Is UA4639 delayed?
Service date: · Scheduled departure date (UTC)
Arrived
15 min early
Official source · Updated
Departure
Boise
BOI
Actual
Scheduled 14:34
Sep 13
Arrival
San Francisco
SFO
Actual
Scheduled 09:11
Sep 13
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Estimated
- Not available
- Actual
Arrival · UTC
- Scheduled
- Estimated
- Actual
BOISFO
Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- 14 min early
BOI → SFO
- 19 min early
BOI → SFO
- 15 min early
BOI → SFO
- 13 min early
BOI → SFO
- 44 min late
BOI → SFO
Flight history and details
Aug 17, 2026 — Sep 16, 2026
- Observed arrivals
- 12
- Arrivals over 15 minutes late
- 3
- Observed cancellations
- 0
- Observed occurrences
- 12
Results compare scheduled and actual arrival times. Cancelled or diverted flights are excluded. Some flights may be missing from the history.
| Service date | Departure | Arrival | Actual | Arrival delay (minutes) |
|---|---|---|---|---|
| Sep 15, 2026Arrived | Boise | San Francisco | -14 | |
| Sep 14, 2026Arrived | Boise | San Francisco | -19 | |
| Sep 13, 2026Arrived | Boise | San Francisco | -15 | |
| Sep 12, 2026Arrived | Boise | San Francisco | -13 | |
| Sep 11, 2026Arrived | Boise | San Francisco | 44 | |
| Sep 10, 2026Arrived | Boise | San Francisco | -18 | |
| Sep 9, 2026Arrived | Boise | San Francisco | 13 | |
| Sep 8, 2026Arrived | Boise | San Francisco | -18 | |
| Sep 7, 2026Arrived | Boise | San Francisco | 17 | |
| Sep 6, 2026Arrived | Boise | San Francisco | 6 | |
| Sep 5, 2026Arrived | Boise | San Francisco | 50 | |
| Sep 4, 2026Arrived | Boise | San Francisco | -10 |