Flight route guide
Flights from BOS to SEA
From $129 rt
BOS–SEA is a coast-to-coast market. Daytime nonstops, evening departures, and redeyes trade schedule comfort against price—review arrival time at Seattle as carefully as the fare. Recent searches found fares from $129 rt. Typical domestic flight time is 2h – 5h nonstop on most US routes.
Sample fares found recently — search above for live prices on your dates.
Search live BOS → SEA faresTypical flight time
2h – 5h nonstop on most US routes
Best time to book
4–8 weeks before departure
Often cheapest days
Tuesday–Thursday; midweek redeyes often price softer
Best months to fly
January–February and September–October are often cheaper for US domestic travel outside major holidays.
Flying from Boston (BOS) to Seattle (SEA)
BOS–SEA is a coast-to-coast market. Daytime nonstops, evening departures, and redeyes trade schedule comfort against price—review arrival time at Seattle as carefully as the fare.
Leaving Boston
Departing BOS: Silver Line to downtown is useful after landing. For outbound Europe flights, morning departures often reduce cascade risk.
Arriving in Seattle
Seattle-Tacoma (SEA) is a growing long-haul and Alaska Airlines hub with light-rail into downtown. Popular West Coast gateway toward Asia and Hawaii.
Thanksgiving, Christmas/New Year, and summer Fridays are the priciest coast-to-coast periods.
Alternative airports
If Boston (BOS) or Seattle (SEA) has multiple airports in the metro, check nearby options in your search for better fares.
Airlines on BOS–SEA
- American Airlines
- Delta Air Lines
- United Airlines
- Southwest Airlines
- JetBlue Airways
Tips for cheaper Boston to Seattle flights
- •For BOS–SEA, aim to book about 4–8 weeks before departure when you can—earlier for holidays.
- •January–February and September–October are often cheaper for US domestic travel outside major holidays.
- •Compare daytime nonstops with redeyes: a lower fare is less useful if you lose a workday on arrival.
- •If Boston (BOS) or Seattle (SEA) has multiple airports in the metro, check nearby options in your search for better fares.
- •U.S. domestic bag rules vary by fare family—confirm carry-on and checked-bag terms at checkout.
Frequently asked questions
How long is the flight from Boston to Seattle?
Most itineraries from BOS to SEA take 2h – 5h nonstop on most US routes. Exact duration depends on nonstop vs connecting flights and winds.
When is usually a better time to fly BOS–SEA?
Thanksgiving, Christmas/New Year, and summer Fridays are the priciest coast-to-coast periods. Use flexible midweek dates when you can, and search more than one week if your plans allow.
Which airlines may appear from Boston to Seattle?
Schedules change, but this market often shows carriers such as American Airlines, Delta Air Lines, United Airlines, Southwest Airlines. Confirm the operating airline and any codeshare in live results.
Are nonstops common on BOS–SEA?
Nonstop availability depends on the season and airline. Compare total travel time, not only the number of stops, in live results.
What sample fares has Flitura seen on BOS–SEA?
Recent searches found round-trip samples from $129 on this route. Live prices change—search with your dates for the current total.
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How this page is built
This flight route page is written for travelers planning a real trip—not to rank for every keyword variation. Route and destination pages combine Flitura flight-search tools with editorial airport, airline, and booking guidance. Sample schedules and “from” prices, when shown, come from live or recently observed search data and can change. Always confirm the final fare, baggage rules, and travel documents at checkout.