Route guide · 2,489 miles
Cheap Flights from Boston to Seattle
BOS → SEA · Nonstop 5h 34m · Live round-trip fares
Flying from Boston to Seattle doesn't have to drain your wallet. This 2,489-mile hop takes about 5h 34m nonstop, and fares swing a lot depending on the week you pick. Travelers who book roughly 4–8 weeks out usually come out ahead — set a free alert and let the deals come to you.
Live fares for BOS → SEA are updating. Use the search below for real-time prices.
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Flight time
5h 34m
Nonstop, typical
Distance
2,489 mi
BOS → SEA
Book ahead
4–8 weeks
Best window, typically
Nonstop airlines
3
American Airlines, Alaska Airlines & more
Nonstop flights from Boston to Seattle
Nonstop flights from Boston to Seattle are flown by American Airlines, Alaska Airlines, JetBlue. The 2,489-mile trip takes about 5h 34m gate to gate, and nonstops are usually cheapest when booked 4–8 weeks ahead.
Booking insights: Boston → Seattle
- Distance: 2,489 miles · nonstop flight time: 5h 34m.
- Fares tend to bottom out when you book about 4–8 weeks ahead — earlier than that rarely helps, later usually hurts.
- Tuesday and Wednesday departures usually undercut Friday and Sunday fares on routes like this one.
- A free fare alert beats daily checking: we watch this route and ping you when prices drop.
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Flying from Boston to Seattle: what you need to know
The flight
This is one of the long ones: 2,489 miles from BOS to SEA, about 5h 34m on a nonstop. Treat it like a short international flight — real meal plan, charged devices, a layer for the cabin — and the hours go much easier.
Airlines on this route
American Airlines, Alaska Airlines and JetBlue fly this route nonstop. That matters more than it sounds: the cheapest fare on one carrier is rarely the same product as the cheapest on another. Checked-bag fees, free seat selection and change rules all differ, so compare the full trip cost before you pick a winner. See our airline guides for exactly what each carrier charges — then send an enquiry and we'll confirm the all-in price for your dates.
Leaving from Boston (BOS)
Plan to be at the airport two hours before a domestic departure — ninety minutes can work at smaller airports outside peak times, but security lines are the one variable you can't control. If you're checking a bag, add time rather than cutting it close. Our Boston airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in Seattle (SEA)
Before you land, know how you're getting from the airport to where you're staying — it's the part of the trip people forget to plan. The Seattle airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check Seattle to Boston fares — prices on the return direction often move on a different rhythm.
When to book
For a trip of 2,489 miles, booking 4–8 weeks ahead typically lands you in the sweet spot. Leave it to the final two weeks and prices usually climb as the cheapest seats sell out. If your dates are flexible, midweek departures are where the lower fares hide on most domestic routes.
Good to know before you go
- Screenshot your fare before you enquire — prices move, and a saved fare helps our team match or beat it.
- Flexible dates? Search a few days either side — one day can change the fare a lot.
- Morning flights are delayed less often than evening ones — earlier departures have the best on-time record.
- Basic economy fares often exclude checked bags and seat selection. Price the whole trip, not the headline fare.
- Get to the airport two hours before departure; security, not the flight, is the part that runs late.
Boston to Seattle flight FAQs
How long is the flight from BOS to SEA?
Plan on about 5h 34m in the air for a nonstop from Boston to Seattle — the route runs roughly 2,489 miles. Connecting flights typically add 2–4 hours.
Are there nonstop flights from Boston to Seattle?
American Airlines, Alaska Airlines, JetBlue typically operate nonstop flights from BOS to SEA. Nonstops are usually cheapest when booked 4–8 weeks ahead of departure.
What is the cheapest month to fly from Boston to Seattle?
Fares from Boston to Seattle tend to ease outside the peak summer and holiday rush — the late-summer and early-fall shoulder weeks are usually kinder on the wallet. Set a free Airfare Deal alert and we'll flag the dips for your dates.
How much are last minute flights from BOS to SEA?
Book inside the final week and you'll usually pay a premium on BOS to SEA. Fares booked 4–8 weeks ahead are almost always kinder.
What is a good round-trip deal from Boston to Seattle?
A good deal is anything at or below the recent fares shown above. Set a free Airfare Deal alert and we'll ping you the moment fares drop.
Which airlines fly from Boston to Seattle?
You'll mainly see American Airlines, Alaska Airlines, JetBlue on Boston to Seattle. Checking each against the live fares below is the surest way to find the lowest price for your dates.
How early should I get to Boston airport for this flight?
Plan on two hours before departure for a domestic flight — ninety minutes can work at smaller airports outside peak times. If you're checking a bag, earlier is better; the bag-drop line, not the flight, is what runs late.
Do the cheapest fares on this route include a checked bag?
Usually not. Basic economy fares on most airlines include a carry-on but charge extra for checked bags, and seat selection can cost more too. Add up the real total before comparing — a slightly higher regular fare sometimes works out cheaper. Our team confirms the full breakdown with you before you pay.
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