Flights operate between Seattle (SEA) and Boston (BOS).
2 airlines operate this route with 3-7 flights daily flights.
Average flight time is 5h 14m - 6h 35m.
Route distance is 2502 miles (4026 km).
Route Distance
2502 miles (4026 km)
Average Duration
5h 14m - 6h 35m
Airlines Operating This Route
Delta Air Lines, Alaska Airlines
Flight Frequency
Daily Flights
3-7 flights
Weekly Flights
42
Typical Departure Time Ranges
Earliest Departure
07:30
Latest Departure
23:12
Flight Schedule & Filters
Flight Schedule Calendar
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Direct (non-stop) flights from SeaTac (SEA) to Boston (BOS)
Direct (non-stop) flights operate between SeaTac (SEA) and 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)
US
Boston (BOS)
US
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
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Airlines with direct flights from SeaTac (SEA) to Boston (BOS)
Weather at Boston (BOS)
Weather & Climate at Boston (BOS)
11.4°C
Avg Temperature115mm
Avg Rainfall13.9km/h
Avg Wind Speed74%
Avg HumidityBest Months to Visit
Challenging Months
12-Month Weather Overview
Wind Speed by Month
Humidity by Month
Booking Insights
Best Time to Book Flights to Boston (BOS)
Best Booking Window
Book 2-3 months in advance for best prices
Booking Tip
Avoid booking during extreme weather months for better deals
Peak Travel Months
Expect higher prices and more crowds during these months. Book early to secure better rates.
Recommended Months
These months offer the best balance of weather, prices, and availability.
Monthly Booking Recommendations
Price Trends
Flight Price Trends for Boston (BOS)
Cheapest Months to Fly
Book flights during these months for the best deals and lowest prices.
Most Expensive Months
Prices are typically highest during these months. Consider booking well in advance or choosing alternative dates.
Price Trend Analysis
Prices are typically lower during shoulder seasons
Monthly Price Trends
Frequently Asked Questions
Do flights operate between SEA and BOS?
Yes. 6 direct flights operate between Seattle (SEA) and Boston (BOS).
Which airlines operate this route?
2 airlines operate this route: Delta Air Lines, Alaska Airlines.
How many flights operate daily?
3-7 flights flights operate daily on this route.
What is the average flight duration?
The average flight duration is 5h 14m - 6h 35m.
Is this route operated year-round?
This route operates with 3-7 flights daily flights.
Route data verified regularly by Triposia Travel Research Team.