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Delta Air Lines

Is DL3991 delayed?

No delay reported yet. DL3991 is scheduled to leave Seattle at 18:17 on Nov 15 and reach San Francisco at 20:00 (as of Nov 15, 13:30 UTC). Of its last 23 arrivals graded against a published schedule, 9 landed more than 15 min late.

No live update yet

Showing the published schedule until live times come in.

Update time unavailable

Departure

Seattle

SEA

Scheduled

Nov 15

Arrival

San Francisco

SFO

Scheduled

Nov 15

Times shown in airport local time

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

Flight details

Departure · UTC

Scheduled
Estimated
Not available
Actual
Not available

Arrival · UTC

Scheduled
Estimated
Not available
Actual
Not available

Also sold as AF2251, KL6277, VS3214, WS8631

Route overview: Seattle → San FranciscoSEASFO
Seattle → San Francisco

Recent arrivals

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

  • San Francisco → Seattle

    On schedule (13 min behind)

  • Seattle → San Francisco

    On schedule (10 min behind)

  • San Francisco → Seattle

    113 min late

  • Seattle → San Francisco

    158 min late

  • San Francisco → Seattle

    5 min early

Is DL3991 usually late?

Period: Oct 16, 2026 – Nov 15, 2026

Landings recorded
29
Graded against schedule
23
Not graded
6
On time
56%
of 25 flights
Late
36%
of 25 flights
Cancelled
8%
of 25 flights
Diverted
0%
of 25 flights
Median arrival delay
10 min
9 in 10 arrived within
68 min

Not graded: 6, with no published arrival schedule to compare against. They are in no other figure.

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 on record at these airports today

Seattle (SEA) departures

Too few departures on record with a known outcome so far today to judge: 7 of 20 needed.

Flights from Seattle to San Francisco today

San Francisco (SFO) departures

Too few departures on record with a known outcome so far today to judge: 8 of 20 needed.

Counts cover the departures on record at each airport, not its full schedule.

Related flights

All Delta Air Lines flights

Flight history and details
DL3991 Recent arrival history
Service dateDepartureArrivalActualArrival delay (minutes)
Nov 13, 2026CancelledSan FranciscoSeattleNot availableNot available
Nov 13, 2026CancelledSeattleSan FranciscoNot availableNot available
Nov 12, 2026ArrivedSan FranciscoSeattle13
Nov 12, 2026ArrivedSeattleSan Francisco10
Nov 11, 2026ArrivedSan FranciscoSeattle113
Nov 11, 2026ArrivedSeattleSan Francisco158
Nov 10, 2026ArrivedSan FranciscoSeattle-5
Nov 10, 2026ArrivedSeattleSan Francisco21
Nov 9, 2026ArrivedSan FranciscoSeattle18
Nov 9, 2026ArrivedSeattleSan Francisco-2
Nov 8, 2026ArrivedSan FranciscoSeattle3
Nov 8, 2026ArrivedSeattleSan Francisco-5
Oct 30, 2026ArrivedSan FranciscoSeattle9
Oct 29, 2026ArrivedSan FranciscoSeattle10
Oct 28, 2026ArrivedSan FranciscoSeattle-3
Oct 27, 2026ArrivedSan FranciscoSeattle-11
Oct 26, 2026ArrivedSan FranciscoSeattle22
Oct 25, 2026ArrivedSan FranciscoSeattle5
Oct 23, 2026ArrivedSan FranciscoSeattle24
Oct 22, 2026ArrivedSan FranciscoSeattle76
Oct 21, 2026ArrivedSan FranciscoSeattle-4
Oct 20, 2026ArrivedSan FranciscoSeattle8
Oct 19, 2026ArrivedSan FranciscoSeattle-15
Oct 18, 2026ArrivedSan FranciscoSeattle31
Oct 16, 2026ArrivedSan FranciscoSeattle36
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