AS643 Flight Status Alaska Airlines: Denver to Seattle (ASA643)

Are you looking for the November 9th, 2026 AS 643 San Jose del Cabo to San Diego flight? Go to our AS643 San Jose del Cabo to San Diego Flight Status page >

AS 643 Denver to Seattle Flight Status

Not scheduled today (November 9th, 2026). Latest flight: August 18th, 2026 ; recent history is in the table below.

AS 643 Flight Status & Schedule Alaska Airlines Denver to Seattle

Date From To Departure Arrival Status Details
Aug 18 DEN SEA 06:08 07:40 Landed Track >
Aug 17 DEN SEA 06:13 07:40 Landed Track >
Aug 16 DEN SEA 06:14 07:36 Landed Track >
Aug 15 DEN SEA 06:09 07:27 Landed Track >
Aug 14 DEN SEA 06:15 07:34 Landed Track >
Aug 13 DEN SEA 06:11 07:33 Landed Track >
Aug 12 DEN SEA 06:07 07:33 Landed Track >
Aug 11 DEN SEA 06:06 07:35 Landed Track >
Aug 10 DEN SEA 06:08 07:33 Landed Track >
Aug 09 DEN SEA 06:13 07:38 Landed Track >

Alaska Airlines flight AS 643 links Denver and Seattle, 1,645 km (1,022 mi) apart. With 3 h 3 min in the timetable and a usual flight time of about 2 h 25 min, it often makes up time. It is not flying today; the last flight, on 18 August 2026, landed on time.

< All Denver DEN Departures All Seattle SEA Arrivals >

About AS 643

Route
Denver International Airport DEN to Seattle Tacoma International Airport SEA
Distance
1,645 km (1,022 mi)
Typical flight time
2 h 25 min
On time
10 of the last 10

AS 643 FAQ

How long is the AS643 flight?
The timetable allows 3 h 3 min. Denver to Seattle is 1,645 km (1,022 mi).
How often is AS643 late?
None of the last 10 flights arrived 15 or more minutes late.
What other flight numbers does AS643 have?
Also listed as ASA643 (Alaska Airlines' ICAO code) and AS 643.

AS643 and Denver DEN to Seattle SEA Flights

Flight AS643 is code-shared by 2 airlines using the flight numbers CX7841, QR2036

Other flights departing from Denver DEN: UA4745, AS1617, OO5192, AS432

Other flights arriving at Seattle SEA: AS1529, AS323, AS1444, AS1409

All flights connecting Denver DEN to Seattle SEA.