$58 Find Cheap Flights from Baltimore to St. Louis - Compare and Save

Among airlines operating Baltimore to St. Louis flights:

• Southwest: offers free seat selection

Extra legroom and free seat selection availability depends on fare class and route.

Only Southwest operates flights between Baltimore and St. Louis.

Flights from Baltimore to St. Louis usually depart from Baltimore/Washington (BWI) and arrive at Lambert-St Louis (STL).

Here are some options for this route, based on selected ticket types and cabin classes:

• Southwest: a cabin bag and a checked bag in Economy Class
• JetBlue: a cabin bag in Economy Class class

Bag allowance can vary by ticket type, cabin class, route and airline, so travelers should check the fare details before booking.

Two cabin classes are available on flights from Baltimore to St. Louis:

• Economy Class
• First Class

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $184 round-trip via Orlando (MCO), compared to $449 for nonstop.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $45–$90 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

The Boeing 737 MAX 8 family is used most often on this route, operated mainly by Southwest and United Airlines. Other aircraft seen on the route include Boeing 737-800 Passenger/BBJ2 (winglets) variants.

One-stop flights from Baltimore to St. Louis most commonly connect through:

• Atlanta Hartsfield-Jackson (ATL) - 40% of one-stop connections
• Charlotte Douglas (CLT) - 21% of one-stop connections
• Chicago O'Hare Intl (ORD) - 13% of one-stop connections
• Detroit Metropolitan Wayne County (DTW) - 12% of one-stop connections

Atlanta Hartsfield-Jackson (ATL) handles the largest share of one-stop connections on this route.

On the Baltimore to St. Louis route, being flexible with your departure day can save you up to 42%. Saturday is the cheapest day at $297 round-trip on average, while Monday is the most expensive at $508: a $211 difference. Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

Morning is the busiest departure period on Baltimore to St. Louis flights, with 25% of flights leaving in that window. Afternoon departures account for 25%, evening flights for 25%, and night flights for 25%.

Some of the most popular sights in St. Louis are Downtown St. Louis, Busch Stadium and Enterprise Center. These are among the most viewed places in St. Louis on KAYAK.

These are the earliest and latest flight times available from Baltimore to St. Louis:

• Earliest: departs at 6:15 am and lands at 8:33 am
• Latest: departs at 10:45 pm and lands at 1:03 am.

The flight takes about 2h 18m.

Last-minute fares on this route - booked within 2 weeks of departure - run 26% above the route average of $382. Book 4 weeks before departure for the lowest fares.

A nonstop flight from Baltimore to St. Louis takes 2h 18m, covering 736 miles.

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID, or another TSA-accepted form of identification.

One-way fares from Baltimore to St. Louis are currently lower than usual. Average one-way flight prices are about $140, which is 30% below the typical average for this route.

Flying via Detroit Metropolitan Wayne County (DTW) gives the shortest average 1-stop total travel time at 4h 14m, compared with 4h 42m via Charlotte Douglas (CLT) and 4h 48m via Nashville Intl (BNA).

St. Louis is 1 hour behind Baltimore (Central Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.

Lambert-St Louis Airport (STL) hosts 5 major car rental companies, with daily rates starting from around $31 for economy cars. Top options include:
• Hertz
• Budget
• Alamo
• Enterprise Rent-A-Car
• Payless

Round-trip flights from Baltimore to St. Louis range from $280 to $475, with an average of $382 over the past 12 months. Anything below $280 counts as a good deal.