Cheap Flights from St. Louis to Boston from S$ 160

Frequently Asked Questions

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

  Based on Trip.com data, Frontier Airlines offers Cheapest nonstop one-way flights from S$ 160 (for example, STL–BOS on Sat, Nov 21). For a Cheapest nonstop return flight, American Airlines offers fares from S$ 381, departing on Wed, Nov 4 and returning on Sat, Nov 7.

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

  At the moment, you can catch a direct 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 (STL) to Boston (BOS)?

  It takes about 2 hours 50 minutes to fly from St. Louis (STL) to Boston (BOS).

• 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 many flights are there from St. Louis to Boston each week?

  On average, 31 direct flights operate each week between St. Louis and Boston. See below the schedules of the main airlines serving this route:
  American Airlines: S/M/T/W/T/-/S – AA3546 (departure at 09:04)

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

  Here are some tips for finding the best flight deals from St. Louis to Boston on Trip.com:
  · Be flexible with your travel dates. The cheapest flight is currently on Sat, Nov 21, with one-way fares from just S$ 160.
  · Compare airlines. Frontier Airlines currently offers the lowest fares on this route.
  · Set up a price alert to track fare changes without searching every day.
  · Check Trip.com regularly for flight deals and available promo codes.
  · Avoid peak season or book early. July is generally the busiest month for travel to Boston.
  · Get exclusive promo codes on the Trip.com app.

• When is the best time to book a flight from St. Louis to Boston to get the best price?

  The cheapest month to book a flight from St. Louis to Boston is usually October, when demand is lower.

• Which upcoming date is the cheapest for flights from St. Louis to Boston?

  After crunching the numbers on our October flight calendar, it's currently cheapest to fly from St. Louis to Boston on October 17, 2026 with Frontier Airlines, with prices starting at S$ 149.

• Which airports should you choose for flights from St. Louis to Boston?

  Flights to Boston can arrive at: Boston Logan International Airport (BOS), Hartford Barnes Airport (BNH) and Portsmouth International Airport (PSM). The most common route connects St. Louis Lambert International Airport and Boston Logan International Airport (STL–BOS).

• What is the time difference between St. Louis and Boston?

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

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

  Tickets can only be changed or cancelled 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.

• What is the average cost of a one-way flight from St. Louis to Boston?

  Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from St. Louis to Boston is S$ 330. Fares vary by travel date, airline and availability.

• What is the average cost of a round-trip flight from St. Louis to Boston?

  Based on Trip.com data for travel in the next 30 days, the average round-trip fare from St. Louis to Boston is S$ 622. The final price depends on the outbound and return dates, airline and fare conditions.

• How do I book flights from St. Louis to Boston on Trip.com?

  Enter St. Louis and Boston, choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveller details and complete payment to receive your confirmation.