Direct (non-stop) flights from SeaTac (SEA) to Boston (BOS)
Find comprehensive flight information, schedules, and booking details for direct flights from SeaTac (SEA) to Boston (BOS). This popular route is operated by 2 airlines, offering multiple daily departures.• Flight Duration: 5h 14m - 6h 35m (average flight time)• Distance: 2502 miles (4026 km) (air miles between airports)• Daily Flights: 3-7 flights (scheduled departures per day)
SeaTac (SEA)
Boston (BOS)
FLIGHT TIME
5h 14m - 6h 35m
FLIGHT DISTANCE
2502 miles (4026 km)
5h 15m - 5h 30m
07:30
23:12
2502 miles (4026 km)
March
2 (Show)
42
Flight Schedule
December 2025
Airlines with direct flights from SeaTac (SEA) to Boston (BOS)
Route Insights
Duration variability: Flight duration on this route can vary based on aircraft type, wind conditions, and airline scheduling. Average duration is 5h 14m - 6h 35m.
Pricing patterns: March typically offers lower prices due to reduced demand outside peak travel seasons.
Airline service: This route is primarily served by Delta Air Lines and Alaska Airlines, reflecting hub connections and route network strategies.
Best departure times: Peak departure times are 15:00, 7:00, 8:00, offering more flight options and potentially better connections.
SeaTac (SEA) - Boston (BOS) flight price statistics
$359
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$228
Feb$198
Mar$238
Apr$238
May$525
Jun$578
Jul$766
Aug$348
Sep$218
Oct$268
Nov$488
DecRelated Information
Airports: SEA • BOS Airport
Airlines operating this route: Delta Air Lines (DL), Alaska Airlines
Frequently Asked Questions
How many flights operate from SEA to BOS?
There are 6 direct flights operating from SEA to BOS. Approximately 3-7 flights daily.
Which airlines operate flights from SEA to BOS?
2 airlines operate on this route: Delta Air Lines, Alaska Airlines.
How long is the flight from SEA to BOS?
The flight duration from SEA to BOS is approximately 5h 14m - 6h 35m.
What is the distance from SEA to BOS?
The distance from SEA to BOS is 2502 miles (4026 km).
What is the flight time range for this route?
Flight times on this route range from 5h 15m - 5h 30m.
What are the earliest and latest flight departure times?
The earliest flight departs at 07:30 and the latest flight departs at 23:12.
What is the cheapest month to fly from SEA to BOS?
March is typically the cheapest month to fly on this route.
How many flights operate per week on this route?
Approximately 42 flights operate per week from SEA to BOS.
What types of aircraft operate on this route?
This route is served by Airbus A321neo, Boeing 737MAX 9 Passenger, Boeing 737-900 (winglets) Passenger/BBJ3.
What is the average flight price from SEA to BOS?
The average flight price for a round-trip ticket from SEA to BOS is approximately $359 USD. Prices can vary based on booking time, season, and airline.
When is the best time to book flights from SEA to BOS for the lowest prices?
March is typically the cheapest month to fly from SEA to BOS. Booking in advance and avoiding peak travel seasons can help you find better deals.
How many airlines offer flights from SEA to BOS?
2 airlines offer direct flights from SEA to BOS, providing travelers with multiple options for scheduling and pricing.
How far is BOS from SEA?
The distance from SEA to BOS is 2502 miles (4026 km). This is a long-haul flight route.
How long does it take to fly from SEA to BOS?
The flight time from SEA to BOS is approximately 5h 14m - 6h 35m. Actual flight duration may vary based on weather conditions, aircraft type, and routing.