BOS to SEA Flights: Traverse the Continental US from Boston to Seattle
Cheapest flight found
$174
Last updated Mar 13, 2026
Prices by Month
Price History
Tracking the May 7, 2026 departure — the cheapest date we found.
Price Behavior: BOS → SEA
Based on 6 months of fare data collected by Trip Manta.
Lowest Fare
$174
Highest Fare
$254
Median Fare
$234
Price Spread
$80
Prices fluctuate moderately — tracking can help you catch dips.
Cheapest month to fly: May 2026 (from $174)
Most expensive month: April 2026 (from $254)
Biggest price drop caught: $70 between consecutive checks
Most frequent cheapest airline: Southwest
What This Means for You
Flights from Boston to Seattle range from $174 to $254, a $80 spread across the months we track. If your dates are flexible, May 2026 tends to have the lowest fares. Prices move enough that tracking can save you money — drops often last only a few hours before the algorithm adjusts back up. We have caught drops as large as $70 between hourly checks on this route.
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From
Boston (BOS)
To
Seattle (SEA)
Airport Information
Boston (BOS)
Boston Logan International Airport (BOS) serves as the primary gateway for New England, offering a sophisticated array of four terminals connected by a convenient shuttle system and the Silver Line bus service. Known for its proximity to downtown Boston, Logan provides travelers with premium lounges, diverse dining options featuring local seafood like New England clam chowder, and efficient security checkpoints. It is a major hub for Delta and JetBlue, ensuring frequent daily departures to the West Coast.
Seattle (SEA)
Seattle-Tacoma International Airport (SEA), commonly referred to as Sea-Tac, is the largest airport in the Pacific Northwest and a primary hub for Alaska Airlines and Delta Air Lines. Located about 14 miles south of downtown Seattle, the airport features an impressive central terminal with a massive glass wall overlooking the runways and the Olympic Mountains. Travelers can easily reach the city center via the Link Light Rail, which offers a cost-effective and scenic transit option directly from the airport parking garage.
Frequently Asked Questions
How long is the flight from Boston to Seattle?
A non-stop flight typically takes between 6 hours and 15 minutes to 6 hours and 45 minutes, covering approximately 2,500 miles across the country.
Which airlines offer direct flights from BOS to SEA?
Major carriers providing non-stop service include Alaska Airlines, Delta Air Lines, and JetBlue, offering several daily frequencies to accommodate different schedules.
What is the best way to get from SEA airport to downtown Seattle?
The Sound Transit Link Light Rail is highly recommended for its efficiency and low cost, though rideshare services, taxis, and airport shuttles are also readily available.
Is there a significant time difference between Boston and Seattle?
Yes, Seattle is in the Pacific Time Zone, which is three hours behind Boston's Eastern Time Zone, so you will 'gain' three hours when flying west.
Are there premium lounges available at BOS for this route?
Yes, Boston Logan offers several premium lounges across all terminals, including the Chase Sapphire Lounge, United Club, and Delta Sky Club, which are accessible to eligible passengers before their long-haul flight.
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