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Alaska Airlines, Inc.

Is AS421 delayed?

AS421 left Seattle 2 min early, at 14:16 on Nov 14. Arrival time not confirmed yet. Of its last 24 arrivals graded against a published schedule, 13 landed more than 15 min late.

Each route and date is shown separately. Confirm that both airports match your booking.

DepartedLast reported

2 min early

This update may be out of date. Check with your airline.

Update time unavailable

Departure

Seattle

SEA

Actual

Scheduled 14:19

Nov 14

Arrival

Denver

DEN

Scheduled

Nov 14

Times shown in airport local time

Service date: · Scheduled departure date (America/Los_Angeles)

Flight details

Departure · UTC

Scheduled
Estimated
Not available
Actual

Arrival · UTC

Scheduled
Estimated
Not available
Actual
Not available

No live update yet

Showing the published schedule until live times come in.

Update time unavailable

Departure

Denver

DEN

Scheduled

Nov 14

Arrival

Seattle

SEA

Scheduled

Nov 14

Times shown in airport local time

Service date: · Scheduled departure date (America/Denver)

Flight details

Departure · UTC

Scheduled
Estimated
Not available
Actual
Not available

Arrival · UTC

Scheduled
Estimated
Not available
Actual
Not available

Route overview: Seattle → DenverSEADEN
Seattle → Denver
Route overview: Denver → SeattleDENSEA
Denver → Seattle

Recent arrivals

Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.

  • Denver → Seattle

    267 min late

  • Seattle → Denver

    266 min late

  • Denver → Seattle

    On schedule (4 min behind)

  • Seattle → Denver

    2 min early

  • Denver → Seattle

    38 min late

Is AS421 usually late?

Period: Oct 15, 2026 – Nov 14, 2026

Landings recorded
24
Graded against schedule
24
Not graded
0
On time
46%
of 24 flights
Late
54%
of 24 flights
Cancelled
0%
of 24 flights
Diverted
0%
of 24 flights
Median arrival delay
24 min
9 in 10 arrived within
106 min

On time means landing no more than 15 minutes after the scheduled arrival, late more than 15 minutes after, both times read to the minute. The percentages share one base: graded arrivals plus cancelled and diverted flights. A cancelled plan another plan of the flight replaced within 12 hours is not counted. Median and “9 in 10” are interpolated over the graded arrivals. Compares scheduled and actual arrival times, read to the minute. Some flights may be missing.

How flight status works

Departures at these airports today

Seattle (SEA) departures

Delayed: left more than 15 min after schedule
77 delayed, 37 cancelled of 246 departures
Flights from Seattle to Denver today

Denver (DEN) departures

Delayed: left more than 15 min after schedule
121 delayed, 83 cancelled of 341 departures

Related flights

All Alaska Airlines, Inc. flights

Flight history and details
AS421 Recent arrival history
Service dateDepartureArrivalActualArrival delay (minutes)
Nov 13, 2026ArrivedDenverSeattle267
Nov 13, 2026ArrivedSeattleDenver266
Nov 12, 2026ArrivedDenverSeattle4
Nov 12, 2026ArrivedSeattleDenver-2
Nov 11, 2026ArrivedDenverSeattle38
Nov 11, 2026ArrivedSeattleDenver-18
Nov 10, 2026ArrivedSeattleDenver5
Nov 9, 2026ArrivedDenverSeattle94
Nov 9, 2026ArrivedSeattleDenver-1
Nov 8, 2026ArrivedDenverSeattle47
Nov 8, 2026ArrivedSeattleDenver-7
Nov 7, 2026ArrivedDenverSeattle41
Nov 7, 2026ArrivedSeattleDenver-10
Nov 6, 2026ArrivedDenverSeattle60
Nov 6, 2026ArrivedSeattleDenver28
Nov 5, 2026ArrivedDenverSeattle28
Nov 5, 2026ArrivedSeattleDenver-2
Nov 4, 2026ArrivedDenverSeattle61
Nov 4, 2026ArrivedSeattleDenver55
Nov 3, 2026ArrivedSeattleDenver111
Nov 2, 2026ArrivedDenverSeattle15
Nov 2, 2026ArrivedSeattleDenver4
Nov 1, 2026ArrivedDenverSeattle20
Nov 1, 2026ArrivedSeattleDenver-2
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