimoreSt. Louis
BWI Baltimore/Washington - STL Lambert-St Louis
BWISTL
Baltimore/Washington
Tue 10/27
7:00 am-1:20 pm
1 stop7h 20m
Lambert-St Louis
Thu 10/29
6:00 am-1:06 pm
1 stop6h 06m
$325
BaltimoreSt. Louis
BWI Baltimore/Washington - STL Lambert-St Louis
BWISTL
Baltimore/Washington
Wed 9/23
7:55 pm-9:15 pm
Nonstop2h 20m
Lambert-St Louis
Fri 9/25
4:15 pm-7:15 pm
Nonstop2h 00m
$347
BaltimoreSt. Louis
BWI Baltimore/Washington - STL Lambert-St Louis
BWISTL
Baltimore/Washington
Sun 9/20
6:10 am-9:29 am
1 stop4h 19m
Lambert-St Louis
Tue 9/22
10:05 am-3:40 pm
1 stop4h 35m
$351
Quickest round-trip
BaltimoreSt. Louis
BWI Baltimore/Washington - STL Lambert-St Louis
BWISTL
Baltimore/Washington
Thu 11/26
10:05 am-11:25 am
Nonstop2h 20m
Lambert-St Louis
Fri 11/27
8:25 pm-11:20 pm
Nonstop1h 55m
$353
BaltimoreSt. Louis
BWI Baltimore/Washington - STL Lambert-St Louis
BWISTL
Baltimore/Washington
Thu 11/5
7:40 pm-9:00 pm
Nonstop2h 20m
Lambert-St Louis
Sun 11/8
6:40 am-9:35 am
Nonstop1h 55m
$362
BaltimoreSt. Louis
BWI Baltimore/Washington - STL Lambert-St Louis
BWISTL
Baltimore/Washington
Fri 10/9
10:00 pm-11:20 pm
Nonstop2h 20m
Lambert-St Louis
Sun 10/11
8:25 am-2:45 pm
1 stop5h 20m
$377
BaltimoreSt. Louis
BWI Baltimore/Washington - STL Lambert-St Louis
BWISTL
Baltimore/Washington
Fri 9/18
7:30 am-12:00 pm
1 stop5h 30m
Lambert-St Louis
Mon 9/21
6:50 pm-9:55 pm
Nonstop2h 05m
$377
BaltimoreSt. Louis
BWI Baltimore/Washington - STL Lambert-St Louis
BWISTL
Baltimore/Washington
Tue 9/22
5:35 pm-10:15 pm
2 stops5h 40m
Lambert-St Louis
Fri 9/25
5:40 pm-10:40 pm
1 stop4h 00m
$392
Showing 1-10 of 21 resultsSorted by cheapest first
Compare providers for flights from Baltimore to St. Louis
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Baltimore to St. Louis in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Baltimore-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Baltimore-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Baltimore-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Baltimore-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Baltimore-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Baltimore to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Baltimore with our price prediction graph.
BWI-STL
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Baltimore to St. Louis
How far ahead should I book a flight from Baltimore to St. Louis?
To ensure you get the cheapest price possible for a flight from Baltimore to St. Louis, you should look to book at least 26 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Baltimore to St. Louis?
Currently, October is the cheapest month in which you can book a flight from Baltimore to St. Louis (average of $173). Flying from Baltimore to St. Louis in June is currently the most expensive (average of $513). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from BWI to STL?
Find hourly flight availability from Baltimore to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 1, 2026.
One of the essential ways to save on airfare from Baltimore to St. Louis is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the afternoon could potentially save you up to 11% on airfare.
What is the cheapest day to fly from Baltimore to St. Louis?
Use this chart to determine the cheapest time to fly round-trip from Baltimore to St. Louis. Price data was last updated on August 29, 2026.
Travelers seeking maximum savings on their Baltimore to St. Louis flight should consider departing on Sunday at noon when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
The best insider tips for Baltimore to St. Louis flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Baltimore to St. Louis trip
Our travel experts
Reviews of airlines servicing St. Louis
Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated September 1, 2026.
Peruse reviews from past customers who have flown with Southwest,Delta, andAmerican Airlines from Baltimore to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2025
MCO - STL
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2025
MCO - STL
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2025
MCO - STL
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2025
MCO - STL
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2025
MCO - STL
Related info for your journey
Find useful and relevant information for your journey from Baltimore to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsEdwardsville
Fairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
St. Louis flight routes
Alternative routes for Baltimore to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to St. Louis by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Baltimore to St. Louis by cabin class
Find flights from Baltimore to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Baltimore and St. Louis flights
Browse other Baltimore and St. Louis flight options. Last updated on September 1, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 1, 2026.
Top 4 airlines flying from Baltimore to St. Louis
Discover the top 4 airlines that operate flights from Baltimore to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 1, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$141 | Average$351 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$142 | Average$173 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$289 | Average$452 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$350 | Average$366 | FlexibilityNo cancel fee | On-time71% |