Skip to content

United Airlines

Is UA4639 delayed?

Service date: · Scheduled departure date (UTC)

Arrived

6 min late

Official source · Updated

Departure

Boise

BOI

Actual

Scheduled 14:34

Sep 6

Arrival

San Francisco

SFO

Actual

Scheduled 09:11

Sep 6

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.

  • BOI → SFO

    25 min late

  • BOI → SFO

    13 min late

  • BOI → SFO

    43 min late

  • BOI → SFO

    43 min late

  • BOI → SFO

    62 min late
Flight history and details

Aug 24, 2026 — Sep 23, 2026

Observed arrivals
19
Arrivals over 15 minutes late
9
Observed cancellations
0
Observed occurrences
19

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

UA4639 Recent arrival history
Service dateDepartureArrivalActualArrival delay (minutes)
Sep 22, 2026ArrivedBoiseSan Francisco
25
Sep 21, 2026ArrivedBoiseSan Francisco
13
Sep 20, 2026ArrivedBoiseSan Francisco
43
Sep 19, 2026ArrivedBoiseSan Francisco
43
Sep 18, 2026ArrivedBoiseSan Francisco
62
Sep 17, 2026ArrivedBoiseSan Francisco
30
Sep 16, 2026ArrivedBoiseSan Francisco
20
Sep 15, 2026ArrivedBoiseSan Francisco
-14
Sep 14, 2026ArrivedBoiseSan Francisco
-19
Sep 13, 2026ArrivedBoiseSan Francisco
-15
Sep 12, 2026ArrivedBoiseSan Francisco
-13
Sep 11, 2026ArrivedBoiseSan Francisco
44
Sep 10, 2026ArrivedBoiseSan Francisco
-18
Sep 9, 2026ArrivedBoiseSan Francisco
13
Sep 8, 2026ArrivedBoiseSan Francisco
-18
Sep 7, 2026ArrivedBoiseSan Francisco
17
Sep 6, 2026ArrivedBoiseSan Francisco
6
Sep 5, 2026ArrivedBoiseSan Francisco
50
Sep 4, 2026ArrivedBoiseSan Francisco
-10

Essential cookies keep the site running; analytics are optional. Privacy policy