Cheap flights from St. Louis to Washington, D.C. from $57

If you’re not able to fly to Baltimore in September, then April is your next best option. Flight prices from St. Louis to Baltimore during April average around $370.

The cheapest day to depart from St. Louis to Baltimore is on a Thursday. Travelers who choose to depart for Baltimore on a Thursday will often find tickets for as low as $405. 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.

Flying to Baltimore from St. Louis in the morning is the least expensive time of day to depart. momondo users have found prices as low as $436 when looking at flights departing in the morning. Flights in the evening are often more expensive with an average ticket price of $497.

Fly from Lambert-St Louis to Baltimore/Washington for the best Lambert-St Louis - Baltimore/Washington flight prices

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 $420 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 $352 on momondo.

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.

You could potentially save up to 21% on your flight if you consider stops on a St. Louis to Baltimore flight.

As of August 2026, prices for St. Louis to Baltimore flights are approximately 96% more expensive when compared to flights at the same time last year.

Southwest and Frontier are the most popular carriers operating from Lambert-St Louis to Baltimore/Washington

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 56% of people opting to fly with this airline when traveling to Baltimore. Keep in mind that there are 5 different airlines that fly to Baltimore on a routine basis, so you have a few additional options to choose from.

As of August 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 45% of flights taking off in the afternoon.

15 flights are operational weekly from St. Louis to Baltimore as of August 2026. The most popular departure day for this route is Mon, with 33% of flights per week taking off on this day.