Direct (non-stop) flights from Boston (BOS) to SeaTac (SEA)
Find comprehensive flight information, schedules, and booking details for direct flights from Boston (BOS) to SeaTac (SEA). This popular route is operated by 2 airlines, offering multiple daily departures.• Flight Duration: 6h 08m - 6h 40m (average flight time)• Distance: 2502 miles (4026 km) (air miles between airports)• Daily Flights: 4-6 flights (scheduled departures per day)
Boston (BOS)
SeaTac (SEA)
FLIGHT TIME
6h 08m - 6h 40m
FLIGHT DISTANCE
2502 miles (4026 km)
6h 24m - 6h 31m
07:11
19:00
2502 miles (4026 km)
March
2 (Show)
51
Flight Schedule
December 2025
Airlines with direct flights from Boston (BOS) to SeaTac (SEA)
Route Insights
Duration variability: Flight duration on this route can vary based on aircraft type, wind conditions, and airline scheduling. Average duration is 6h 08m - 6h 40m.
Pricing patterns: March typically offers lower prices due to reduced demand outside peak travel seasons.
Airline service: This route is primarily served by Alaska Airlines and Delta Air Lines, reflecting hub connections and route network strategies.
Best departure times: Peak departure times are 7:00, 9:00, 11:00, offering more flight options and potentially better connections.
Boston (BOS) - SeaTac (SEA) flight price statistics
$370
ApproximateThe numbers are average prices found based on user searches for direct flights between the airports. It's calculated from the cheapest prices found per month for a round-trip with 1 adult and can vary depending on the amount of data we have for this particular route.
$214
Jan$227
Feb$197
Mar$243
Apr$563
May$538
Jun$648
Jul$738
Aug$298
Sep$268
Oct$268
Nov$238
DecRelated Information
Airports: BOS • SEA Airport
Airlines operating this route: Alaska Airlines (AS), Delta Air Lines
Frequently Asked Questions
How many flights operate from BOS to SEA?
There are 6 direct flights operating from BOS to SEA. Approximately 4-6 flights daily.
Which airlines operate flights from BOS to SEA?
2 airlines operate on this route: Alaska Airlines, Delta Air Lines.
How long is the flight from BOS to SEA?
The flight duration from BOS to SEA is approximately 6h 08m - 6h 40m.
What is the distance from BOS to SEA?
The distance from BOS to SEA is 2502 miles (4026 km).
What is the flight time range for this route?
Flight times on this route range from 6h 24m - 6h 31m.
What are the earliest and latest flight departure times?
The earliest flight departs at 07:11 and the latest flight departs at 19:00.
What is the cheapest month to fly from BOS to SEA?
March is typically the cheapest month to fly on this route.
How many flights operate per week on this route?
Approximately 51 flights operate per week from BOS to SEA.
What types of aircraft operate on this route?
This route is served by Boeing 737-900 (winglets) Passenger/BBJ3, Airbus A321neo, Boeing 737MAX 9 Passenger.
What is the average flight price from BOS to SEA?
The average flight price for a round-trip ticket from BOS to SEA is approximately $370 USD. Prices can vary based on booking time, season, and airline.
When is the best time to book flights from BOS to SEA for the lowest prices?
March is typically the cheapest month to fly from BOS to SEA. Booking in advance and avoiding peak travel seasons can help you find better deals.
How many airlines offer flights from BOS to SEA?
2 airlines offer direct flights from BOS to SEA, providing travelers with multiple options for scheduling and pricing.
How far is SEA from BOS?
The distance from BOS to SEA is 2502 miles (4026 km). This is a long-haul flight route.
How long does it take to fly from BOS to SEA?
The flight time from BOS to SEA is approximately 6h 08m - 6h 40m. Actual flight duration may vary based on weather conditions, aircraft type, and routing.