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United Airlines

Is UA639 delayed?

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

Arrived

4 min late

Official source · Updated

Departure

San Francisco

SFO

Actual

Scheduled 12:42

Sep 16

Arrival

San Antonio

SAT

Actual

Scheduled 22:53

Sep 16

Times shown in airport local time

Flight details

Departure · UTC

Scheduled
Estimated
Not available
Actual

Arrival · UTC

Scheduled
Estimated
Not available
Actual
View this flight’s market

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.

  • SFO → SAT

    4 min late

  • BOS → LAX

    44 min late

  • BOS → LAX

    136 min late

  • SFO → SAT

    6 min early

  • BOS → LAX

    131 min late
Flight history and details

Aug 17, 2026 — Sep 16, 2026

Observed arrivals
23
Arrivals over 15 minutes late
17
Observed cancellations
0
Observed occurrences
25

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

UA639 Recent arrival history
Service dateDepartureArrivalActualArrival delay (minutes)
Sep 16, 2026ArrivedSan FranciscoSan Antonio
View this flight’s market
4
Sep 14, 2026ArrivedBostonLos Angeles
44
Sep 13, 2026ArrivedBostonLos Angeles
136
Sep 12, 2026ArrivedSan FranciscoSan Antonio
-6
Sep 11, 2026ArrivedBostonLos Angeles
131
Sep 10, 2026ArrivedBostonLos Angeles
39
Sep 9, 2026ArrivedSan FranciscoSan Antonio
28
Sep 6, 2026ArrivedRenoSan Francisco
52
Sep 5, 2026ArrivedRenoSan Francisco
10
Sep 4, 2026ArrivedRenoSan Francisco
19
Sep 3, 2026ArrivedRenoSan Francisco
98
Sep 2, 2026ArrivedRenoSan Francisco
17
Sep 1, 2026ArrivedRenoSan Francisco
-3
Aug 30, 2026ArrivedRenoSan Francisco
68
Aug 29, 2026ArrivedRenoSan Francisco
116
Aug 28, 2026ArrivedRenoSan Francisco
32
Aug 27, 2026ArrivedRenoSan Francisco
32
Aug 26, 2026ArrivedRenoSan Francisco
-16
Aug 25, 2026ArrivedRenoSan Francisco
15
Aug 23, 2026ArrivedRenoSan Francisco
53
Aug 22, 2026ArrivedRenoSan Francisco
19
Aug 21, 2026ArrivedRenoSan Francisco
57

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