Flights from Seattle to Boston
North AmericaYear-round

Cheap Flights from Seattle to Boston

Track economy fares on the SEABOS route and get alerts when prices drop.

From
Seattle
SEA
To
Boston
BOS

Route Intelligence: SeattleBoston

Flight Duration

5 hr 30 min (Direct)

Price Guidance

A good deal is under $250 roundtrip. Standard fare is $400+.

Peak Season

June to August

Top Airlines

Alaska Airlines, JetBlue, Delta Air Lines

Booking Tip

Book 4-6 weeks in advance for the best fares on this domestic route. Traveling Tuesday or Wednesday can save 10-20% compared to weekend departures.

Track SeattleBoston Fares

Set your target price and FlightKitten will scan this route twice daily. The instant economy fares drop below your budget, you'll get an email with the price, airline, and a direct booking link.

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Flying Business Class?

If you're considering business class on this route, BusinessClassSignal.com is a dedicated tool that tracks premium cabin fares. They alert you when business & first class prices drop — worth checking out if you fly up front.

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Other Routes to Boston

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Route Briefing: Seattle to Boston

Five and a half hours nonstop from Seattle puts you down in one of America's most historically rich and walkable cities — and that combination alone makes this route worth booking. Alaska Airlines, JetBlue, and Delta all serve this corridor year-round, so competition keeps fares reasonably honest. Lock in a roundtrip under $250 and you've genuinely scored; anything approaching $400 or above means you waited too long or picked the wrong travel days.

Speaking of which: flying Tuesday or Wednesday instead of Friday or Sunday can shave 10 to 20 percent off your fare on this route. Book four to six weeks out for the sweet spot between availability and price. Summer — June through August — is peak season, when the city hums with tourists, students, and outdoor festivals. But don't overlook fall, when Boston arguably looks its best. The foliage across the Common and along the Charles River is genuinely spectacular, crowds thin out after Labor Day, and the crisp New England air makes all that walking feel effortless.

And you will walk. Boston is built for it in a way that few American cities are. The Freedom Trail is a literal red line painted through the city connecting sixteen historic sites — from the Massachusetts State House to the USS Constitution in Charlestown — and you can follow it at your own pace without a guide or a tour bus. The neighborhoods reward wandering too: Beacon Hill's gas-lit cobblestone streets, the North End's dense Italian-American character, and the waterfront's working harbor all feel distinct and genuinely alive.

The food scene is anchored in seafood, and rightfully so. Clam chowder, lobster rolls, and fresh oysters are everywhere, and the quality is consistently high because the supply chain is short. The North End is also worth visiting just for the pastry shops and espresso culture that have been there for generations.

From Logan International Airport, getting into the city is straightforward and cheap. The MBTA Silver Line bus runs directly from the terminals to South Station with no fare, connecting you to the rest of the subway system. It's one of the best free airport transit connections in the country and takes roughly 20 to 30 minutes depending on your destination.

If you're a Pacific Northwesterner used to Seattle's outdoor-meets-urban personality, Boston will feel both familiar and fascinatingly different — same intellectual energy, completely different history. This is a route worth taking at least once, and at the right price, probably more than that.

How much are flights from Seattle to Boston in 2026?

Flight prices from Seattle (SEA) to Boston (BOS) vary significantly depending on the season, day of the week, and how far in advance you book. A good deal is under $250 roundtrip. Standard fare is $400+. Popular carriers on this route include Alaska Airlines, JetBlue, Delta Air Lines. FlightKitten eliminates the guesswork by monitoring 220+ airlines twice daily and alerting you the moment economy fares hit your target price.

How does FlightKitten track Seattle to Boston fares?

FlightKitten scans over 220 airlines twice every day for economy fares on the SEA to BOS route. When you set a target price, FlightKitten continuously monitors this route and sends an email alert the moment fares drop below your budget. Each alert includes the exact fare, airline, dates, and an AI-powered briefing that explains whether the deal is genuinely good compared to historical pricing on this route. No more obsessive price checking — set your budget and let FlightKitten do the watching.

Pro tip: Book 4-6 weeks in advance for the best fares on this domestic route. Traveling Tuesday or Wednesday can save 10-20% compared to weekend departures.

Looking for business class deals on this route? We recommend checking out BusinessClassSignal.com — a dedicated premium cabin fare tracker that's worth a look if you fly up front.