Delta Air Lines
Is DL21 delayed?
No delay reported yet. DL21 is scheduled to leave London at 12:20 on Nov 15 and reach Seattle at 14:29 (as of Nov 15, 08:09 UTC).
Usually on time: 18 of its last 27 graded arrivals landed within 15 min of schedule. We say “usually” only from 20 graded arrivals, with two in three or more on one side.
No live update yet
Showing the published schedule until live times come in.
Update time unavailable
Departure
London
LHR
Scheduled
Nov 15
Arrival
Seattle
SEA
Scheduled
Nov 15
Times shown in airport local time
Service date: · Scheduled departure date (Europe/London)
Flight details
Departure · UTC
- Scheduled
- Estimated
- Not available
- Actual
- Not available
Arrival · UTC
- Scheduled
- Estimated
- Not available
- Actual
- Not available
Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- 164 min late
London → Seattle
- 25 min late
London → Seattle
- 20 min late
London → Seattle
- 9 min early
London → Seattle
- On schedule (5 min behind)
London → Seattle
Is DL21 usually late?
Period: Oct 16, 2026 – Nov 15, 2026
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.
Departures on record at these airports today
London Heathrow (LHR) departures
- Delayed: took off more than 27 min after schedule (15 min plus the usual 12-min taxi)
- 4 delayed, 1 cancelled of 51 departures on record
Seattle (SEA) departures
Too few departures on record with a known outcome so far today to judge: 1 of 20 needed.
Counts cover the departures on record at each airport, not its full schedule.
Related flights
Flight history and details
| Service date | Departure | Arrival | Actual | Arrival delay (minutes) |
|---|---|---|---|---|
| Nov 14, 2026Arrived | London | Seattle | 164 | |
| Nov 13, 2026Arrived | London | Seattle | 25 | |
| Nov 12, 2026Arrived | London | Seattle | 20 | |
| Nov 11, 2026Arrived | London | Seattle | -9 | |
| Nov 10, 2026Arrived | London | Seattle | 5 | |
| Nov 9, 2026Arrived | London | Seattle | 133 | |
| Nov 8, 2026Arrived | London | Seattle | 11 | |
| Nov 7, 2026Arrived | London | Seattle | 3 | |
| Nov 6, 2026Arrived | London | Seattle | 45 | |
| Nov 5, 2026Arrived | London | Seattle | -24 | |
| Nov 4, 2026Arrived | London | Seattle | -17 | |
| Nov 2, 2026Arrived | London | Seattle | 4 | |
| Nov 1, 2026Arrived | London | Seattle | 11 | |
| Oct 31, 2026Arrived | London | Seattle | -39 | |
| Oct 30, 2026Arrived | London | Seattle | -41 | |
| Oct 29, 2026Arrived | London | Seattle | -12 | |
| Oct 28, 2026Arrived | London | Seattle | 14 | |
| Oct 26, 2026Arrived | London | Seattle | -11 | |
| Oct 25, 2026Arrived | London | Seattle | -4 | |
| Oct 24, 2026Arrived | London | Seattle | -8 | |
| Oct 23, 2026Arrived | London | Seattle | 28 | |
| Oct 22, 2026Cancelled | London | Seattle | Not available | Not available |
| Oct 21, 2026Arrived | London | Seattle | 18 | |
| Oct 20, 2026Arrived | London | Seattle | -36 | |
| Oct 19, 2026Arrived | London | Seattle | -33 | |
| Oct 18, 2026Arrived | London | Seattle | 90 | |
| Oct 17, 2026Arrived | London | Seattle | 15 | |
| Oct 16, 2026Arrived | London | Seattle | 27 |