Is DL3991 delayed?
Each route and date is shown separately. Confirm that both airports match your booking.
Service date: · Scheduled departure date (America/Los_Angeles)
6 min late
This update may be out of date. Check with your airline.
Update time unavailable
Departure
San Francisco
SFO
Actual
Aug 29
Arrival
Seattle
SEA
Estimated
Aug 29
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Estimated
- Actual
Arrival · UTC
- Scheduled
- Estimated
- Actual
- Not available
Service date: · Scheduled departure date (America/Los_Angeles)
24 min early
Updated
Departure
Seattle
SEA
Actual
Aug 29
Arrival
San Francisco
SFO
Actual
Aug 29
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Estimated
- Actual
Arrival · UTC
- Scheduled
- Estimated
- Actual
Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- 78 min late
SFO → SEA
- 5 min early
SEA → SFO
- 15 min early
SFO → SEA
- 21 min early
SEA → SFO
- 14 min late
SFO → SEA
Flight history and details
Aug 17, 2026 — Sep 16, 2026
- Observed arrivals
- 25
- Arrivals over 15 minutes late
- 8
- Observed cancellations
- 0
- Observed occurrences
- 42
Results compare scheduled and actual arrival times. Cancelled or diverted flights are excluded. Some flights may be missing from the history.
| Service date | Departure | Arrival | Actual | Arrival delay (minutes) |
|---|---|---|---|---|
| Sep 15, 2026Arrived | San Francisco | Seattle | 78 | |
| Sep 15, 2026Arrived | Seattle | San Francisco | -5 | |
| Sep 14, 2026Arrived | San Francisco | Seattle | -15 | |
| Sep 14, 2026Arrived | Seattle | San Francisco | -21 | |
| Sep 13, 2026Arrived | San Francisco | Seattle | 14 | |
| Sep 13, 2026Arrived | Seattle | San Francisco | -3 | |
| Sep 7, 2026Arrived | San Francisco | Seattle | 4 | |
| Sep 7, 2026Arrived | Seattle | San Francisco | 15 | |
| Sep 4, 2026Arrived | San Francisco | Seattle | 58 | |
| Sep 4, 2026Arrived | Seattle | San Francisco | 54 | |
| Sep 3, 2026Arrived | San Francisco | Seattle | 2 | |
| Sep 3, 2026Arrived | Seattle | San Francisco | 23 | |
| Sep 2, 2026Arrived | San Francisco | Seattle | -17 | |
| Sep 2, 2026Arrived | Seattle | San Francisco | -16 | |
| Sep 1, 2026Arrived | Seattle | San Francisco | -12 | |
| Aug 31, 2026Arrived | Seattle | San Francisco | 47 | |
| Aug 30, 2026Arrived | Seattle | San Francisco | 17 | |
| Aug 29, 2026Arrived | Seattle | San Francisco | -24 | |
| Aug 28, 2026Arrived | Seattle | San Francisco | -12 | |
| Aug 27, 2026Arrived | Seattle | San Francisco | 15 | |
| Aug 26, 2026Arrived | Seattle | San Francisco | -22 | |
| Aug 25, 2026Arrived | Seattle | San Francisco | -14 | |
| Aug 24, 2026Arrived | Seattle | San Francisco | -17 | |
| Aug 22, 2026Arrived | Seattle | San Francisco | -14 | |
| Aug 21, 2026Arrived | Seattle | San Francisco | 0 |