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)
Arrived
104 min late
Official source · Updated
Departure
San Francisco
SFO
Actual
Scheduled 21:06
Sep 16
Arrival
Seattle
SEA
Actual
Scheduled 22:40
Sep 17
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Estimated
- Not available
- Actual
Arrival · UTC
- Scheduled
- Estimated
- Not available
- Actual
Service date: · Scheduled departure date (America/Los_Angeles)
Arrived
120 min late
Official source · Updated
Departure
Seattle
SEA
Actual
Scheduled 18:02
Sep 16
Arrival
San Francisco
SFO
Actual
Scheduled 19:40
Sep 16
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Estimated
- Not available
- 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.
- 35 min late
SFO → SEA
- 53 min late
SEA → SFO
- 104 min late
SFO → SEA
- 120 min late
SEA → SFO
- 78 min late
SFO → SEA
Flight history and details
Aug 19, 2026 — Sep 18, 2026
- Observed arrivals
- 29
- Arrivals over 15 minutes late
- 12
- Observed cancellations
- 0
- Observed occurrences
- 44
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 17, 2026Arrived | San Francisco | Seattle | 35 | |
| Sep 17, 2026Arrived | Seattle | San Francisco | 53 | |
| Sep 16, 2026Arrived | San Francisco | Seattle | 104 | |
| Sep 16, 2026Arrived | Seattle | San Francisco | 120 | |
| 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 |