Domestic route
Cheap flights from Seattle to Boston
Seattle-Tacoma International Airport (SEA) to Boston Logan International Airport (BOS). 2,489 miles, 5h 15m nonstop.
SEA to BOS 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 15mnonstop, gate to gate
- Nonstop airlines
- DLB6AS3 airlinesDelta, JetBlue, Alaska
- Nonstop flights per day
- 20all airlines combined
- Cheapest month
- February 2027over the next six months
- Best day to fly
- Tuesday19% less than Sunday
- Time difference
- 3h aheadBoston vs Seattle
Seattle to Boston
Round trips from $206
Per traveler, taxes and fees included. Lowest fare we found departs Wed, Feb 3.
Cheapest month: February 2027
See fares on these datesLock any fare free — pay only when you accept your last-minute deal
Or ask an agent on WhatsAppSeattle to Boston 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 Seattle to Boston
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 SEA to BOS 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.
- February 2027 is the cheapest month to fly over the next six months, with round trips from $206; September 2026 is the most expensive at $258 and up, a difference of $52 per traveler.
- Departing on a Tuesday averages 19% less than a Sunday 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.
- Boston is 3 hours ahead of Seattle. Expect to lose 3 hours on the clock heading east, so an overnight or late-afternoon departure tends to arrive at a more usable hour.
Destination guide
Boston: Revolutionary history in a walkable harbor city
Boston is compact, historic and easy: Logan Airport is minutes from downtown, the Freedom Trail links the sights, and fall in New England starts here. JetBlue and Delta hubs mean strong fare competition.
Best time to visit: Late September–October for foliage and crisp weather, May–June for spring. Summer is warm and busy; winter is cold but has the lowest prices.
Flying the other way? Boston to SeattleFares, airlines and tips for BOS to SEA.Ready to compare live fares?
See every airline on SEA–BOS side by side with bags and seat rules spelled out.
Search Seattle to BostonSeattle to Boston: common questions
How long is the flight from Seattle to Boston?
A nonstop flight from Seattle (SEA) to Boston (BOS) takes about 5h 15m 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 SEA to BOS?
Delta Air Lines, JetBlue and Alaska Airlines operate nonstop flights from Seattle (SEA) to Boston (BOS), 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 Seattle to Boston?
Over the next six months, February 2027 has the lowest round-trip fares from Seattle (SEA) to Boston (BOS), starting at $206 per traveler including taxes and fees. Within any month, Tuesday departures average the lowest prices.
How far in advance should I book Seattle to Boston 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 Seattle and Boston?
Boston is 3 hours ahead of Seattle. SEA is on America/Los Angeles time and BOS on America/New York 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.