Cheap flights from Baltimore to St. Louis from $66
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Baltimore to St. Louis departing on 9/4. 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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American Airlines flights from Baltimore to St. Louis
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How to get the cheapest flight ticket from Baltimore to St. Louis
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 cheapest month to fly to St. Louis?
In general, October is the cheapest month to fly from Baltimore to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $300. The month of September is another great option to travel to St. Louis, with average flight prices from Baltimore averaging around $313.
What is the cheapest day to depart on your flight to St. Louis?
The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $354. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $404. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.
What is the cheapest time of day to depart on your flight to St. Louis?
Flying to St. Louis from Baltimore at noon is the least expensive time of day to depart. momondo users have found prices as low as $315 when looking at flights departing at noon. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $386 per ticket.
What is the cheapest Baltimore/Washington to Lambert-St Louis flight route?
Fly from Baltimore/Washington to Lambert-St Louis for the best Baltimore/Washington - Lambert-St Louis flight prices
How far in advance should I book a flight to St. Louis?
You are more likely to see cheaper flights to St. Louis from Baltimore when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $349 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Baltimore for as low as $255 on momondo.
What cabin class options are available on Baltimore/Washington to Lambert-St Louis flights?
There are 1 cabin classes available to choose from on Baltimore/Washington to Lambert-St Louis 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 Baltimore to St. Louis flights?
No. A direct flight is the cheapest option for a flight between Baltimore to St. Louis.
How have Baltimore to St. Louis flight prices changed over time?
As of June 2025, prices for Baltimore to St. Louis flights are approximately 14% cheaper when compared to flights at the same time last year.
What is the cheapest airline that flies from Baltimore/Washington to Lambert-St Louis?
Spirit Airlines, American Airlines, and Southwest are the most popular carriers operating from Baltimore/Washington to Lambert-St Louis
What airlines fly to St. Louis?
Southwest, American Airlines and United Airlines are the top three most popular airlines that fly to St. Louis from Baltimore according to our data. Southwest is the first choice among our users, with 43% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 5 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.
How many flights depart from Baltimore to St. Louis on average per day?
The number of flights available between Baltimore and St. Louis is 3 per day as of June 2025. The most frequent departure time is 10:00AM, with 39% of daily flights leaving at noon.
How many flights depart from Baltimore to St. Louis on average per week?
The number of flights available between Baltimore and St. Louis is 25 per week as of June 2025. The most frequent departure day is Mon, with 20% of weekly flights leaving on this day.
When to book flights from Baltimore to St. Louis
Cheap Baltimore to St. Louis (BWI to STL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Baltimore to St. Louis
How far is Baltimore/Washington to Lambert-St Louis by plane?
There are 730.2 mi between Baltimore/Washington and Lambert-St Louis. A reasonable flight in good conditions will take 2h 10m.
When did momondo last update prices for flights from Baltimore/Washington Airport to Lambert-St Louis Airport?
Prices for flights from Baltimore/Washington Airport to Lambert-St Louis Airport refresh daily.
How many operators does momondo search for flights from Baltimore/Washington Airport to Lambert-St Louis Airport?
As of June 2025, there are 4 operators available to choose from for flights from Baltimore/Washington Airport to Lambert-St Louis Airport.
How old do you have to be to fly from Baltimore/Washington Airport to Lambert-St Louis 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 Baltimore/Washington Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Baltimore to St. Louis?
Based on momondo bookings for flights between Baltimore and St. Louis, the leading plane model is Boeing 737 MAX 8, making up 23.12% of the total bookings. Other popular models include Boeing 737-700 Passenger/BBJ1 (winglets) with 21.56%, Boeing 737-800 Passenger/BBJ2 (winglets) with 20.00%, and Canadair (Bombardier) Regional Jet CRJ-550 with 11.04%.
What is the most popular airline from Baltimore to St. Louis?
momondo data reveals that the most frequently booked airline on the route from Baltimore to St. Louis is Southwest, representing 71% of all bookings. The subsequent popular airlines are Delta at 12%, American Airlines at 11%, and Frontier at 6%.
Best airlines flying from Baltimore to St. Louis
Compare and see reviews for airlines that fly from Baltimore to St. Louis with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $108 | Free Cancellation | Rating 5.9 3,296 reviews | |||
| PriceFrom $158 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $169 | Free Cancellation | Rating 8.0 7,963 reviews | |||
| PriceFrom $199 | Free Cancellation | Rating 8.0 4,276 reviews |
Southwest Flights From Baltimore to St. Louis
Southwest is one of the most popular airlines flying from Baltimore to St. Louis, operating 25 flights/week on average for this route. A good Southwest flight deal for Baltimore to St. Louis starts from $199 round-trip, up to an average price of $377. Our users have rated Southwest at 8.0/10.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Baltimore to St. Louis?
It is quick and easy to find Baltimore to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.
Can I find flights from Baltimore to St. Louis with flexible booking policies on momondo?
momondo does allow users to show only those flights to St. Louis from Baltimore which offer a flexible booking policy as well as other useful filters and features.
How can momondo help me find flights from Baltimore to St. Louis?
Once you have performed a search for Baltimore to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.
I’m not ready to book a flight from Baltimore to St. Louis right now. Can momondo alert me if prices change?
Of course. momondo tracks the price of Baltimore to St. Louis flights. All you need is a valid email address and we will do the rest; it is that quick and easy.