How long is the KL6021 flight?

The timetable allows 9 h 50 min. Seattle to Boston is 4,005 km (2,489 mi).

What other flight numbers does KL6021 have?

Also listed as KLM6021 (KLM's ICAO code) and KL 6021.

KL6021 Flight Status KLM: Seattle to Boston (KLM6021)

Are you looking for the November 9th, 2026 KL 6021 Seattle to London flight? Go to our KL6021 Seattle to London Flight Status page >

KL 6021 Seattle to Boston Flight Status

Not scheduled today (November 9th, 2026). Latest flight: November 4th, 2026 ; recent history is in the table below.

KL 6021 Flight Status & Schedule KLM Seattle to Boston

Date	From	To	Departure	Arrival	Status	Details
Nov 04	SEA	BOS	17:03	02:24	Landed	Track >

KLM operates KL 6021 from Seattle to Boston, a 4,005 km (2,489 mi) trip, once a week, on Wednesdays. The timetable allows 9 h 50 min; there is not enough recent history yet to say how long it usually takes. It is not flying today; the last flight, on Wednesday, landed on time.

< All Seattle SEA Departures All Boston BOS Arrivals >

About KL 6021

Route: Seattle Tacoma International Airport SEA to Boston Logan International Airport BOS
Distance: 4,005 km (2,489 mi)
Scheduled flight time: 9 h 50 min
Flies: Wed

KL 6021 FAQ

How long is the KL6021 flight?: The timetable allows 9 h 50 min. Seattle to Boston is 4,005 km (2,489 mi).
Which days does KL6021 fly?: Once a week, on Wednesdays, based on the schedule of the last 7 days.
What other flight numbers does KL6021 have?: Also listed as KLM6021 (KLM's ICAO code) and KL 6021.

KL6021 and Seattle SEA to Boston BOS Flights

Flight KL6021 is a code-share KLM flight of the Delta Air Lines operated DL20.

Other flights departing from Seattle SEA: DL20, DL20

Other flights arriving at Boston BOS: AS214, DL20, DL20

All flights connecting Seattle SEA to Boston BOS.