Cheap Flights from Boston Logan International to St Louis

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Compare Boston Logan International to St Louis flight deals

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Flight deals from Boston Logan International to St Louis

Looking for a cheap last-minute deal or the best return flight from Boston Logan International Airport to St Louis Airport? If you want to travel next month, return fares start from $460. Find the lowest prices on one-way and return tickets right here.

St Louis.$443 per passenger.Departing Thu, 10 Dec, returning Thu, 17 Dec.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Boston Logan International on Thu, 10 Dec, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Thu, 17 Dec, arriving in Boston Logan International.Price includes taxes and charges.From $443, select.

St Louis.$460 per passenger.Departing Thu, 15 Oct, returning Sat, 17 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Boston Logan International on Thu, 15 Oct, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sat, 17 Oct, arriving in Boston Logan International.Price includes taxes and charges.From $460, select.

St Louis.$478 per passenger.Departing Fri, 20 Nov, returning Mon, 23 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Boston Logan International on Fri, 20 Nov, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 23 Nov, arriving in Boston Logan International.Price includes taxes and charges.From $478, select.

St Louis.$481 per passenger.Departing Thu, 24 Sep, returning Fri, 25 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Boston Logan International on Thu, 24 Sep, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 25 Sep, arriving in Boston Logan International.Price includes taxes and charges.From $481, select.

St Louis.$509 per passenger.Departing Sat, 14 Nov, returning Thu, 3 Dec.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Boston Logan International on Sat, 14 Nov, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Thu, 3 Dec, arriving in Boston Logan International.Price includes taxes and charges.From $509, select.

St Louis.$509 per passenger.Departing Tue, 5 Jan, returning Thu, 7 Jan.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Boston Logan International on Tue, 5 Jan, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Thu, 7 Jan, arriving in Boston Logan International.Price includes taxes and charges.From $509, select.

St Louis.$509 per passenger.Departing Sat, 7 Nov, returning Mon, 9 Nov.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Boston Logan International on Sat, 7 Nov, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Mon, 9 Nov, arriving in Boston Logan International.Price includes taxes and charges.From $509, select.

St Louis.$509 per passenger.Departing Tue, 20 Oct, returning Mon, 26 Oct.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Boston Logan International on Tue, 20 Oct, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Mon, 26 Oct, arriving in Boston Logan International.Price includes taxes and charges.From $509, select.

St Louis.$510 per passenger.Departing Wed, 2 Dec, returning Sat, 5 Dec.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Boston Logan International on Wed, 2 Dec, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Sat, 5 Dec, arriving in Boston Logan International.Price includes taxes and charges.From $510, select.

St Louis.$542 per passenger.Departing Wed, 30 Sep, returning Sat, 3 Oct.Return flight with Delta.Outbound indirect flight with Delta, departs from Boston Logan International on Wed, 30 Sep, arriving in St Louis.Inbound indirect flight with Delta, departs from St Louis on Sat, 3 Oct, arriving in Boston Logan International.Price includes taxes and charges.From $542, select.

St Louis.$561 per passenger.Departing Fri, 30 Oct, returning Mon, 2 Nov.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Boston Logan International on Fri, 30 Oct, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Mon, 2 Nov, arriving in Boston Logan International.Price includes taxes and charges.From $561, select.

St Louis.$731 per passenger.Departing Tue, 9 Feb, returning Tue, 16 Feb.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Boston Logan International on Tue, 9 Feb, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Tue, 16 Feb, arriving in Boston Logan International.Price includes taxes and charges.From $731, select.

St Louis.$752 per passenger.Departing Sat, 26 Sep, returning Wed, 30 Sep.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Boston Logan International on Sat, 26 Sep, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Wed, 30 Sep, arriving in Boston Logan International.Price includes taxes and charges.From $752, select.

St Louis.$753 per passenger.Departing Sat, 26 Sep, returning Tue, 6 Oct.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Boston Logan International on Sat, 26 Sep, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Tue, 6 Oct, arriving in Boston Logan International.Price includes taxes and charges.From $753, select.

St Louis.$795 per passenger.Departing Thu, 31 Dec, returning Sat, 2 Jan.Return flight with United.Outbound indirect flight with United, departs from Boston Logan International on Thu, 31 Dec, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Sat, 2 Jan, arriving in Boston Logan International.Price includes taxes and charges.From $795, select.

St Louis.$837 per passenger.Departing Sun, 27 Dec, returning Fri, 1 Jan.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Boston Logan International on Sun, 27 Dec, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Fri, 1 Jan, arriving in Boston Logan International.Price includes taxes and charges.From $837, select.

Find the cheapest month to fly from Boston Logan International to St Louis

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Boston Logan International to St Louis flights are currently cheapest in December.

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Direct flights from Boston Logan International to St Louis

Boston Logan International to St Louis: Alternative routes

Compare routes from Boston Logan International to St Louis below. You may find an airport to fly into that's cheaper, faster, or easier than St Louis.

St Louis

20km from central St Louis

ClosestCheapest

from $443

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Belleville

32km from central St Louis

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Boston to St Louis: Flight information

The things to know before you go.

Cheapest flight found	$443
Cheapest month to fly	December
Average flight time	3 hrs, 10 mins
Most popular airline	Southwest Airlines
Average flights per week	61

Finding cheap flights from Boston Logan International to St Louis: Frequently asked questions

How much are return flights from Boston Logan International to St Louis?

The best price we found for a return flight from Boston Logan International to St Louis is $443. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from Boston Logan International to St Louis?

3 hours and 10 minutes is the average flight time from Boston Logan International to St Louis.

Which airlines fly direct from Boston Logan International to St Louis?

Southwest Airlines, American Airlines and Republic Airways fly direct from Boston Logan International to St Louis.

How many flights are there a week from Boston Logan International to St Louis?

As of September 2026, there are 61 flights per week flying from Boston Logan International to St Louis.

When is the cheapest time to fly from Boston Logan International to St Louis?

The cheapest month to fly from Boston Logan International to St Louis is usually December.

Which upcoming date is cheapest to fly from Boston Logan International Airport to St Louis Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Boston Logan International Airport to St Louis Airport on Thursday, 10 December 2026.

Can I get a direct flight from Boston Logan International Airport to St Louis Airport?

Yes – the average flight time is 3 hours and 10 minutes.

How can I find the best flight deal to St Louis?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to St Louis but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to St Louis?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to St Louis is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from Boston Logan International Airport to St Louis with?

Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to St Louis.

Flying from Boston Logan International Airport (BOS) to St Louis Airport (STL): what you need to know

Around 3 hours 10 minutes is how long you can expect to be in the air on a direct flight from Boston Logan International Airport to St Louis Airport.
St Louis is one hour behind Boston and is in the UTC-6 timezone.
Choose from 25 weekly Boston Logan International Airport to St Louis Airport flights. The 05:35 departure with Southwest Airlines is the earliest flight you can take. Southwest Airlines operates the last service of the day at 19:40.
To ensure you catch your BOS to STL flight, allow plenty of time to check in and drop off your luggage. Arriving two hours before international departures and one hour before domestic flights is the standard rule.
Flying during a peak month like July? Major public holidays and other popular periods can mean longer lines and delays at security. Be extra cautious and get there up to four hours ahead of international flights and two hours before domestic departures.
Travelling to St Louis (and then exploring more of the United States!) is easy with American Airlines. This popular carrier has direct flights from Boston Logan International Airport to St Louis Airport.
American Airlines is the airline with the highest passenger demand for this route.
With an impressive 80.88% of services arriving as scheduled, American Airlines has the best on-time performance for BOS to STL flights.
If you'd like to split up your journey, just deselect 'Direct flights only' when searching for your ticket from Boston Logan International Airport to St Louis Airport. Here are the most popular stopovers between BOS and STL:
- Detroit Wayne County Airport
- Washington Ronald Reagan Airport
- Chicago Midway Airport

How to find the cheapest flights from Boston Logan International Airport (BOS) to St Louis Airport (STL)

$221 is currently the lowest price for a one-way Boston Logan International Airport to St Louis Airport flight. A return flight starts from $443. These prices may change based on availability.
To score cheap tickets from BOS to STL, book your journey four months before your departure.
September is the cheapest month for flights from Boston Logan International Airport to St Louis Airport. If you prefer to fly at a different time of year, the 'Whole month' tool will show you the lowest airfares for every month.
You don't need to check back in every day to find out if fares have dropped when you create a Price Alert. We'll let you know as soon as there's a change in price on cheap flights from BOS to STL.
Tailor your trip using filters. Choose your preferred departure and arrival times, total journey duration and airlines. You can also sort results by 'Cheapest,' 'Best' or 'Fastest' flights from Boston Logan International Airport to St Louis Airport.

Handy information about Boston Logan International Airport (BOS)

BOS's address is One Harborside Drive.
75% of flights departing from Boston Logan International Airport reach their destination on time.
Boston Logan International Airport is about 8 kilometres from central Boston. If you're driving, ride-sharing or catching a taxi from the centre, it'll take 20 minutes or so to get there, depending on the traffic.
The trip when using public transport takes about 25 minutes.
Get your holiday off to a leisurely start by staying near BOS. Whether you're catching an early flight from Boston Logan International Airport to St Louis Airport or just don't want to be rushed, these stays are ideal:

Arriving at St Louis Airport (STL)

The last thing you need is a long journey to your hotel if you're arriving on a late Boston Logan International Airport to St Louis Airport flight. Stay at one of these accommodation options near STL instead:
Fast-track your adventure by picking up a St Louis Airport rental car. Grab your wheels from Hertz, Budget or Alamo and explore beyond St Louis's usual tourist stops.
Reserving your vehicle from St Louis Airport around one week ahead gives you the best chance of locking in a great deal.

When to fly to St Louis Airport (STL)

July is the busiest month for flights from Boston Logan International Airport to St Louis Airport. To skip the crowds, visit St Louis in March.
Before locking in your flight from Boston Logan International Airport to St Louis Airport, think about the type of weather you like. July is the warmest month in St Louis, with temperatures ranging from 17ºC to 33ºC.
Look for cheap tickets from BOS to STL in January if you like travelling in cooler conditions. Temperatures are at their lowest then, ranging between -7ºC and 8ºC on average.

Explore more of the United States

You've visited St Louis, now it's time to explore other parts of the United States. Journey around 418 kilometres north-east to Chicago to check off its must-visit sights. From Millennium Park to Art Institute of Chicago and Willis Tower, your itinerary will be busy.
Indianapolis is another well-known destination in the United States and is around 370 kilometres east of St Louis. No journey is complete without visiting Lucas Oil Stadium, Eiteljorg Museum and The Children's Museum of Indianapolis.