How long is the DL20 flight?

The timetable allows 9 h 44 min. Seattle to Boston is 4,005 km (2,489 mi).

What other flight numbers does DL20 have?

Also listed as DAL20 (Delta Air Lines' ICAO code) and DL 20.

DL20 Flight Status Delta Air Lines: Seattle to Boston (DAL20)

Delta Air Lines DL 20

En-Route, Arriving in 2h31'

SEA Seattle

Scheduled: 17:03
Actual: 17:03

Terminal and gate not announced yet

Departure: Wed, Nov 4, 2026 · local time PST

Seattle Tacoma International Airport (SEA)

All SEA Departures >

BOS Boston

Scheduled: 05:40
Estimated
Delay

Terminal: 3

Arrival: Thu, Nov 5, 2026 · local time EST

Boston Logan International Airport (BOS)

All BOS Arrivals >

Departed 7h 05m ago · lands in 2h 31m 74%

SEA 17:03 BOS 05:40 ⁺¹

2,952 km (1,834 mi) flown · 1,053 km (655 mi) to go

Estimated position based on departure and arrival times, not live tracking. Times are local at each airport.

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Distance: 4005 km / 2489 miles · Scheduled Duration: 09:37

DL 20 Flight Status & Schedule Delta Air Lines Seattle to Boston

Date	From	To	Departure	Arrival	Status	Details
Nov 04	SEA	BOS	17:03	05:40	En-Route	Track >
Nov 04	SEA	BOS	17:03	02:24	Landed	Track >

Delta Air Lines flight DL 20 links Seattle and Boston, 4,005 km (2,489 mi) apart, and flies once a week, on Wednesdays. The timetable allows 9 h 44 min; there is not enough recent history yet to say how long it usually takes. Yesterday it left on time, at 17:03, and is scheduled to reach Boston at 05:40 the next morning.

< All Seattle SEA Departures All Boston BOS Arrivals >

About DL 20

Route: Seattle Tacoma International Airport SEA to Boston Logan International Airport BOS
Distance: 4,005 km (2,489 mi)
Scheduled flight time: 9 h 44 min
Flies: Wed

DL 20 FAQ

How long is the DL20 flight?: The timetable allows 9 h 44 min. Seattle to Boston is 4,005 km (2,489 mi).
Which days does DL20 fly?: Once a week, on Wednesdays, based on the schedule of the last 7 days.
What other flight numbers does DL20 have?: Also listed as DAL20 (Delta Air Lines' ICAO code) and DL 20.

DL20 and Seattle SEA to Boston BOS Flights

Other flights departing from Seattle SEA: OO4043, AS1328, AS375, UA677

Other flights arriving at Boston BOS: AS214, DL20

All flights connecting Seattle SEA to Boston BOS.