The cheapest times to fly from SEA to BOS are
- January 1st to March 11th
- April 16th to May 6th
- September 3rd to November 18th
based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from SEA to BOS is late January and early February. Prices can be as high as $1100 for Sunday flights during early August, or as low as $217 for Tuesday flights around late January and early February.
When to Fly to Boston
Flying from Seattle, WA (SEA) to Boston, MA (BOS) will usually cost between $217 to $520 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late January and early February with an average ticket price of $217. Due to high demand the most expensive time to fly is early August, with an average price of $552. Planning your trip to low-cost times can easily save you $335 on economy flights and even more on first-class flights. Generally, any price below $279 can be considered a good price for a round-trip SEA to BOS flight.
See below for a graph of average weekly prices for the SEA to BOS route. All prices are for round-trip tickets in USD.
Compared to other flights, the SEA to BOS flight is much cheaper than the average and costs much less than the average flight leaving from Seattle. The average price per mile (for a direct flight) is $0.07, which is far below average.
Flight Prices by Day of the Week
Tuesday is usually the cheapest day to depart and return on this flight. Sundays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $90 (25%) on this flight.
Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $275. Return trip prices are from the BOS to SEA flight, and often highlight the quality of our data in showing the same trend.
Departing Prices by Day
Return Trip Prices by Day
Nonstop Flights and Layovers
Travelers looking to fly from SEA to BOS can generally find a 0-layover flight. Because there is a direct flight option the real-world direct flight time of 5 hour 28 minutes may be realistic.
Flight Questions Answered
Still have questions about flying from SEA to BOS? We’ve got answers.
Which airlines fly this route?
You can find 15 major airlines flying this route most often: Air Europa, Alaska, American, China Eastern, Delta, Emirates, Fiji Airways, Frontier, JetBlue, Qatar Airways, Singapore Airlines, Southwest, Spirit, Sun Country Airlines, United, and potentially more during busy seasons.
How far away is it from Logan International Airport to Seattle/Tacoma International Airport?
The distance between the two airports is roughly 2489 miles or 4006 kilometers.
How long does it take to fly from SEA to BOS?
The real-world flight time for a nonstop SEA to BOS flight is about 5 hour 28 minutes.
How many flights go between Seattle, WA and Boston, MA?
It depends on the day of the week and the date, but a typical day might have around 97 available flights from SEA to BOS.
Airport Location Info
|Origination airport name||Seattle/Tacoma International Airport|
|Country||the United States|
|Destination airport name||Logan International Airport|
|Country||the United States|
Late and Early Flight Data
Flights from SEA to BOS tend to depart as late as the average flight. According to our recently updated data, 29% of flights departed 5 or more minutes late, and 17% of flights left 5 or more minutes early. On average you can expect to leave BOS heading for SEA about 17 minutes late. This does significantly impact arrival time, as the average landing time in Boston, MA is about 2 minutes late. The numbers below show a recent average of take-off times versus the scheduled departure flight:
- Delta: 13 minutes late
- JetBlue: 41 minutes late
- Alaska: 4 minutes late
- Some airlines not reporting
Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.