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Find cheap one-way flights from Boston to Seattle starting at US$90.

We've found these cheap flights for you. You can book one-way or round-trip flight tickets.

  • One way
  • Round-trip

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

When is the cheapest time to book flights from Boston to Seattle?

We monitor flight fares to help you find the best deals effortlessly

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.
Cheapest airlines flights from Boston to Seattle

Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Sun Country Airlines
From US$90
Spirit Airlines
From US$107
Alaska Airlines
From US$113
Southwest Airlines
From US$114
Delta Air Lines
From US$115
Frontier Airlines
From US$118
United Airlines
From US$183
American Airlines
From US$298
Jetblue Airways
From US$322
Hawaiian Airlines
From US$564
ANA airlines

Find more flights and airlines

Find cheap flights from Boston to Seattle by different airports

Searching for potential routes that might be cheaper and faster? Check out these alternative flights from Boston to Seattle.

  • Cheapest
    Sun Country Airlines
    BOS
    11:30
    8h 25m
    1 transfer
    SEA
    16:55
    General Edward Lawrence Logan International Airport - Seattle-Tacoma International Airport
    Wed, Apr 24Sun Country Airlines
    US$90
  • Southern Airways Express
    BNH
    10:00
    15h 30m
    1 transfer
    SEA
    22:30
    Hartford Barnes Airport - Seattle-Tacoma International Airport
    Tue, Apr 16Southern Airways Express
    US$569
  • Southern Airways Express
    BNH
    10:00
    15h 30m
    1 transfer
    SEA
    22:30
    Hartford Barnes Airport - Seattle-Tacoma International Airport
    Tue, Apr 16Southern Airways Express
    US$569
    Find More Flights

Frequently Asked Questions

  • When are flight tickets from Boston (BOS) to Seattle (SEA) the cheapest?

    Airlines adjust prices for flights from Boston to Seattle based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.
  • How much do flights from Boston (BOS) to Seattle (SEA) cost?

    According to Trip.com's data, the lowest price is around $464.
  • How long does it take to fly from Boston (BOS) to Seattle (SEA) and what is the distance?

    It takes around 6 hours 18 minutes to fly from Boston (BOS) to Seattle (SEA).
  • What is the transportation method from the main airport to downtown in Seattle?

    • The distance from Seattle-Tacoma International Airport to downtown is about 17km. It takes about 30 minutes by taxi.
  • What are the most popular airlines that fly from Boston (BOS) to Seattle (SEA)?

Boston to Seattle Flight Information

Cheapest nonstop flight price

$89

Cheapest round-trip ticket price

$203

Off-season for travel

November

Peak season for travel

September