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Delta Air Lines

Is DL4031 delayed?

Each route and date is shown separately. Confirm that both airports match your booking.

Service date: · Scheduled departure date (UTC)

Arrived

11 min late

Official source · Updated

Departure

Ontario

ONT

Actual

Scheduled 22:37

Sep 6

Arrival

Seattle

SEA

Actual

Scheduled 17:42

Sep 6

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

15 min early

Official source · Updated

Departure

Seattle

SEA

Actual

Scheduled 11:51

Sep 6

Arrival

Ontario

ONT

Actual

Scheduled 21:08

Sep 6

Times shown in airport local time

Flight details

Departure · UTC

Scheduled
Estimated
Not available
Actual

Arrival · UTC

Scheduled
Estimated
Not available
Actual

Recent arrivals

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

  • ONT → SEA

    12 min late

  • SEA → ONT

    1 min early

  • ONT → SEA

    4 min early

  • SEA → ONT

    13 min early

  • ONT → SEA

    25 min late
Flight history and details

Aug 18, 2026 — Sep 17, 2026

Observed arrivals
29
Arrivals over 15 minutes late
7
Observed cancellations
0
Observed occurrences
41

Results compare scheduled and actual arrival times. Cancelled or diverted flights are excluded. Some flights may be missing from the history.

How flight status works

DL4031 Recent arrival history
Service dateDepartureArrivalActualArrival delay (minutes)
Sep 17, 2026ArrivedOntarioSeattle
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12
Sep 16, 2026ArrivedSeattleOntario
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-1
Sep 16, 2026ArrivedOntarioSeattle
-4
Sep 15, 2026ArrivedSeattleOntario
-13
Sep 15, 2026ArrivedOntarioSeattle
25
Sep 14, 2026ArrivedSeattleOntario
-20
Sep 14, 2026ArrivedOntarioSeattle
66
Sep 13, 2026ArrivedOntarioSeattle
-19
Sep 12, 2026ArrivedOntarioSeattle
10
Sep 11, 2026ArrivedSeattleOntario
-26
Sep 11, 2026ArrivedOntarioSeattle
23
Sep 10, 2026ArrivedSeattleOntario
1
Sep 10, 2026ArrivedOntarioSeattle
31
Sep 9, 2026ArrivedSeattleOntario
-6
Sep 9, 2026ArrivedOntarioSeattle
0
Sep 8, 2026ArrivedSeattleOntario
-11
Sep 8, 2026ArrivedOntarioSeattle
2
Sep 7, 2026ArrivedSeattleOntario
-21
Sep 6, 2026ArrivedOntarioSeattle
11
Sep 6, 2026ArrivedSeattleOntario
-15
Sep 5, 2026ArrivedOntarioSeattle
2
Sep 5, 2026ArrivedSeattleOntario
3
Sep 5, 2026ArrivedOntarioSeattle
1
Sep 4, 2026ArrivedSeattleOntario
14
Sep 4, 2026ArrivedOntarioSeattle
13
Sep 3, 2026ArrivedSeattleOntario
315
Sep 1, 2026ArrivedSeattleOntario
64
Aug 31, 2026ArrivedSeattleOntario
1
Aug 26, 2026ArrivedSeattleOntario
17

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