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United Airlines

Is UA4639 delayed?

UA4639 is cancelled on Nov 14. Of its last 7 arrivals, 4 landed more than 15 min late.

Last reported

Cancelled

This update may be out of date. Check with your airline.

Update time unavailable

Departure

Boise

BOI

Scheduled

Nov 14

Arrival

San Francisco

SFO

Scheduled

Nov 14

Times shown in airport local time

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

Flight details

Departure · UTC

Scheduled
Estimated
Not available
Actual
Not available

Arrival · UTC

Scheduled
Estimated
Not available
Actual
Not available

Also sold as AC3997, AC4229, NH7335, NZ9392

Recent arrivals

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

  • Boise → San Francisco

    181 min late

  • Boise → San Francisco

    254 min late

  • Boise → San Francisco

    368 min late

  • Boise → San Francisco

    On schedule (14 min behind)

  • Boise → San Francisco

    50 min late

Is UA4639 usually late?

Period: Oct 15, 2026 – Nov 14, 2026

Arrivals tracked
7
Late
4
Cancelled
1

Percentages and delay figures appear once 10 arrivals are recorded.

On time means arriving no more than 15 minutes after the scheduled time; late means more than 15 minutes after. Cancelled and diverted flights are counted apart from arrivals. Compares scheduled and actual arrival times. Cancelled and diverted flights are left out. Some flights may be missing.

How flight status works

At the airports today

San Francisco (SFO) departures

Left more than 15 min late
25 of 46
Cancelled today
41

Related flights

Other flights KBOI → SFO

All United Airlines flights

Flight history and details
UA4639 Recent arrival history
Service dateDepartureArrivalActualArrival delay (minutes)
Nov 14, 2026CancelledBoiseSan FranciscoNot availableNot available
Nov 13, 2026ArrivedBoiseSan Francisco181
Nov 12, 2026ArrivedBoiseSan Francisco254
Nov 9, 2026ArrivedBoiseSan Francisco368
Nov 8, 2026ArrivedBoiseSan Francisco14
Nov 7, 2026ArrivedBoiseSan Francisco50
Nov 6, 2026ArrivedBoiseSan Francisco3
Nov 5, 2026ArrivedBoiseSan Francisco1
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