Airlinecoop.org

Cheap flights from Boston to Seattle

49 nonstop flights a week, 7 of them today. Operated by 5 airlines, about 6h 28m in the air, 2,485 mi (4,000 km). Tickets from $170, nonstop from $242.

Flights from Boston to Seattle

Pick a departure date to see flights and seller prices

We search agencies and airlines for your day: nonstop and connecting flights, baggage, departure and arrival times.

Prices by day: Boston to Seattle

Lowest one-way price in dollars from recent searches, cheap days in green. Press a day to see flights and exact prices.

Filters

Best fares from Boston to Seattle

Lowest one-way prices found by recent searches for the next 120 days; press a card to search that date

Cheapest one-way $170 15 December 2026, with a connection Cheapest nonstop $242 15 December 2026, Alaska Airlines Cheapest in the next 7 days $290 17 November, Tue
Cheapest day of the week Tuesday $230 on average over the next 120 days
Cheapest month December 2026 tickets from $170

Boston to Seattle at a glance

flight time, from 6h 17m to 16h 12m
6h 28m
straight-line distance
2,485 mi (4,000 km)
flights a week
49
flights today
7
first and last departure
07:00 - 19:25
lowest price, with a connection, 15 December
$170
lowest nonstop price
$242
airlines
5

Boston to Seattle ticket prices by month

Lowest one-way fare found by recent searches

Cheapest month: December 2026, tickets from $170. Prices come from searches over the last few days; check the search for your exact date.

The most expensive month is November 2026: from $285. The average across months is $227.

Boston to Seattle flight schedule

49 flights a week, 7 today, 30 seasonal or one-off. Departure and arrival times are local.

FlightDepartsArrivesDurationDaysAircraft
AS 459
Alaska Airlines
07:00 Logan International, terminal B
10:28 Seattle-Tacoma International
6h 28m
Mon, Fri, Sat, Sun
Boeing 737
AS 459
Alaska Airlines
07:13 Logan International, terminal B
10:39 Seattle-Tacoma International
6h 26m
Daily
Boeing 737
DL 384
Delta
07:50 Logan International, terminal A
11:17 Seattle-Tacoma International
6h 27m
Daily
Airbus A320
AS 215
Alaska Airlines
09:00 Logan International, terminal B
12:26 Seattle-Tacoma International
6h 26m
Mon, Fri, Sat, Sun
Boeing 737-900
AS 215
Alaska Airlines
09:03 Logan International, terminal B
12:27 Seattle-Tacoma International
6h 24m
Daily
Boeing 737-900
DL 332
Delta
10:40 Logan International, terminal A
14:03 Seattle-Tacoma International
6h 23m
Daily
Airbus A320
WN 296
Southwest Airlines
10:40 Logan International, terminal B
16:05 Seattle-Tacoma International
8h 25m
Sat
DL 2889
Delta
15:45 Logan International, terminal A
19:06 Seattle-Tacoma International
6h 21m
Mon, Tue, Wed, Thu, Fri, Sun
Airbus A320
AS 257
Alaska Airlines
16:33 Logan International, terminal B
19:59 Seattle-Tacoma International
6h 26m
Sat
Boeing 737-900
AS 257
Alaska Airlines
17:44 Logan International, terminal B
21:08 Seattle-Tacoma International
6h 24m
Tue, Wed
Boeing 737
AS 257
Alaska Airlines
17:50 Logan International, terminal B
21:15 Seattle-Tacoma International
6h 25m
Sat
Boeing 737
AS 257
Alaska Airlines
18:04 Logan International, terminal B
21:29 Seattle-Tacoma International
6h 25m
Mon, Fri, Sun
Boeing 737-900
AS 257
Alaska Airlines
18:20 Logan International, terminal B
21:44 Seattle-Tacoma International
6h 24m
Mon, Thu, Fri, Sun
Boeing 737-900
DL 2889
Delta
18:35 Logan International, terminal A
22:03 Seattle-Tacoma International
6h 28m
Mon, Sun
Airbus A320
DL 2889
Delta
18:37 Logan International, terminal A
22:05 Seattle-Tacoma International
6h 28m
Sat
Airbus A320
DL 797
Delta
19:25 Logan International, terminal A
22:55 Seattle-Tacoma International
6h 30m
Mon, Tue, Wed, Thu, Fri, Sun
Airbus A320

Seasonal and one-off flights

Not operating in the next two weeks. The first of them is on 1 December.

FlightDepartsArrivesDurationDaysAircraft
UA 360
United Airlines
08:27 Logan International, terminal B
21:21 Seattle-Tacoma International
15h 54m
Seasonal
Boeing 757-200
AS 257
Alaska Airlines
18:22 Logan International, terminal B
22:00 Seattle-Tacoma International
6h 38m
Seasonal
Boeing 737
DL 797
Delta
19:26 Logan International, terminal A
22:55 Seattle-Tacoma International
6h 29m
Seasonal
Airbus A320
DL 2889
Delta
18:39 Logan International, terminal A
22:04 Seattle-Tacoma International
6h 25m
Seasonal
Airbus A320
UA 360
United Airlines
08:20 Logan International, terminal B
21:29 Seattle-Tacoma International
16h 9m
Seasonal
Boeing 757-200
AS 257
Alaska Airlines
18:09 Logan International, terminal B
21:50 Seattle-Tacoma International
6h 41m
Seasonal
Boeing 737-900
DL 384
Delta
07:30 Logan International, terminal A
11:05 Seattle-Tacoma International
6h 35m
Seasonal
Airbus A320
DL 953
Delta
10:50 Logan International, terminal A
14:20 Seattle-Tacoma International
6h 30m
Seasonal
Airbus A320
DL 797
Delta
18:15 Logan International, terminal A
21:42 Seattle-Tacoma International
6h 27m
Seasonal
Airbus A320
DL 384
Delta
07:05 Logan International, terminal A
10:43 Seattle-Tacoma International
6h 38m
Seasonal
Airbus A320
DL 797
Delta
18:30 Logan International, terminal A
22:04 Seattle-Tacoma International
6h 34m
Seasonal
Airbus A320
UA 360
United Airlines
08:30 Logan International, terminal B
21:17 Seattle-Tacoma International
15h 47m
Seasonal
Boeing 757-200
AS 257
Alaska Airlines
18:28 Logan International, terminal B
21:56 Seattle-Tacoma International
6h 28m
Seasonal
Boeing 737-900
AS 459
Alaska Airlines
07:08 Logan International, terminal B
10:30 Seattle-Tacoma International
6h 22m
Seasonal
Boeing 737-900
UA 360
United Airlines
08:15 Logan International, terminal B
21:12 Seattle-Tacoma International
15h 57m
Seasonal
Boeing 757-200
AS 1552
Alaska Airlines
09:00 Logan International, terminal B
12:22 Seattle-Tacoma International
6h 22m
Seasonal
Boeing 737-900
AS 306
Alaska Airlines
18:32 Logan International, terminal B
21:58 Seattle-Tacoma International
6h 26m
Seasonal
Boeing 737-900
UA 360
United Airlines
08:00 Logan International, terminal B
21:12 Seattle-Tacoma International
16h 12m
Seasonal
Boeing 757-200
DL 332
Delta
10:50 Logan International, terminal A
14:20 Seattle-Tacoma International
6h 30m
Seasonal
Airbus A320
DL 332
Delta
11:00 Logan International, terminal A
14:31 Seattle-Tacoma International
6h 31m
Seasonal
Airbus A320
DL 332
Delta
09:40 Logan International, terminal A
13:11 Seattle-Tacoma International
6h 31m
Seasonal
Airbus A320
DL 475
Delta
11:00 Logan International, terminal A
14:31 Seattle-Tacoma International
6h 31m
Seasonal
Airbus A320
DL 475
Delta
09:40 Logan International, terminal A
13:11 Seattle-Tacoma International
6h 31m
Seasonal
Airbus A320
AS 306
Alaska Airlines
17:00 Logan International, terminal B
20:26 Seattle-Tacoma International
6h 26m
Seasonal
Boeing 737-900
AS 1748
Alaska Airlines
19:45 Logan International, terminal B
23:11 Seattle-Tacoma International
6h 26m
Seasonal
Boeing 737-900
DL 2889
Delta
15:30 Logan International, terminal A
19:01 Seattle-Tacoma International
6h 31m
Seasonal
Airbus A320
B6 397
jetBlue
07:00 Logan International, terminal C
10:17 Seattle-Tacoma International
6h 17m
Seasonal
Airbus A321
AS 463
Alaska Airlines
15:28 Logan International, terminal B
18:50 Seattle-Tacoma International
6h 22m
Seasonal
Boeing 737-900
B6 397
jetBlue
07:10 Logan International, terminal C
10:33 Seattle-Tacoma International
6h 23m
Seasonal
Airbus A321
B6 197
jetBlue
19:29 Logan International, terminal C
22:54 Seattle-Tacoma International
6h 25m
Seasonal
Airbus A320

Days of the week are taken from the schedule for the next 14 days; schedules change by season. Seattle is 3 hours behind Boston. The search shows seat availability and the price for your date.

Airlines flying Boston to Seattle

Flights a week by schedule and the cheapest nonstop fare of each airline found by recent searches

Delta27 a week Alaska Airlines21 a week Southwest Airlines1 a week jetBluefrom 13 May United Airlinesfrom 1 December
  • Delta: 6 flights, first departure at 07:50, last at 19:25 MTWTFSS Delta Boston to Seattle
  • Alaska Airlines: 7 flights, first departure at 07:00, last at 18:20, tickets from $242 on 15 December MTWTFSS Alaska Airlines Boston to Seattle
  • Southwest Airlines: 1 flight, departs at 10:40 MTWTFSS Southwest Airlines Boston to Seattle
  • jetBlue: 2 flights, first departure at 07:00, last at 19:29 MTWTFSS
  • United Airlines: 1 flight, first departure at 08:00, last at 08:30 MTWTFSS

Airports

Where flights from Boston to Seattle depart and land

Departure from Boston

Logan International BOS

49 flights a week, terminals A, B, C, 2 mi (3 km) from the city centre

About the airport

Arrival in Seattle

Seattle-Tacoma International SEA

49 flights a week, 11 mi (18 km) from the city centre

About the airport

When to visit Seattle

Weather by month

Best time to visit: May, June, July, August and September, +17° to +25° by day. In November it is +10° by day and +5° at night, with 17 rainy days.

Jan
+8° +2° 16 days
Feb
+8° +2° 14 days
Mar
+11° +4° 15 days
Apr
+13° +6° 14 days
May
+17° +9° 11 days
Jun
+21° +12° 7 days
Jul
+25° +15° 1 days
Aug
+25° +15° 6 days
Sep
+21° +13° 7 days
Oct
+15° +9° 14 days
Nov
+10° +5° 17 days
Dec
+8° +4° 20 days

Daytime and night temperatures in °C, rainy days. Months with the most comfortable weather are in green. Long-term averages.

Frequently asked questions

How long is the flight from Boston to Seattle?
A nonstop flight takes 6 hours 28 minutes on average, from 6h 17m to 16h 12m depending on the flight.
How far is Seattle from Boston?
2,485 mi (4,000 km) in a straight line between the cities.
Which airlines fly nonstop from Boston to Seattle?
Delta (27 a week), Alaska Airlines (21 a week), Southwest Airlines (1 a week), jetBlue and United Airlines.
How many flights a day are there from Boston to Seattle?
7 flights today and 49 a week, about 7 a day on average.
When are the first and last flights from Boston to Seattle?
The first departure is at 07:00 (AS459), the last at 19:25 (DL797). Local time.
What is the cheapest month to fly from Boston to Seattle?
December 2026: tickets from $170. The most expensive is November 2026, from $285.
What is the cheapest upcoming date to fly from Boston to Seattle?
15 December 2026 (Tuesday): from $170 one way, with a connection, by recent searches. The search shows the price for your dates.
Which airline is the cheapest from Boston to Seattle?
Alaska Airlines: nonstop tickets from $242 on 15 December by recent searches. Prices change daily, so compare the sellers in the search.
What is the time difference between Boston and Seattle?
Seattle is 3 hours behind Boston. Schedule times on this page are local to each airport.
Which Boston airport do flights to Seattle leave from?
Logan International (49 a week).