Cheap Flights from St. Louis to Boston from US$111

Frequently Asked Questions

• What are the cheapest flights from St. Louis to Boston (STL-BOS)?

  Based on Trip.com data, Frontier Airlines offers one-way fares as low as US$111 on Cheapest nonstop routes (e.g. STL to BOS on Tue, Aug 18), while Frontier Airlines offers Cheapest nonstop round-trips from US$267 departing on Sat, Jul 18 and returning on Wed, Jul 22.

• Which airlines offer direct flights from St. Louis to Boston?

  At the moment, you can catch a nonstop flight from St. Louis to Boston with the following airlines, including: American Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• How long is a flight from St. Louis to Boston?

  It takes about 2 hours 40 minutes to fly from St. Louis to Boston.

• When is the best time to book flights from St. Louis to Boston?

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from St. Louis to Boston is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

• How can I find the best deals on flights from St. Louis to Boston?

  To find best deals on flights from St. Louis to Boston, you can use various tools on Trip.com:
  · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Tue, Aug 18, with one-way flights priced at just US$111.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Frontier Airlines.
  · Set up price alerts to easily monitor ticket prices without having to check every day.
  · Check Trip.com flight deals and promo codes frequently.
  · Avoid peak season unless you book very early. It seems the peak season for Boston travel is around July.
  · Get exclusive promo codes for Trip.com app users.

• When are flight tickets from St. Louis (STL) to Boston (BOS) the cheapest?

  The cheapest months to fly from St. Louis to Boston is October, when demand for travel is lower.

• Which upcoming date is cheapest to fly from St. Louis to Boston on?

  After crunching the numbers on our July flight calendar, it's currently cheapest to fly from St. Louis to Boston on July 11, 2026 with Frontier Airlines, with prices starting at US$113.

• Which airports can I fly to for Boston from St. Louis?

  You can land at any one of the following hubs in Boston, with St. Louis Lambert International Airport to Boston Logan International Airport (STL-BOS) is by far the most common option on this route: Hartford Barnes Airport (BNH) Boston Logan International Airport (BOS) Portsmouth International Airport (PSM).

• Is there any time difference between St. Louis and Boston?

  The time difference between Boston and St. Louis is 1h.

• How do I change or cancel my ticket from St. Louis to Boston?

  Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.