Route guide · 736 miles
Cheap Flights from Baltimore to St. Louis
BWI → STL · Nonstop 2h 0m · Live round-trip fares
The run from Baltimore (BWI) to St. Louis (STL) is 736 miles of sky, and ticket prices on it are anything but steady. One week can cost double the next. Booking about 2–4 weeks in advance — and watching fares with a free Airfare Deal alert — is how regulars on this route keep costs down.
Live fares for BWI → STL are updating. Use the search below for real-time prices.
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Updated daily
Flight time
2h 0m
Nonstop, typical
Distance
736 mi
BWI → STL
Book ahead
2–4 weeks
Best window, typically
Nonstop airlines
1
Southwest Airlines
Nonstop flights from Baltimore to St. Louis
The fastest way between the two cities is the nonstop: about 2h 0m for the 736-mile run from BWI to STL. Those flights are flown by Southwest Airlines. Prices behave best when you book 2–4 weeks out.
Booking insights: Baltimore → St. Louis
- Distance: 736 miles · nonstop flight time: 2h 0m.
- Fares tend to bottom out when you book about 2–4 weeks ahead — earlier than that rarely helps, later usually hurts.
- Midweek departures (Tue–Thu) are consistently cheaper than weekend flights.
- A free fare alert beats daily checking: we watch this route and ping you when prices drop.
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Flying from Baltimore to St. Louis: what you need to know
The flight
The nonstop from BWI to STL runs about 2h 0m over 736 miles. It's a comfortable mid-range flight: long enough that seat choice matters a little, short enough that paying up for extras rarely does.
Airlines on this route
Southwest Airlines flies this route nonstop. That matters more than it sounds: the cheapest fare on one carrier is rarely the same product as the cheapest on another. Checked-bag fees, free seat selection and change rules all differ, so compare the full trip cost before you pick a winner. See our airline guides for exactly what each carrier charges — then send an enquiry and we'll confirm the all-in price for your dates.
Leaving from Baltimore (BWI)
Plan to be at the airport two hours before a domestic departure — ninety minutes can work at smaller airports outside peak times, but security lines are the one variable you can't control. If you're checking a bag, add time rather than cutting it close. Our Baltimore airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in St. Louis (STL)
Before you land, know how you're getting from the airport to where you're staying — it's the part of the trip people forget to plan. The St. Louis airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check St. Louis to Baltimore fares — prices on the return direction often move on a different rhythm.
When to book
For a trip of 736 miles, booking 2–4 weeks ahead typically lands you in the sweet spot. Leave it to the final two weeks and prices usually climb as the cheapest seats sell out. If your dates are flexible, midweek departures are where the lower fares hide on most domestic routes.
Good to know before you go
- If you're traveling with only a carry-on, you can skip the bag-drop line entirely with mobile check-in.
- Download the airline's app before you fly; gate changes and delays show up there first.
- Nonstop time on this route is about 2h 0m — a one-stop itinerary needs to be a lot cheaper to be worth the extra hours.
- Tuesday and Wednesday departures are typically the cheapest days on domestic routes.
- Screenshot your fare before you enquire — prices move, and a saved fare helps our team match or beat it.
Baltimore to St. Louis flight FAQs
How long is the flight from BWI to STL?
Nonstop flights from Baltimore to St. Louis take about 2h 0m and cover roughly 736 miles. One-stop itineraries add 2–4 hours depending on the layover city.
Are there nonstop flights from Baltimore to St. Louis?
Southwest Airlines typically operate nonstop flights from BWI to STL. Nonstops are usually cheapest when booked 2–4 weeks ahead of departure.
What is the cheapest month to fly from Baltimore to St. Louis?
Travelers usually find the gentlest prices away from peak periods — think post-holiday January and the early-fall weeks. Midweek dates inside those windows are cheaper still.
How much are last minute flights from BWI to STL?
Last-minute flights from BWI to STL (booked within 7 days of departure) typically cost noticeably more than fares booked 2–4 weeks out. Booking early is the smarter move.
What is a good round-trip deal from Baltimore to St. Louis?
A good deal is anything at or below the recent fares shown above. Set a free Airfare Deal alert and we'll ping you the moment fares drop.
Which airlines fly from Baltimore to St. Louis?
You'll mainly see Southwest Airlines on Baltimore to St. Louis. Checking each against the live fares below is the surest way to find the lowest price for your dates.
How early should I get to Baltimore airport for this flight?
Plan on two hours before departure for a domestic flight — ninety minutes can work at smaller airports outside peak times. If you're checking a bag, earlier is better; the bag-drop line, not the flight, is what runs late.
Do the cheapest fares on this route include a checked bag?
Usually not. Basic economy fares on most airlines include a carry-on but charge extra for checked bags, and seat selection can cost more too. Add up the real total before comparing — a slightly higher regular fare sometimes works out cheaper. Our team confirms the full breakdown with you before you pay.
More cheap flights from Baltimore
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