- Cheapest roundtrip flight
- from€455
- Fastest outbound flight
- Fastest inbound flight
- non-stop flights
- 46x / week
- Flight distance
- 4,010 km
- Time difference
- Most popular airlines
- Alaska Airlines
- Delta Air Lines
- Alaska Airlines
Flight schedule from Boston (BOS) to Seattle-Tacoma (SEA)
Select a travel date in the flight schedule for the route from Boston (BOS) to Seattle-Tacoma (SEA) and compare affordable flight deals.
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Matching outbound flightsBOS–SEA · 19 of 19
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- September 13 – 19, 2026
- September 20 – 26, 2026
- Sep 27 – Oct 3, 2026
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Tips and tricks to help you find cheap flights from Boston to Seattle Tacoma
Favorite airline: e.g. Alaska Airlines, Spirit Airlines
Flight tickets on the route Boston – Seattle-Tacoma are most frequently booked with Alaska Airlines.
Alaska Airlines
22 %
Spirit Airlines
22 %
Delta
19 %
Important flight information
Frequently Asked Questions (FAQ)
How long is the flight from Boston to Seattle-Tacoma?
A nonstop flight from Boston to Seattle-Tacoma typically takes around 6 hours 22 minutes. If you choose a connecting flight, allow more travel time. Typical one-stop itineraries take around 19 hours 42 minutes. For the quickest trip, a nonstop flight is usually the most comfortable choice.
Are there nonstop flights from Boston to Seattle-Tacoma?
Yes, there are nonstop flights from Boston to Seattle-Tacoma, averaging around 6 to 7 flights per day, operated by, among others, Alaska Airlines and Delta. If you want to fly without a layover, it is worth filtering specifically for nonstop flights when searching.
Which airlines fly from Boston to Seattle-Tacoma?
Direct flights from Boston to Seattle-Tacoma are operated by, among others, Alaska Airlines and Delta. Connecting flights with one stop are also available, for example with Alaska Airlines (via Portland-Oregon), United Airlines (via Denver) and Sun Country Airlines (via Minneapolis). If travel time matters to you, a direct flight is usually the most convenient option. Connecting flights often give you more choice of departure times and airlines.
On which days are there nonstop flights from Boston to Seattle-Tacoma?
Nonstop flights from Boston to Seattle-Tacoma operate daily. The schedule may vary by season, so it is worth comparing several travel dates. If your preferred day does not have a nonstop flight, nearby departure days or short connecting flights may be a good alternative.
How many flights are there per day from Boston to Seattle-Tacoma?
From Boston to Seattle-Tacoma, there are on average around 6 to 7 flights per day. This usually means you have a good choice of departure times. If you are flexible, you can easily compare times, prices, and airlines.
How many flights per week are there from Boston to Seattle-Tacoma?
From Boston to Seattle-Tacoma, there are around 46 to 47 flights per week. This means you usually have connections available on several days and at various times. Beyond the price, it is worth comparing flight duration, airline, and any potential additional fees.
When does the first flight from Boston to Seattle-Tacoma depart?
The earliest nonstop flight from Boston to Seattle-Tacoma usually departs at 7:00 AM. The exact departure time may vary by day of the week and airline. Early flights are especially useful if you want to make the most of your arrival day in Seattle-Tacoma.
When does the last flight from Boston to Seattle-Tacoma depart?
The last nonstop flight from Boston to Seattle-Tacoma usually departs at 6:37 PM. Late flights can be convenient if you want to travel after work or in the evening. Do check whether it is a nonstop flight, as a connecting itinerary could push the arrival time significantly later.