Cheap flights from Boston to St. Louis from $83
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to St. Louis departing on 9/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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American Airlines flights from Boston to St. Louis
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Frontier flights from Boston to St. Louis
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How to get the cheapest flight ticket from Boston to St. Louis
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to St. Louis?
In general, September is the cheapest month to fly from Boston to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $373. The month of August is another great option to travel to St. Louis, with average flight prices from Boston averaging around $391.
What is the cheapest day to depart on your flight to St. Louis?
The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $421. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $507. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.
What is the cheapest time of day to depart on your flight to St. Louis?
Flying to St. Louis from Boston in the evening is the least expensive time of day to depart. momondo users have found prices as low as $427 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $458 per ticket.
What is the cheapest Boston Logan Intl to Lambert-St Louis flight route?
Fly from Boston Logan Intl to Lambert-St Louis for the best Boston Logan Intl - Lambert-St Louis flight prices
How far in advance should I book a flight to St. Louis?
You are more likely to see cheaper flights to St. Louis from Boston when booking 9 weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $434 when searching 9 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Boston for as low as $384 on momondo.
What cabin class options are available on Boston Logan Intl to Lambert-St Louis flights?
There are 4 cabin classes available to choose from on Boston Logan Intl to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Boston Logan Intl to Lambert-St Louis?
Spirit Airlines, American Airlines, and Southwest are the most popular carriers operating from Boston Logan Intl to Lambert-St Louis
What airlines fly to St. Louis?
American Airlines, Southwest and Delta are the top three most popular airlines that fly to St. Louis from Boston according to our data. American Airlines is the first choice among our users, with 60% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 6 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.
How many flights depart from Boston to St. Louis on average per day?
As of June 2025, there are 4 flights per day flying from Boston to St. Louis. The most common time of day flights depart is 7:00AM, with 51% of flights taking off at noon.
How many flights depart from Boston to St. Louis on average per week?
33 flights are operational weekly from Boston to St. Louis as of June 2025. The most popular departure day for this route is Mon, with 18% of flights per week taking off on this day.
When to book flights from Boston to St. Louis
Cheap Boston to St. Louis (BOS to STL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Boston to St. Louis
How far is Boston Logan Intl to Lambert-St Louis by plane?
Lambert-St Louis is 1035.0 mi away from Boston Logan Intl. Flights usually cover this in 2h 50m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Boston Logan Intl Airport to Lambert-St Louis Airport?
Prices for flights from Boston Logan Intl Airport to Lambert-St Louis Airport were last updated today.
How many operators does momondo search for flights from Boston Logan Intl Airport to Lambert-St Louis Airport?
As of June 2025, there are 6 operators available to choose from for flights from Boston Logan Intl Airport to Lambert-St Louis Airport.
How old do you have to be to fly from Boston Logan Intl Airport to Lambert-St Louis Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Boston Logan Intl Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Boston to St. Louis?
momondo data reveals that the most frequently booked plane model on the route from Boston to St. Louis is Embraer 175, representing 29.51% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 23.31%, Boeing 737-700 Passenger/BBJ1 (winglets) at 13.64%, and Boeing 737 MAX 8 at 11.76%.
What is the most popular airline from Boston to St. Louis?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Boston to St. Louis is American Airlines (58% of total bookings). The next most popular airlines are Southwest (30%), Delta (7%), and Frontier (3%).
Best airlines flying from Boston to St. Louis
Compare and see reviews for airlines that fly from Boston to St. Louis with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $107 | Free Cancellation | Rating 6.3 8,052 reviews | |||
| PriceFrom $113 | Free Cancellation | Rating 5.9 3,295 reviews | |||
| PriceFrom $196 | Free Cancellation | Rating 8.0 7,950 reviews | |||
| PriceFrom $257 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom $290 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $333 | Free Cancellation | Rating 8.0 4,287 reviews |
Southwest Flights From Boston to St. Louis
Southwest operates around 15 flights from Boston to St. Louis every week. The average price of these flights found in the last 72 hours has been $458, but momondo users have found Southwest deals from Boston to St. Louis from as low as $333 round-trip. Southwest has been scored 8.0/10 in 4,287 reviews.
American Airlines Flights From Boston to St. Louis
The best American Airlines deal for Boston to St. Louis flight tickets found on momondo in the last 72 hours was $290, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at $445 round-trip. American Airlines operates 12 flights out of Boston into St. Louis in an average week, so prices vary by time and availability. 10,000 American Airlines reviews by users on momondo have scored the airline at 7.2/10.
Traveling to a place near St. Louis?
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Why should I use momondo to find a flight deal from Boston to St. Louis?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Boston to St. Louis for you.
Can I find flights from Boston to St. Louis with flexible booking policies on momondo?
Yes. All flights to St. Louis from Boston on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from Boston to St. Louis?
momondo helps you find the best flight between Boston and St. Louis by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.
I’m not ready to book a flight from Boston to St. Louis right now. Can momondo alert me if prices change?
Yes momondo offers price alerts on flights to St. Louis from Boston. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.