Is DL21 delayed?
DL21 is listed as cancelled on Sep 30.
Usually on time: arrived within 15 min of schedule on 11 of the last 15 flights.
Cancelled
This update may be out of date. Check with your airline.
Update time unavailable
Departure
London
LHR
Scheduled
Sep 30
Arrival
Seattle
SEA
Scheduled
Sep 30
Times shown in airport local time
Service date: · Scheduled departure date (Europe/London)
Awaiting settlement against the airport’s record of this flight.
Flight details
Departure · UTC
- Scheduled
- Estimated
- Not available
- Actual
- Not available
Arrival · UTC
- Scheduled
- Estimated
- Not available
- Actual
- Not available
Market prices express trading expectations about a contract’s stated threshold. They do not confirm airline status. The linked market shows its terms and activity.
Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- <1 min early
London → Seattle
- 18 min late
London → Seattle
- 30 min late
London → Seattle
- 5 min early
London → Seattle
- 17 min early
London → Seattle
Is DL21 usually late?
Observation window: Sep 1, 2026 – Oct 1, 2026
On time means arriving no more than 15 minutes after the scheduled time; late means more than 15 minutes after. Cancelled and diverted flights are counted apart from arrivals. Results compare scheduled and actual arrival times. Cancelled or diverted flights are excluded. Some flights may be missing from the history.
At the airports today
London Heathrow (LHR) departures
- Left more than 15 min late
- 0 of 0
- Cancelled today
- 1
Seattle (SEA) departures
- Left more than 15 min late
- 94 of 324
- Cancelled today
- 2
Related flights
Flight history and details
| Service date | Departure | Arrival | Actual | Arrival delay (minutes) |
|---|---|---|---|---|
| Sep 30, 2026Cancelled | London | Seattle | Not available | Not available |
| Sep 29, 2026Arrived | London | Seattle | 0 | |
| Sep 23, 2026Arrived | London | Seattle | 18 | |
| Sep 22, 2026Arrived | London | Seattle | 30 | |
| Sep 20, 2026Arrived | London | Seattle | -5 | |
| Sep 12, 2026Arrived | London | Seattle | -17 | |
| Sep 11, 2026Arrived | London | Seattle | -24 | |
| Sep 10, 2026Arrived | London | Seattle | 115 | |
| Sep 8, 2026Arrived | London | Seattle | 216 | |
| Sep 7, 2026Arrived | London | Seattle | -15 | |
| Sep 6, 2026Arrived | London | Seattle | -40 | |
| Sep 5, 2026Arrived | London | Seattle | -38 | |
| Sep 4, 2026Arrived | London | Seattle | -8 | |
| Sep 3, 2026Arrived | London | Seattle | -42 | |
| Sep 2, 2026Arrived | London | Seattle | -39 | |
| Sep 1, 2026Arrived | London | Seattle | -19 |
Email me if DL21 runs late
We email you if your next DL21 flight in the coming day is more than 15 minutes late, cancelled or diverted. Alerts last 30 days. No account needed.