Domestic route
Cheap flights from Boston to Seattle
Boston Logan International Airport (BOS) to Seattle-Tacoma International Airport (SEA). 2,489 miles, 5h 50m nonstop.
BOS to SEA at a glance
Computed from airline schedules and the fares we track for this route. Refreshed several times a day.
- Distance
- 2,489 milesgreat-circle
- Typical flight time
- 5h 50mnonstop, gate to gate
- Nonstop airlines
- DLB6AS3 airlinesDelta, JetBlue, Alaska
- Nonstop flights per day
- 20all airlines combined
- Cheapest month
- January 2027over the next six months
- Best day to fly
- Tuesday19% less than Friday
- Time difference
- 3h behindSeattle vs Boston
Boston to Seattle
Round trips from $204
Per traveler, taxes and fees included. Lowest fare we found departs Tue, Jan 5.
Cheapest month: January 2027
See fares on these datesLock any fare free — pay only when you accept your last-minute deal
Or ask an agent on WhatsAppBoston to Seattle fares by month
Lowest round-trip economy fare per traveler in each of the next six months, taxes and fees included. Select a month to search that date.
Airlines flying Boston to Seattle
3 airlines fly nonstop with 20 departures a day combined, plus 7 more with one stop.
- DLDelta Air LinesSkyTeamNonstop · 10 flights a day · first checked bag from $35
- ASAlaska AirlinesoneworldNonstop · 5 flights a day · first checked bag from $35
- B6JetBlueNonstop · 5 flights a day · first checked bag from $40
- AAAmerican AirlinesoneworldConnecting via DFW, CLT, ORD, MIA, PHX, PHL, LAX, DCA, JFK · first checked bag from $40
- MXBreeze AirwaysLow-costConnecting via CHS, TPA, RDU, ORF · first checked bag from $45
- F9Frontier AirlinesLow-costConnecting via DEN, LAS, MCO, PHL, ATL, PHX, CLE · first checked bag from $55
- WNSouthwest AirlinesLow-costConnecting via DAL, HOU, MDW, BWI, DEN, LAS, PHX, OAK, MCO, ATL, BNA, LAX, SAN, STL, AUS · first checked bag from $35
- NKSpirit AirlinesLow-costConnecting via FLL, LAS, DTW, MCO, DFW, ATL, IAH · first checked bag from $55
- SYSun Country AirlinesLow-costConnecting via MSP · first checked bag from $45
- UAUnited AirlinesStar AllianceConnecting via ORD, DEN, IAH, EWR, SFO, IAD, LAX · first checked bag from $40
Connecting options
Hubs where one airline can carry you on both legs, most choices first.
- Phoenix (PHX)AAWNF93 airlines
- Los Angeles (LAX)AAUAWN3 airlines
- Denver (DEN)UAWNF93 airlines
- Las Vegas (LAS)WNNKF93 airlines
- Orlando (MCO)WNNKF93 airlines
Tips for this route
- Delta, JetBlue and Alaska all fly BOS to SEA nonstop, so compare the total with bags before picking the lowest base fare: the difference between a basic and a standard economy ticket is often less than one checked bag each way.
- January 2027 is the cheapest month to fly over the next six months, with round trips from $204; September 2026 is the most expensive at $282 and up, a difference of $78 per traveler.
- Departing on a Tuesday averages 19% less than a Friday on this route. If your dates are flexible, shift the outbound by a day or two and check the calendar view before you book.
- Fares on this route are usually lowest 4 to 8 weeks before departure and rise sharply inside two weeks.
- Seattle is 3 hours behind Boston. A morning departure lands in Seattle with most of the day left; an evening flight arrives close to local dinner time.
Destination guide
Seattle: Coffee, mountains and Puget Sound
Seattle is the Pacific Northwest's gateway: Pike Place Market, the Space Needle and ferries across Puget Sound, with Mount Rainier and the Olympic Peninsula a couple of hours away. Sea-Tac is a Delta and Alaska hub with light rail downtown.
Best time to visit: July–September is dry, sunny and gorgeous — and the most expensive. May–June and late September are good compromises. October–April is gray and drizzly but cheap.
Flying the other way? Seattle to BostonFares, airlines and tips for SEA to BOS.Ready to compare live fares?
See every airline on BOS–SEA side by side with bags and seat rules spelled out.
Search Boston to SeattleBoston to Seattle: common questions
How long is the flight from Boston to Seattle?
A nonstop flight from Boston (BOS) to Seattle (SEA) takes about 5h 50m gate to gate, covering 2,489 miles. Connecting itineraries add the layover, typically 1 to 3 hours more in total.
Which airlines fly nonstop from BOS to SEA?
Delta Air Lines, JetBlue and Alaska Airlines operate nonstop flights from Boston (BOS) to Seattle (SEA), with 20 nonstop departures a day between them. One-stop options connect through PHX, LAX and DEN.
What is the cheapest month to fly from Boston to Seattle?
Over the next six months, January 2027 has the lowest round-trip fares from Boston (BOS) to Seattle (SEA), starting at $204 per traveler including taxes and fees. Within any month, Tuesday departures average the lowest prices.
How far in advance should I book Boston to Seattle flights?
Fares on this route are usually lowest 4 to 8 weeks before departure and rise sharply inside two weeks. Air1 Tickets includes free cancellation within 24 hours of booking on every fare, so you can lock in a good price and keep looking.
What is the time difference between Boston and Seattle?
Seattle is 3 hours behind Boston. BOS is on America/New York time and SEA on America/Los Angeles time. Departure and arrival times in search results are always shown in local time at each airport.
Related routes
Other popular city pairs from the same departure city and to the same destination, with the lowest round-trip fares we found.