Cheap flights from St. Louis to Boston from $129

In general, December is the cheapest month to fly from St. Louis to Boston. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $438. If you aren’t able to travel during the month of December, then book flights to Boston from St. Louis during April instead. Flights to Boston in April, while not as cheap as those in December, still average around $452.

The cheapest day to depart from St. Louis to Boston is on a Wednesday when prices can be found for as low as $500. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to Boston on Saturday is $684.

According to our data, the cheapest time of day to fly to Boston is in the afternoon. momondo users have found flights departing from St. Louis to Boston in the afternoon for as low as $514. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. At noon is when there is more demand to fly to Boston, so prices are often more expensive at around $921 per ticket.

Fly from Lambert-St Louis to Boston Logan Intl for the best Lambert-St Louis - Boston Logan Intl flight prices

You are more likely to see cheaper flights to Boston from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Boston for around $496 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Boston from St. Louis for as low as $427 on momondo.

There are 4 cabin classes available to choose from on St. Louis to Boston flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

No. A direct flight is the cheapest option for a flight between St. Louis to Boston.

As of September 2026, prices for St. Louis to Boston flights are approximately 62% more expensive when compared to flights at the same time last year.

Delta, United Airlines, and Southwest are the most popular carriers operating from Lambert-St Louis to Boston Logan Intl

American Airlines, Southwest and Frontier are the top three most popular airlines that fly to Boston from St. Louis according to our data. American Airlines is the first choice among our users, with 50% of people opting to fly with this airline when traveling to Boston. Keep in mind that there are 6 different airlines that fly to Boston on a routine basis, so you have a few additional options to choose from.

Philadelphia (PHL) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

Flights via Atlanta (ATL) offer the lowest average round-trip price of $230.

Flights connecting via Philadelphia (PHL) have the shortest average one-way travel time: 5h 18m.

Philadelphia (PHL) has the shortest average layover time for this route: 1h 18m.

3 flights are operational daily from St. Louis to Boston as of September 2026. The most popular departure time for this route is 9:00AM, with 52% of flights per day taking off at noon.

As of September 2026, there are 26 flights per week flying from St. Louis to Boston. The most common day of the week flights depart is Tue, with 35% of flights taking off on this day.