Cheap flights from St. Louis to Washington, D.C. from $59
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Washington, D.C. departing on 11/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Fly from
Fly to
Route
Depart
Return
St. LouisBaltimore
STL Lambert-St Louis - BWI Baltimore/Washington
STLBWI
Lambert-St Louis
Wed 11/18
6:34 pm-12:33 am
1 stop4h 59m
Baltimore/Washington
Wed 12/2
6:00 am-11:17 am
1 stop6h 17m
St. LouisBaltimore
STL Lambert-St Louis - BWI Baltimore/Washington
STLBWI
Lambert-St Louis
Wed 11/4
6:44 pm-12:33 am
1 stop4h 49m
Baltimore/Washington
Wed 11/11
10:41 am-5:42 pm
1 stop8h 01m
St. LouisBaltimore
STL Lambert-St Louis - BWI Baltimore/Washington
STLBWI
Lambert-St Louis
Fri 11/13
6:44 pm-12:33 am
1 stop4h 49m
Baltimore/Washington
Mon 11/16
10:16 am-5:40 pm
1 stop8h 24m
St. LouisBaltimore
STL Lambert-St Louis - BWI Baltimore/Washington
STLBWI
Lambert-St Louis
Sat 11/14
11:23 am-5:58 pm
1 stop5h 35m
Baltimore/Washington
Thu 11/19
5:01 am-8:13 am
1 stop4h 12m
St. LouisBaltimore
STL Lambert-St Louis - BWI Baltimore/Washington
STLBWI
Lambert-St Louis
Sat 11/7
11:15 am-7:01 pm
1 stop6h 46m
Baltimore/Washington
Mon 11/9
5:31 pm-9:40 pm
1 stop5h 09m
St. LouisBaltimore
STL Lambert-St Louis - BWI Baltimore/Washington
STLBWI
Lambert-St Louis
Mon 11/16
2:25 pm-9:10 pm
1 stop5h 45m
Baltimore/Washington
Tue 11/17
6:15 am-7:40 am
Nonstop2h 25m
St. LouisBaltimore
STL Lambert-St Louis - BWI Baltimore/Washington
STLBWI
Lambert-St Louis
Mon 11/2
6:40 am-9:35 am
Nonstop1h 55m
Baltimore/Washington
Mon 11/9
6:00 pm-9:00 pm
1 stop4h 00m
St. LouisBaltimore
STL Lambert-St Louis - BWI Baltimore/Washington
STLBWI
Lambert-St Louis
Sat 11/14
8:22 am-3:51 pm
1 stop6h 29m
Baltimore/Washington
Thu 11/19
6:04 am-12:14 pm
1 stop7h 10m
St. LouisBaltimore
STL Lambert-St Louis - BWI Baltimore/Washington
STLBWI
Lambert-St Louis
Sat 11/14
5:30 pm-12:58 am
1 stop6h 28m
Baltimore/Washington
Mon 11/16
6:29 pm-11:56 pm
1 stop6h 27m
St. LouisBaltimore
STL Lambert-St Louis - BWI Baltimore/Washington
STLBWI
Lambert-St Louis
Sat 11/14
11:23 am-5:58 pm
1 stop5h 35m
Baltimore/Washington
Thu 11/19
5:01 am-8:13 am
1 stop4h 12m
See travel insights to Washington, D.C. from
How to get the cheapest flight ticket from St. Louis to Baltimore
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the typical price of a round-trip flight between St. Louis and Baltimore?
Prices are currently low for flights on this route.
Typical prices usually range from $382 to $660.The lowest price recently found on this route was $131.
What is the cheapest month to fly to Baltimore?
If you’re not able to fly to Baltimore in April, then September is your next best option. Flight prices from St. Louis to Baltimore during September average around $379.
What is the cheapest day to depart on your flight to Baltimore?
The cheapest day to depart from St. Louis to Baltimore is on a Tuesday. Travelers who choose to depart for Baltimore on a Tuesday will often find tickets for as low as $416. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $495. These prices are subject to change though, so be sure to set up a Price Alert for flights to Baltimore.
What is the cheapest time of day to depart on your flight to Baltimore?
Flying to Baltimore from St. Louis at noon is the least expensive time of day to depart. momondo users have found prices as low as $447 when looking at flights departing at noon. Flights in the evening are often more expensive with an average ticket price of $515.
What is the cheapest Lambert-St Louis to Baltimore/Washington flight route?
Fly from Lambert-St Louis to Baltimore/Washington for the best Lambert-St Louis - Baltimore/Washington flight prices
How far in advance should I book a flight from St. Louis to Baltimore?
You are more likely to see cheaper flights to Baltimore from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Baltimore for around $437 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Baltimore from St. Louis for as low as $345 on momondo.
What cabin class options are available on St. Louis to Baltimore flights?
There is only 1 cabin class available to choose from on St. Louis to Baltimore flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
Can stopping save me money on St. Louis to Baltimore flights?
You could potentially save up to 64% on your flight if you consider stops on a St. Louis to Baltimore flight.
How have St. Louis to Baltimore flight prices changed over time?
As of October 2026, prices for St. Louis to Baltimore flights are approximately 37% more expensive when compared to flights at the same time last year.
What is the cheapest airline that flies from Lambert-St Louis to Baltimore/Washington?
Frontier, Southwest, and Delta are the most popular carriers operating from Lambert-St Louis to Baltimore/Washington
What airlines fly to Baltimore?
Southwest, American Airlines and United Airlines are the top three most popular airlines that fly to Baltimore from St. Louis according to our data. Southwest is the first choice among our users, with 58% of people opting to fly with this airline when traveling to Baltimore. Keep in mind that there are 6 different airlines that fly to Baltimore on a routine basis, so you have a few additional options to choose from.
How many flights depart from St. Louis to Baltimore on average per day?
As of October 2026, there are 2 flights per day flying from St. Louis to Baltimore. The most common time of day flights depart is 6:00AM, with 50% of flights taking off in the afternoon.
How many flights depart from St. Louis to Baltimore on average per week?
15 flights are operational weekly from St. Louis to Baltimore as of October 2026. The most popular departure day for this route is Mon, with 33% of flights per week taking off on this day.
When to book flights from St. Louis to Baltimore
Cheap St. Louis to Baltimore (STL to BWI) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to Baltimore
Frequently asked questions about flying from St. Louis to Baltimore
How far is Lambert-St Louis to Baltimore/Washington by plane?
The straight-line distance from Lambert-St Louis to Baltimore/Washington is 730.2 mi. By plane, this route typically takes 1h 55m.
When did momondo last update prices for flights from Lambert-St Louis Airport to Baltimore/Washington Airport?
Prices for flights from Lambert-St Louis Airport to Baltimore/Washington Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to Baltimore/Washington Airport?
As of October 2026, there are 3 operators available to choose from for flights from Lambert-St Louis Airport to Baltimore/Washington Airport.
How old do you have to be to fly from Lambert-St Louis Airport to Baltimore/Washington Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Baltimore/Washington Airport.
What documentation or ID do you need to fly to Baltimore/Washington Airport?
The travel and health documents required for your trip to Baltimore/Washington Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Baltimore/Washington Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from St. Louis to Baltimore?
Based on momondo bookings for flights between St. Louis and Baltimore, the leading plane model is Boeing 737 MAX 8, making up 34.94% of the total bookings. Other popular models include Boeing 737-800 Passenger/BBJ2 (winglets) with 31.93%, Canadair (Bombardier) Regional Jet CRJ-550 with 11.45%, and Boeing 737-800 with 3.61%.
What is the most popular airline from St. Louis to Baltimore?
momondo data reveals that the most frequently booked airline on the route from St. Louis to Baltimore is Southwest, representing 79% of all bookings. The subsequent popular airlines are Frontier at 11% and American Airlines at 10%.
Best airlines flying from St. Louis to Baltimore
Compare and see reviews for airlines that fly from St. Louis to Baltimore with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $147 | Free Cancellation | Rating 5.5 2,550 reviews | |||
| PriceFrom $282 | Free Cancellation | Rating 7.0 12,127 reviews | |||
| PriceFrom $314 | Free Cancellation | Rating 7.9 4,214 reviews |
Southwest Flights From St. Louis to Baltimore
Southwest flies from St. Louis to Baltimore around 15 times per week, with 4,215 momondo users rating the airline 7.9/10. The cheapest Southwest deal from St. Louis to Baltimore in the last 72 hours was $314 (round-trip), much lower than the average airfare cost of $451 for Southwest flights on this route.
Why use momondo?
Why should I use momondo to find a flight deal from St. Louis to Baltimore?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Baltimore. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from St. Louis to Baltimore with flexible booking policies on momondo?
All flight searches from St. Louis to Baltimore on momondo can be filtered to show those which offer flexible booking policies.
How can momondo help me find flights from St. Louis to Baltimore?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Baltimore from St. Louis.
I’m not ready to book a flight from St. Louis to Baltimore right now. Can momondo alert me if prices change?
If you are not ready to book a flight from St. Louis to Baltimore now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Baltimore and let you know when they change.