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Cheap Flights from Boston to Seattle | EazAir

Travellers

Boston to Seattle flight insights

Average flight time

~5h 51m (estimated)

BOS → SEA

Cheapest month

—

Based on cached fare history

Cheapest cached price

$214

Checking live fares…

Last checked Sep 23, 2026

Planning a trip from Boston to Seattle? The average flight time on this route is ~5h 51m (estimated). The lowest fare we have cached for this route is $214 (last checked Sep 23, 2026).

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

Quick facts for flights from Boston to Seattle on Eazair
OriginBoston (BOS)
DestinationSeattle (SEA)
Average Flight Time—
Cheapest Month to Fly—
Current Lowest Fare$214
Fares Last CheckedSep 23, 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.

View of Seattle, a popular flight destination from Boston

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?
A nonstop flight from Boston Logan International Airport (BOS) to Seattle-Tacoma International Airport (SEA) takes roughly six hours and fifteen minutes.
Which airlines offer direct flights from Boston to Seattle?
Alaska Airlines and Delta Air Lines currently provide daily nonstop flights from Boston to Seattle.
What is the cheapest month to fly from Boston to Seattle?
January and February typically offer the lowest airfares for flights from Boston to Seattle, as post-holiday winter travel demand drops significantly.
Are there morning flights available from Boston to Seattle?
Yes, both Alaska Airlines and Delta Air Lines schedule early morning departures from Boston, allowing passengers to arrive in Seattle before noon local time.
How far in advance should I book my Boston to Seattle flight?
To secure the best rates, travelers should book their Boston to Seattle tickets at least four to six weeks before their intended departure date.
What airports will I use when flying from Boston to Seattle?
You will depart from Boston Logan International Airport (BOS) and arrive at Seattle-Tacoma International Airport (SEA).
Can I bring a carry-on bag on my Boston to Seattle flight?
Major carriers flying from Boston to Seattle, including Delta, Alaska, and United, include one standard carry-on bag and one personal item in standard economy fares, though basic economy rules vary by airline.
What are the most common layover cities for connecting flights from Boston to Seattle?
Travelers booking connecting itineraries from Boston to Seattle frequently stop in Chicago (ORD), Minneapolis (MSP), or Denver (DEN).
Do flights from Boston to Seattle offer Wi-Fi?
Most major carriers servicing the Boston to Seattle route provide inflight Wi-Fi for purchase, and some airlines like Delta offer free messaging for SkyMiles members.
What time zone changes occur when traveling from Boston to Seattle?
Seattle operates on Pacific Time, which is three hours behind Boston's Eastern Time, meaning you will gain three hours on your clock when flying west.
How far is it from Boston to Seattle?
The straight-line distance from Boston to Seattle is about 2,489 miles.
What ID do I need to fly from Boston to Seattle?
Since Boston to Seattle is a domestic US flight, you'll need a REAL ID-compliant driver's license or another TSA-accepted form of ID, such as a valid US passport. A standard, non-compliant driver's license alone is no longer accepted at TSA checkpoints.
Which airlines operate flights from Boston to Seattle?
Based on a recent live fare search, Southwest Airlines, Delta Air Lines, American Airlines and United Airlines had bookable flights on the Boston to Seattle route.
What's the weather usually like in Seattle?
Mild, wet winters and dry, mild summers — the Pacific Northwest's rainy reputation is strongest from October through April.

Airline baggage policies

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.

General airline baggage policy reference
AirlineCabin bagChecked bag
Delta Air Lines1 carry-on + 1 personal item on most fares1 checked bag typically included on Main Cabin and above; Basic Economy usually excludes it
American Airlines1 carry-on + 1 personal item on most fares1 checked bag typically included on Main Cabin and above; Basic Economy usually excludes it
United Airlines1 carry-on + 1 personal item on most fares1 checked bag typically included on Economy and above; Basic Economy usually excludes it
Southwest Airlines1 carry-on + 1 personal item2 checked bags included on every fare — a long-standing, well-known Southwest policy
JetBlue Airways1 personal item on the cheapest (Blue Basic) fare; a carry-on is added on higher faresNot included on Blue Basic; typically included from Blue Plus and above
Alaska Airlines1 carry-on + 1 personal item on most fares1 checked bag typically included on Main and above; Saver fares usually exclude it
Spirit Airlines1 personal item included; a full-sized carry-on is a paid add-onNot included on the base fare — a paid add-on at every fare tier
Frontier Airlines1 personal item included; a full-sized carry-on is a paid add-onNot included on the base fare — a paid add-on at every fare tier

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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