Boston (BOS) to Seattle (SEA) is about 2,490 miles and typically takes 5 h 30 min by air. Some carriers have hubs at both ends, which makes frequent nonstops more likely. Call (800) 490-3234 for live fares.
BOS to SEA at a glance
| Route | Boston (BOS) to Seattle (SEA) |
|---|---|
| Distance | about 2,490 miles / 4,000 km |
| Typical flight time | 5 h 30 min (estimate) |
| Time difference | 3 hours behind |
| Route type | Domestic (U.S.) |
| Airlines with hubs here | Delta Air Lines, JetBlue Airways, and Alaska Airlines |
About the Boston to Seattle route
Boston to Seattle is a cross-country style flight of about 2,490 miles, long enough that cabin choice, seat selection and time-zone planning all matter. It is a route many travelers book well in advance.
Flight time and distance
A typical flight takes about 5 h 30 min gate to gate, with a realistic range of 5 h 15 min to 6 h depending on wind, routing and aircraft. That is an estimate based on the distance of roughly 2,490 miles (4,000 km), not a published schedule. Flights heading west usually take noticeably longer than flights heading east because of prevailing winds aloft, so the return flight can differ by 30 minutes or more.
Seattle is 3 hours behind Boston on standard time, so the arrival time on your ticket will look different from the flight duration.
Among the 200 routes in our guides, BOS to SEA is longer than about 78% of them.
For comparison, Boston to Las Vegas (BOS to LAS) is about 2,380 miles, so Seattle is a bit farther out from BOS.
The airports
Boston Logan International Airport (BOS)
Logan is only a few minutes by water or road from downtown Boston. Full BOS guide.
Seattle-Tacoma International Airport (SEA)
Sea-Tac is Alaska Airlines' home hub and a growing Delta gateway to Asia, which makes it a useful connecting point for Alaska, Hawaii and Pacific routes. Full SEA guide.
Other airports are worth a look: around Boston, Providence; and around Seattle, Portland (PDX). Comparing them can change the price or the travel time to your final destination.
Airlines on this route
Delta Air Lines has a hub at both ends, so it is the most likely to offer frequent nonstop service and easy rebooking on this route.
JetBlue Airways and Alaska Airlines also have a major presence at one of the two airports.
Airlines add and drop frequencies throughout the year. Our agents can check what is actually scheduled on your dates.
Common connection points
A one-stop trip would most naturally connect through a hub such as Delta Air Lines via Minneapolis (MSP), which adds about 30 miles (1% beyond the direct distance) or JetBlue Airways via New York (JFK), which adds about 110 miles (5% beyond the direct distance). Choose the connection with the best weather odds for your travel month and leave a comfortable layover; our layover guide explains how much time is realistic.
Best time to fly
Seasonal factors to weigh: at SEA, july through September has the clearest weather and the heaviest demand, including cruise-season traffic to Alaska. At BOS, winter nor'easters and summer fog are the main causes of delays.
Ground transport
Getting to and from BOS
The MBTA Blue Line and Silver Line buses connect Logan to downtown, and a water shuttle links the terminals to the Seaport.
Getting to and from SEA
Link light rail runs from the terminal to downtown Seattle in roughly 40 minutes without road traffic.
Booking tips
Fares on routes with strong business demand rarely drop sharply at the last minute. Book once your dates are firm and review the 24-hour rule in case plans change.
Frequently asked questions
How long is the flight from Boston to Seattle?
A typical BOS to SEA flight takes about 5 h 30 min, with a likely range of 5 h 15 min to 6 h. Actual time depends on wind, routing, aircraft and whether you connect.
How far is Seattle from Boston by air?
The great-circle distance between BOS and SEA is about 2,490 miles (4,000 km).
Which airlines fly from Boston to Seattle?
Delta Air Lines, JetBlue Airways, and Alaska Airlines have a major presence at BOS or SEA, and service varies by season. Ask us to check current nonstop and connecting options.
What is the time difference between Boston and Seattle?
Seattle is 3 hours behind Boston on standard time. Daylight saving time can change the gap for part of the year.
Are there other airports near Boston?
Yes. Nearby alternatives include Providence. Comparing them can change both fare and travel time.
When is the best time to book BOS to SEA?
Domestic fares are often competitive one to three months ahead, while international trips benefit from more lead time. Compare several dates, since fares are priced flight by flight.
Explore related routes
More flights involving Boston (BOS)
- Atlanta to BostonATL to BOS
- Boston to CharlotteBOS to CLT
- Boston to DetroitBOS to DTW
- Boston to Las VegasBOS to LAS
- Boston to LondonBOS to LHR
- Boston to Los AngelesBOS to LAX
More flights involving Seattle (SEA)
- Atlanta to SeattleATL to SEA
- Austin to SeattleAUS to SEA
- Detroit to SeattleDTW to SEA
- Dubai to SeattleDXB to SEA
- Houston to SeattleIAH to SEA
- London to SeattleLHR to SEA
Last reviewed October 22, 2026. FlighTicketHub provides general information; confirm details with the airline before you travel.