$126 Find Cheap Flights from Boston to St. Louis - Compare and Save

Yes. STL provides lactation suites for traveling mothers if they want some privacy while they breastfeed or if they need to pump. These lactation suites are outfitted with a comfortable chair, a table, a sink, a bench, a footrest, and an outlet that is appropriately placed for a breast pump. These clean, private suites can be found at Gates C9, E33, and A10.

Yes. The USO at BOS proudly welcomes active-duty service members of the US military and their families. The lounge is located in Terminal C, before security, on the lower level, toward Terminal E. Amenities at this lounge include comfortable seating around a TV with DVDs and Xbox games, a kitchen area, internet access, computers, emergency personal-care kits, reference materials about Boston, and so much more. This USO is open from 8 am until 9 pm Monday thru Friday and from 8 am to 8 pm on Saturday and Sunday.

STL provides travelers and staff alike with two interfaith chapels. The chapels provide prayer books, prayer rugs, and services that include empathetic listening, spiritual guidance, and religious services. Open and available 24/7, one chapel is located on the lower level of Terminal 1 and the other is at Gate E40.

American Airlines, JetBlue, and Southwest are among the airlines that operate direct flights between BOS and STL. American Airlines and Delta are among the airlines that offer flights between BOS and STL that have one-stop. Layover cities include Philadelphia (PHL), Washington DC (DCA), and Charlotte (CLT). United Airlines is one of the carriers that operate flights between STL and BOS that have two stops. Layover cities include Newark (EWR) and Chicago (ORD).

Among airlines operating Boston to St. Louis flights:

• Southwest: offers free seat selection
• American Airlines: offers extra legroom; offers free seat selection

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

2 airlines operate flights between Boston and St. Louis. The airlines offering nonstop flights on this route include:

• Southwest
• American Airlines

Flights from Boston to St. Louis usually depart from Boston Logan Intl (BOS) 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
• American Airlines: 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.

Three cabin classes are available on flights from Boston to St. Louis:

• Economy Class
• Business Class
• First Class

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $236 round-trip via Fort Lauderdale (FLL), compared to $502 for nonstop.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $45–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

The Embraer 175 family is used most often on this route, operated mainly by American Airlines. Other aircraft seen on the route include Boeing 737 MAX 8 variants.

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

• Atlanta Hartsfield-Jackson (ATL) - 35% of one-stop connections
• Orlando (MCO) - 17% of one-stop connections
• Detroit Metropolitan Wayne County (DTW) - 13% of one-stop connections
• Chicago O'Hare Intl (ORD) - 11% of one-stop connections

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

On the Boston to St. Louis route, being flexible with your departure day can save you up to 24%. Saturday is the cheapest day at $439 round-trip on average, while Monday is the most expensive at $576: a $137 difference. Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

A flight is considered delayed when it departs 15 minutes or more after its scheduled time. This is the standard used by the US Department of Transportation and most airline industry reporting. On the Boston to St. Louis route, 21% of flights were delayed in the past 3 months, with delays averaging 2 hours 30 minutes.

Morning is the busiest departure period on Boston to St. Louis flights, with 40% of flights leaving in that window. Afternoon departures account for 40%, evening flights for 20%, and night flights for 0%.

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 Boston to St. Louis:

• Earliest: departs at 5:00 am and lands at 8:07 am
• Latest: departs at 7:55 pm and lands at 11:02 pm.

The flight takes about 3h 07m.

Last-minute fares on this route - booked within 2 weeks of departure - run 57% above the route average of $495. Book 12 weeks before departure for the lowest fares.

A nonstop flight from Boston to St. Louis takes 3h 07m, covering 1,043 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.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $341 to $1,944. That means the highest observed fare was about 6x higher than the lowest one.

One-way fares from Boston to St. Louis are currently lower than usual. Average one-way flight prices are about $148, which is 47% below the typical average for this route.

Night flights have the fewest delays on this route. Delays tend to pile up throughout the day as one late flight pushes the next, so earlier departures are usually more reliable.

Flying via Detroit Metropolitan Wayne County (DTW) gives the shortest average 1-stop total travel time at 4h 56m, compared with 5h 12m via Newark (EWR) and 5h 16m via Chicago O'Hare Intl (ORD).

St. Louis is 1 hour behind Boston (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 Boston to St. Louis range from $405 to $615, with an average of $495 over the past 12 months. Anything below $405 counts as a good deal.

Two airlines offer in-flight Wi-Fi on Boston to St. Louis flights:

• • American Airlines
• • JetBlue