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Cheap flights from Boston to St Louis (BOS - STL)

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The best prices from Boston to St Louis are usually found in January or June, booked 42 days in advance, depart on a Thursday or Friday and return on a Thursday

How to find the cheapest flight from
Boston (BOS) to St Louis (STL)

BOS - STL
Price
$188 - $264
STL
Temperature
44.6 - 89.6 °F
STL
Rainfall
2.2 - 5.1 inches

Popular in

September

High demand for flights, 13% potential price rise

Cheapest in

January

Best time to find cheap flights, 18% potential price drop

Round-trip from

$188

From Boston to St Louis

One-way from

$101

One-way flight from Boston to St Louis

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly round-trip from Boston to St Louis?

Users have found that leaving on a Wednesday can be a cost-effective option. It’s possible to save up to 32% on your flight compared to booking on days when demand is much higher.

How far in advance should I book a flight from Boston to St Louis?

To save up to 96% on this flight, we recommend booking at least 31 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Boston to St Louis from $374 1-2 weeks out and tickets from $553 for flights departing within the next 72 hours.

What is the cheapest month to fly from Boston to St Louis?

August is one of the best times of the year to fly to St Louis from Boston. Prices for August average $266 per person but you can even find prices for as low as $158. The most expensive prices can be found in the month of December. Opting for a August flight can save you 23% on your journey compared to booking in August

When is the cheapest time to fly from Boston to St Louis (BOS - STL)?

It’s typically best to fly out from Boston to St Louis in the afternoon. Doing so could potentially save you 13% on the flight price compared to flying in the evening, which is usually more expensive.

Cheap flights from Boston to St Louis in December, January 2021

The best prices found for BOS to STL flights for December, January
18 Jan - 23 Jan
$78pp
BOS
Boston Logan Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
BOS
Boston Logan Intl
15 Jan - 23 Jan
$79pp
BOS
Boston Logan Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
BOS
Boston Logan Intl
18 Jan - 25 Jan
$110pp
BOS
Boston Logan Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
BOS
Boston Logan Intl

Boston to St Louis 2021 flight deals

Cheap flights to St Louis from Boston found for this year
17 Dec - 22 Jan
$135pp
BOS
Boston Logan Intl
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Multiple Airlines
   
2 STOPS
BOS
Boston Logan Intl
7 Dec - 15 Dec
$136pp
BOS
Boston Logan Intl
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
BOS
Boston Logan Intl
31 Dec - 7 Jan
$139pp
BOS
Boston Logan Intl
Multiple Airlines
     
3 STOPS
STL
Lambert-St Louis
STL
Lambert-St Louis
Multiple Airlines
   
2 STOPS
BOS
Boston Logan Intl

Last minute flights from Boston to St Louis

Late deals on round-trip flights to St Louis from Boston, departing today and this week
7 Dec - 15 Dec
$136pp
BOS
Boston Logan Intl
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
BOS
Boston Logan Intl
8 Dec - 13 Dec
$140pp
BOS
Boston Logan Intl
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
BOS
Boston Logan Intl
8 Dec - 15 Dec
$145pp
BOS
Boston Logan Intl
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
BOS
Boston Logan Intl

One-way flights to St Louis from Boston

The cheapest one-way flights from Boston to St Louis
7:20 am - 5:42 am
Frontier
2 Stops
23h 22m
BOS - STL
Frontier
$101
Gotogate
2:00 pm - 6:08 pm
American Airlines
1 Stop
5h 08m
BOS - STL
American Airlines
1:00 am - 1:16 pm
Multiple Airlines
2 Stops
13h 16m
BOS - STL
Multiple Airlines
$112
Gotogate

Related info for your journey

Useful info, stats and facts about Boston to St Louis flights.

Flight FAQs

From Boston to St Louis

Are flight prices decreasing from Boston to St Louis due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Boston and St Louis for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

What safety measures are being taken by airlines flying from Boston Logan Intl to Lambert-St Louis to control the spread of COVID-19?

Delta is one of the many airlines that have implemented additional safety measures to control the spread of COVID-19. Airline carriers are regularly disinfecting and sanitizing their aircraft. Masks are provided and are mandatory while on board. Pre-flight testing for symptoms and antibodies, alongside socially distanced seating (for a limited time) will work towards keeping travelers safer while flying from Boston Logan Intl to Lambert-St Louis. Policies will vary by airline.

Which airlines flying from Boston Logan Intl to Lambert-St Louis have flexible cancellations due to COVID-19?

Due to the rapidly changing circumstances due to COVID-19, airlines like American Airlines, Delta, and United Airlines flying from Boston Logan Intl to Lambert-St Louis have implemented new flexible cancellation policies.

Can I find flights from Boston to St Louis for under $100 on Cheapflights?

Yes, there are multiple flights from Boston to St Louis for under $100. The cheapest flight booked recently is on Frontier for just $78, but on average you can expect to pay $119.

Are there nonstop flights from Boston to St Louis for under $100 on Cheapflights?

There are no nonstop flights from Boston to St Louis, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.

Are there last-minute flights available from Boston to St Louis for under $200?

There are currently 20+ open flights from Boston to St Louis within the next 7 days for less than $200.

How popular is this flight route?

Flights from Boston Logan Intl to Lambert-St Louis have been viewed 48 times in the past calendar month.

Does it rain more in Boston or St Louis?

The rainfall in Boston is generally less than the rainfall in St Louis. This will continue over the next 14 days.

Is Boston weather warmer or cooler than St Louis?

Expect the weather to be around 90 °F on average in July. As the temperature peaks, try to get your plans done early, as flight price and availability will have an impact on your travels. The climate in St Louis is generally hotter than in Boston.

How long is the flight from Boston to St Louis?

There are many flights that can get you from Boston to St Louis in 7h 54m. Fly via Frontier to get the fastest option.

What is the cheapest airline to fly from Boston to St Louis round-trip?

According to our current data, Frontier ($78), offers the cheapest pricing from Boston to St Louis. Users have found that Frontier is 65% cheaper than the other options available to this destination.

What are the cheapest airlines to fly from Boston to St Louis one-way?

The cheapest airlines for a one-way flight from Boston to St Louis are Frontier ($34) and American Airlines ($102).

Alternative routes for Boston to St Louis

Destination information for St Louis

Things to know before you go. Useful info for your trip from Boston to St Louis
Average temperature for December in St Louis
46.4 °F
Avg rainfall for December in St Louis
2.5 ″

Airports servicing Boston

Airports servicing St. Louis

Top 5 airlines from Boston to St Louis

The chart below displays the airlines Cheapflights users traveling from Boston to St Louis choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.

Airline Cheapest Average Flexibility On-time COVID-19 safety
Frontier
$77 $234 No cancel fee 62%
United Airlines
$92 $263 No cancel fee 69%
American Airlines
$92 $278 No cancel fee 71%
Delta
$97 $278 No cancel fee N/A
Southwest
$398 $593 No cancel fee 63%

Hourly flight availability from Boston to St Louis

Morning 6 AM to noon 50% of BOS to STL departures
Afternoon Noon to 6 PM 50% of BOS to STL departures
Early morning Midnight to 6 AM 0% of BOS to STL departures
Evening 6 PM to midnight 0% of BOS to STL departures
Midnight
6 AM
Noon
6 PM
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