Cheap Flights from Boston to Seattle | EazAir
Boston to Seattle flight insights
Average flight time
~5h 51m (estimated)
BOS → SEA
Cheapest month
—
Based on cached fare history
Cheapest cached price
$224
Checking live fares…
Prices shown may not be current. Last checked: Oct 4, 2026.
Planning a trip from Boston to Seattle? The average flight time on this route is ~5h 51m (estimated). The lowest fare we recorded on this route recently was $224 (last checked Oct 4, 2026); today's live fare for your dates can differ.
Boston to Seattle covers a straight-line distance of about 2,489 miles. Based on that distance, a nonstop flight would take approximately ~5h 51m (estimated). Actual flight time varies by airline, aircraft and routing.
Route Quick Facts
| Origin | Boston (BOS) |
|---|---|
| Destination | Seattle (SEA) |
| Average Flight Time | ~5h 51m (estimated) |
| Cheapest Month to Fly | — |
| Current Lowest Fare | $224 |
| Fares Last Checked | Oct 4, 2026 |
Flight deals from Boston to Seattle
Direct flights departing from Boston Logan International Airport (BOS) cover the 2,496-mile journey to Seattle-Tacoma International Airport (SEA) in approximately six hours and fifteen minutes. Passengers traveling from Massachusetts to Washington State will cross three time zones during this cross-country trip. Connecting routes through hubs like Chicago O'Hare or Denver International Airport typically add two to four hours to the total transit time between Boston and Seattle. Several major carriers operate regular service on the Boston to Seattle route, giving New England travelers multiple booking options. Alaska Airlines and Delta Air Lines dominate the direct flight market between BOS and SEA, operating daily nonstop schedules. Fliers willing to book layovers from Boston to Seattle often find competitive fares on United Airlines, American Airlines, and JetBlue. Summer represents the peak travel season for the Boston to Seattle air corridor, with July and August seeing the highest passenger volumes due to cruise departures from the Pacific Northwest. Travelers planning a trip from Boston to Seattle during these busy months should secure their tickets at least six weeks prior to departure to avoid premium pricing. September and October offer lower fares and fewer crowds on flights from Boston to Seattle, making early autumn an ideal time for budget-conscious fliers to cross the country.
About Seattle
Popular areas to know in Seattle include Capitol Hill, Ballard, and Fremont.
Mild, wet winters and dry, mild summers — the Pacific Northwest's rainy reputation is strongest from October through April.
Frequently asked questions
How long is the flight from Boston to Seattle?
Which airlines offer direct flights from Boston to Seattle?
What is the cheapest month to fly from Boston to Seattle?
Are there morning flights available from Boston to Seattle?
How far in advance should I book my Boston to Seattle flight?
What airports will I use when flying from Boston to Seattle?
Can I bring a carry-on bag on my Boston to Seattle flight?
What are the most common layover cities for connecting flights from Boston to Seattle?
Do flights from Boston to Seattle offer Wi-Fi?
What time zone changes occur when traveling from Boston to Seattle?
How far is it from Boston to Seattle?
What ID do I need to fly from Boston to Seattle?
Which airlines operate flights from Boston to Seattle?
What's the weather usually like in Seattle?
Airline bag fees
Baggage allowances differ significantly between fare classes (Basic/Light vs. Standard/Flex) and can change over time. Always verify the exact allowance for your specific fare with the airline before you fly.
Travel tips
Arrive early for domestic flights
TSA generally recommends arriving at least 2 hours before a domestic departure, more at larger hub airports during peak travel periods.
Pack a mixed carry-on
Keep a change of clothes, chargers, and any essentials in your carry-on rather than only your checked bag, in case of a delay or a bag that doesn't arrive with you.
Ease jet lag on longer routes
On longer cross-country flights, adjusting your sleep schedule a day or two before departure and staying hydrated in flight can reduce jet lag on arrival.
Screenshot your confirmation
Save a screenshot or PDF of your booking confirmation and boarding pass before you travel, in case you lose signal or battery at the airport.
Check in online when it opens
Most airlines open online check-in 24 hours before departure — checking in early can help with seat selection and, on some airlines, boarding group assignment.
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