A city skyline with a prominent arch bridge at sunset.

$58 Cheap Flights from Baltimore (BWI) to St. Louis (STL)

View $58 flight on Wed, Oct 28, 2026Opens in a new window

Popular airlines from Baltimore Washington Intl. Airport (BWI) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Baltimore to St. Louis (BWI-STL)

Prices were available within the past 7 days and start at $58 for one-way flights and $115 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Oct 28 - Wed, Nov 4
BWI
Baltimore
STL
St. Louis
$115 Roundtrip, found 1 hour ago
$115
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Wed, Oct 28 from Baltimore to St. Louis, returning Wed, Nov 4, priced at $115 found 1 hour ago
Frontier Airlines
Wed, Oct 28 - Mon, Nov 2
BWI
Baltimore
STL
St. Louis
$122 Roundtrip, found 8 hours ago
$122
Roundtrip
found 8 hours ago
Select Frontier Airlines flight, departing Wed, Oct 28 from Baltimore to St. Louis, returning Mon, Nov 2, priced at $122 found 8 hours ago
Frontier Airlines
Wed, Oct 14 - Fri, Oct 16
BWI
Baltimore
STL
St. Louis
$131 Roundtrip, found 2 days ago
$131
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Wed, Oct 14 from Baltimore to St. Louis, returning Fri, Oct 16, priced at $131 found 2 days ago
Frontier Airlines
Fri, Oct 30 - Wed, Nov 4
BWI
Baltimore
STL
St. Louis
$149 Roundtrip, found 2 days ago
$149
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Fri, Oct 30 from Baltimore to St. Louis, returning Wed, Nov 4, priced at $149 found 2 days ago
Frontier Airlines
Wed, Nov 4 - Mon, Nov 9
BWI
Baltimore
STL
St. Louis
$150 Roundtrip, found 1 day ago
$150
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Nov 4 from Baltimore to St. Louis, returning Mon, Nov 9, priced at $150 found 1 day ago
Frontier Airlines
Fri, Oct 30 - Wed, Nov 4
BWI
Baltimore
STL
St. Louis
$159 Roundtrip, found 3 days ago
$159
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Fri, Oct 30 from Baltimore to St. Louis, returning Wed, Nov 4, priced at $159 found 3 days ago
Southwest Airlines
Wed, Oct 28 - Wed, Nov 4
BWI
Baltimore
STL
St. Louis
$184 Roundtrip, found 1 hour ago
$184
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Wed, Oct 28 from Baltimore to St. Louis, returning Wed, Nov 4, priced at $184 found 1 hour ago
American Airlines
Wed, Oct 28 - Wed, Nov 4
BWI
Baltimore
STL
St. Louis
$275 Roundtrip, found 1 hour ago
$275
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Wed, Oct 28 from Baltimore to St. Louis, returning Wed, Nov 4, priced at $275 found 1 hour ago
Delta
Wed, Oct 28 - Wed, Nov 4
BWI
Baltimore
STL
St. Louis
$275 Roundtrip, found 1 hour ago
$275
Roundtrip
found 1 hour ago
Select Delta flight, departing Wed, Oct 28 from Baltimore to St. Louis, returning Wed, Nov 4, priced at $275 found 1 hour ago
United
Wed, Oct 28 - Wed, Nov 4
BWI
Baltimore
STL
St. Louis
$275 Roundtrip, found 1 hour ago
$275
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Oct 28 from Baltimore to St. Louis, returning Wed, Nov 4, priced at $275 found 1 hour ago

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $450
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $450

What you need to know for your flight from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl.

Baltimore (BWI) to St. Louis (STL) at a glance

Travel from Baltimore (BWI) to St. Louis (STL) with a selection of airlines catering to this domestic short-haul route. Whether you prefer full-service options or budget-friendly carriers, you can compare various BWI to STL flights to discover the itinerary that aligns with your budget and schedule. As you plan your journey to explore the iconic sights and vibrant neighborhoods of St. Louis, make sure to check the key details about flight time and services available from Baltimore Washington International Thurgood Marshall Airport to Lambert-St. Louis International Airport.

  • Fastest flight duration: around 2h 15m non-stop
  • Route distance: roughly 700 miles (1,130 km)
  • Flights per week: around 15+ flights with multiple daily departures on average
  • Typical fares (one-way): economy tickets often range from $90–$415, depending on seasonality and how far ahead you book

Flights from Baltimore Washington International Thurgood Marshall Airport (BWI) to Lambert-St. Louis International Airport (STL)

Based on the latest traveler bookings, here are the top airlines flying from Baltimore to St. Louis, favored for both non-stop and one-stop flights. Common layover options include Hartsfield-Jackson Atlanta International Airport (ATL) with a layover of about 1 hour and 30 minutes, Charlotte-Douglas International Airport (CLT) offering a 1-hour layover, and O'Hare International Airport (ORD) with a layover of approximately 1 hour. These choices allow you to balance cost, total travel time, and cabin class for the ideal itinerary.

  • Southwest Airlines: This budget-friendly airline provides both non-stop and one-stop flights, typically charging one-way fares between $100 and $455. It represents around 58% of departures on this route, with non-stop flights averaging about 2 hours and 15 minutes in duration.
  • American Airlines: A comprehensive service airline, American offers one-stop flights with one-way prices generally ranging from $90 to $345. It makes up about 16% of the departures on this route, featuring an in-flight duration of 3 hours and 45 minutes, totaling approximately 4 hours and 45 minutes when factoring in layovers.
  • Delta: As another full-service option, Delta provides one-stop service with one-way fares usually falling between $100 and $410. It accounts for around 11% of the departures on this route, with a flight time of 3 hours and 45 minutes and an overall journey duration of about 4 hours and 45 minutes, including layover times.
  • Frontier Airlines: A low-cost choice, Frontier offers one-stop flights with one-way fares typically ranging from $90 to $210. It comprises roughly 9% of the route's departures, featuring an in-flight time of 3 hours and 45 minutes and a total journey time of about 4 hours and 45 minutes when considering layovers.
  • United: This full-service airline provides one-stop service with one-way fares generally between $110 and $355. United makes up around 4% of the departures on this route, with flights taking approximately 3 hours and 45 minutes in the air, leading to a total travel time of roughly 4 hours and 45 minutes, including layover periods.

Travelers flying from Baltimore to St. Louis can opt for an upgrade, as American Airlines provides first-class service on this route.

Best time to fly from Baltimore (BWI) to St. Louis (STL)

The most popular months for travelers flying from Baltimore to St. Louis are February, March, and April, when peak temperatures in St. Louis reach up to 56.1°F in April. If you prefer quieter travel, consider September, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 70.9°F. For better deals, May usually offers the lowest average one-way fare around $190. Flight availability peaks in August, with approximately 19 flights per week, making it easier to find convenient departure times. July has the fewest flights, with approximately 13 flights per week.

  • Cheapest time to fly: May usually offers good deals with average one-way fare around $190, roughly 13% cheaper than the yearly average.
  • More budget-friendly months to fly: August and January typically offer average one-way fares of around $206.
  • Most flight options: August has the highest number of flights from Baltimore to St. Louis, with approximately 19 flights per week, giving you more flexibility in scheduling your trip.
calendar iconMonthtemperature iconTemperaturecrowd level iconDemandflights iconWeekly Flightsprice iconAverage one-way Fare
January31.6°F (-0.2°C)Average14$206
February34.9°F (1.6°C)High15$231
March46.4°F (8.0°C)High18$235
April56.1°F (13.4°C)High18$223
May66.6°F (19.2°C)Average16$190
June76.1°F (24.5°C)Average17$238
July78.6°F (25.9°C)Low13$232
August77.0°F (25.0°C)Average19$206
September70.9°F (21.6°C)Low14$214
October58.6°F (14.8°C)Average16$227
November46.2°F (7.9°C)Low17$218
December37.8°F (3.2°C)Average17$214

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative route from Baltimore (BWI) to St. Louis (STL)

  • Washington to St. Louis (DCA-STL): Ronald Reagan Washington National Airport (DCA) is approximately 30 miles from Baltimore Washington International Thurgood Marshall Airport (BWI). One-way economy fares on this route generally fall between $90 and $400, varying with the season and how far in advance you book. Travelers can choose between non-stop and one-stop flights. Major airlines serving this route include American Airlines and Southwest Airlines, a budget-friendly option. Additionally, first-class service is offered on this route.

How to find the best prices for flights from Baltimore (BWI) to St. Louis (STL)

Getting some of the best deals on flights from Baltimore to St. Louis is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are usually found when booking 2-8 weeks in advance, although most travelers tend to book within 2 weeks. Morning departures from 5 am to 12 pm often offer lower prices and are the most popular times to fly. Additionally, flying on Saturday generally provides cheaper rates, while Thursday is the most commonly chosen travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Lambert-St. Louis International Airport from Baltimore Washington International Thurgood Marshall Airport

St. Louis welcomes travelers from Baltimore with a range of transport options based on price, convenience, and proximity. Here's how to reach St. Louis efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in St. Louis, with private rides that can be arranged in advance.
  • Car rental: Renting a car from Lambert-St. Louis International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Lambert-St. Louis International Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Lambert-St. Louis International Airport, Lambert Main Terminal Station, a metro station, is located just 0.1 miles away on foot, providing convenient access for travelers.

Frequently asked questions

How much does a flight from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
You can find cheap one-way flights from $58 and cheap return flights from $115 Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.) with Expedia. One-way flights typically cost between $173 and $631, and return flights often range between $334 and $1004. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
September is the cheapest month to fly from Baltimore (BWI) to St. Louis (STL), with average round-trip fares around $303. This is about 20% lower than the average price throughout the year, as travel tends to slow down after the summer. Other budget-friendly months include May and August.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Enter BWI to STL and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Southwest Airlines is one of the cheapest airlines offering nonstop flights from Baltimore Washington Intl. Thurgood Marshall (BWI) to Lambert-St. Louis Intl. (STL), with round-trip tickets starting from around $191. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
To find a cheap flight from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best airline to fly with from Baltimore, MD (BWI) to St. Louis, MO (STL) will differ from traveler to traveler. If you like to fly early, Southwest Airlines offers early morning flights. If price is the most important factor, Southwest Airlines typically offers the lowest fares. Southwest Airlines offers the most daily flights from BWI to STL, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
For your journey from Baltimore, MD (BWI) to St. Louis, MO (STL), September and May are the best months to fly. September features return flights at around $303, while May is also popular, offering a balance of good prices and favorable travel conditions. This information is based on booking data from the past year.*Prices based on flights available on Expedia in the last year.
How many flights per day from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You can find approximately 3 nonstop flights per day from Baltimore Washington Intl. Thurgood Marshall (BWI) to Lambert-St. Louis Intl. (STL). For more options, look at flights that include layovers.
What is the earliest flight from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The earliest flight from Baltimore Washington International Thurgood Marshall Airport (BWI) to Lambert-St. Louis International Airport (STL) typically departs at 5:00 AM, operated by American Airlines. An early departure like this allows you to make the most of your day in St. Louis. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The most popular departure times for flights from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.) are in the early morning, from 6am to 9am. About 29% of passengers prefer this time window. Many major carriers, including Southwest Airlines, Delta and Southwest, offer flights during this window. This timing works well for travelers looking to maximize their day in St. Louis.
How long does it take to fly from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Direct flights from BWI to STL usually take about 2 hours 30 minutes, traveling roughly 736 miles. If you opt for a connecting flight, expect to add around 4 hours 20 minutes to your journey. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
First class is available on flights from BWI to STL. First class cabins are available on:

  • American Airlines
  • Delta Air Lines
  • United Airlines
  • Spirit Airlines

How do I earn miles on a Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?
It's easy to earn miles on a Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for St. Louis from Baltimore Washington Intl. Thurgood Marshall (BWI)?
From Baltimore Washington Intl. Thurgood Marshall (BWI), you can fly into Lambert-St. Louis Intl. (STL) to reach St. Louis. Some flights may connect through major hubs like MYR (MYR), O'Hare Intl. (ORD), Louisville Intl. (SDF) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?
Typically, booking a last minute flight from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?
Securing a Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.) St Louis Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you booked your Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$115
Distance
735 mi
Average flight time
1 hour 37 mins

Book with confidence

Baltimore to St. Louis Flights

The cheapest times to fly from Baltimore to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Baltimore to St. Louis are during the month of October. You can find some of the cheapest flights from Baltimore to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Baltimore to St. Louis

Sunday is one of the best days to book for cheap flights from Baltimore to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Baltimore to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Baltimore to St. Louis in 2026. You can also book with separate airlines for your outbound and return journeys, from $58 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Baltimore to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Baltimore to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Baltimore to St. Louis Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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