Seattle to Boston (SEA-BOS): nonstop upgrade & award space

Alaska Airlines, Delta Air Lines, and JetBlue Airways fly nonstop between Seattle (SEA) and Boston (BOS), roughly 51 times a week. The timetable below shows the nonstop scheduled at 5h 21m to 5h 37m for the 2,489 miles. 2LNR checks confirmed upgrade and award space on Alaska Airlines and Delta Air Lines flights on this route, so you can see which departures have space before you book.

Schedule last confirmed . Departure times come from 2LNR's schedule data; confirm with the airline before you book.

Updated .

See SEA to BOS on the interactive map Get started free
51
Flights a week, 4-week average
5h 21m to 5h 37m
Scheduled flight time
2,489 mi
Nonstop distance
Free
To get started

Seattle to Boston flight schedule

Scheduled nonstop departures for SEA to BOS starting October 23, 2026, last checked against our schedule feed on October 18, 2026. Airlines retime and cancel flights, so confirm with the airline before you book.

Schedule data dated .

Scheduled nonstop departures from Seattle (SEA) to Boston (BOS)
Date Flight Airline Departs SEA Arrives BOS Duration Aircraft
AS 288Alaska Airlines, Inc.07:1815:555h 37mBoeing 737-800
DL 459Delta Air Lines07:2416:005h 36mAirbus A321neo family
AS 306Alaska Airlines, Inc.09:0317:355h 32mBoeing 737-900
DL 438Delta Air Lines11:0819:415h 33mAirbus A321neo family
DL 474Delta Air Lines15:3023:585h 28mAirbus A321neo family
AS 460Alaska Airlines, Inc.15:3223:595h 27mBoeing 737-900
AS 214Alaska Airlines, Inc.23:0007:265h 26mBoeing 737 MAX 9
DL 473Delta Air Lines23:1007:355h 25mAirbus A321neo family
B6 398JetBlue Airways23:5508:165h 21mAirbus A321
AS 288Alaska Airlines, Inc.07:1815:555h 37mBoeing 737-900
DL 459Delta Air Lines07:2416:005h 36mAirbus A321neo family
AS 306Alaska Airlines, Inc.09:0317:355h 32mBoeing 737-900
DL 438Delta Air Lines13:4022:105h 30mAirbus A321neo family
AS 460Alaska Airlines, Inc.15:3223:595h 27mBoeing 737 MAX 9
AS 214Alaska Airlines, Inc.23:0007:265h 26mBoeing 737-900
DL 473Delta Air Lines23:1007:355h 25mAirbus A321neo family
B6 398JetBlue Airways23:5308:145h 21mAirbus A321
AS 288Alaska Airlines, Inc.07:1815:555h 37mBoeing 737 MAX 9
DL 459Delta Air Lines07:2416:005h 36mAirbus A321neo family
AS 306Alaska Airlines, Inc.09:0317:355h 32mBoeing 737-900
DL 438Delta Air Lines11:0819:415h 33mAirbus A321neo family
DL 474Delta Air Lines15:3023:585h 28mAirbus A321neo family
AS 460Alaska Airlines, Inc.15:3223:595h 27mBoeing 737 MAX 9
AS 214Alaska Airlines, Inc.23:0007:265h 26mBoeing 737 MAX 9
DL 473Delta Air Lines23:1007:355h 25mAirbus A321neo family
AS 288Alaska Airlines, Inc.07:1815:555h 37mBoeing 737 MAX 9
DL 459Delta Air Lines07:2416:005h 36mAirbus A321neo family
AS 306Alaska Airlines, Inc.09:0317:355h 32mBoeing 737 MAX 9
DL 438Delta Air Lines11:0819:415h 33mAirbus A321neo family
DL 474Delta Air Lines15:3023:585h 28mAirbus A321neo family
AS 460Alaska Airlines, Inc.15:3223:595h 27mBoeing 737 MAX 9
AS 214Alaska Airlines, Inc.23:0007:265h 26mBoeing 737-800
DL 473Delta Air Lines23:1007:355h 25mAirbus A321neo family
AS 288Alaska Airlines, Inc.07:1815:555h 37mBoeing 737 MAX 9
DL 459Delta Air Lines07:2416:005h 36mAirbus A321neo family
AS 306Alaska Airlines, Inc.09:0317:355h 32mBoeing 737 MAX 9
DL 438Delta Air Lines11:0819:415h 33mAirbus A321neo family
DL 474Delta Air Lines15:3023:585h 28mAirbus A321neo family
AS 460Alaska Airlines, Inc.15:3223:595h 27mBoeing 737 MAX 9
AS 214Alaska Airlines, Inc.23:0007:265h 26mBoeing 737 MAX 9

Showing the first 40 of 57 scheduled SEA to BOS departures across 7 days with service, starting October 23, 2026. Every remaining date is on the interactive map.

Departure and arrival times are local at their own airport, so an arrival can fall on a different local date than the departure; the duration column is the true elapsed flying time. A dash means the airline hasn't filed that value in the schedule data we hold. Aircraft are the equipment the airline filed, named where the code pins down one type and shown as the family or the bare code where it doesn't. Swaps can happen up to departure.

See every SEA to BOS date on the interactive map

Aircraft on the Seattle to Boston nonstop

In the schedule table on this page, Alaska Airlines flies the Boeing 737 MAX 9, the Boeing 737-900, and the Boeing 737-800. Delta Air Lines flies the Airbus A321neo family. JetBlue Airways flies the Airbus A321. Each linked aircraft page shows where that airline schedules it. Airlines can swap aircraft up to departure.

Confirmed upgrade & award space on SEA to BOS departures

2LNR tracks confirmed upgrade and award space on Alaska Airlines and Delta Air Lines, segment by segment and date by date. Open the calendar for Seattle to Boston to see which departures have space, the next 14 days free on every product and the full horizon on Pro.

In the 7 days to October 19, 2026, 2LNR checked award space on Seattle to Boston departures from October 19 to November 1. Alaska Airlines had space open on 8 of 14 dates checked, Delta Air Lines on 14 of 14 and JetBlue Airways on 3 of 6.

See real availability

Confirmed upgrade or award seats by date on the SEA to BOS departures 2LNR tracks, checked against live inventory so you know what's open before you book.

Set an alert

Premium inventory turns over fast. Watch this route on Pro and 2LNR notifies you when space appears on a date you're tracking.

Plan on the map

See SEA to BOS on the interactive route map, with schedules, connections, and route statistics.

Airlines flying Seattle to Boston nonstop

Carriers operating SEA to BOS nonstop in the current schedule. Where 2LNR tracks the carrier, its departures show confirmed upgrade or award space by date.

See SEA to BOS on the interactive map →

Frequently asked questions about SEA to BOS

How long is the flight from Seattle (SEA) to Boston (BOS)?
Scheduled flight times from Seattle (SEA) to Boston (BOS) run from 5h 21m to 5h 37m across the departures in the schedule table on this page. The nonstop covers about 2,489 miles, and airlines adjust scheduled times by season, so confirm with the airline before you book.
Which airlines fly nonstop from SEA to BOS?
Alaska Airlines, Delta Air Lines, and JetBlue Airways fly SEA to BOS nonstop. 2LNR tracks confirmed upgrade and award space on Alaska Airlines and Delta Air Lines, and award seats on JetBlue Airways.
How many flights a week are there from SEA to BOS?
About 51 nonstop flights a week run between Seattle (SEA) and Boston (BOS) in the current schedule, operated by Alaska Airlines, Delta Air Lines, and JetBlue Airways. Frequency shifts by season, and the schedule table on this page shows what is scheduled next.
What time do flights from SEA to BOS depart?
Scheduled SEA to BOS nonstops in the next 7 days with service leave between 07:18 and 23:55, local time at Seattle. The schedule table on this page lists every departure by date, with its arrival time and aircraft.
Which flights operate SEA to BOS nonstop?
The schedule table on this page lists 9 flight numbers for SEA to BOS nonstops, including AS 214, AS 288, AS 306, and AS 460 on Alaska Airlines, and DL 438, DL 459, DL 473, and DL 474 on Delta Air Lines. The table lists each departure by date with its times and aircraft.
How do I check upgrade or award availability on SEA to BOS?
Open the SEA to BOS route on the interactive map or the matrix to see confirmed upgrade and award space by date on Alaska Airlines and Delta Air Lines, the next 14 days free and the full horizon on Pro. On Pro you can also set an alert on the route and 2LNR notifies you when space opens.

Never miss SEA to BOS upgrade or award space

See what's open by date on this route, the next 14 days free on every product and the full horizon on Pro.

Get started free