Air Canada
Is AC4021 delayed?
Service date: · Actual departure date; scheduled departure unavailable (America/Los_Angeles)
Estimated arrivalLast reported
11 min early
This update may be out of date. Check with your airline.
Official source · Updated
Departure
San Francisco
SFO
Actual
Sep 16
Arrival
Calgary
YYC
Estimated
Scheduled 18:19
Sep 16
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Not available
- Estimated
- Not available
- Actual
Arrival · UTC
- Scheduled
- Estimated
- Actual
- Not available
Operating flight: UAL291
SFOYYC
Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- 16 min late
SFO → YYC
- 1 min late
SFO → YYC
- 1 min late
SFO → YYC
- 55 min late
SFO → YYC
- 8 min early
SFO → YYC
Flight history and details
Aug 17, 2026 — Sep 16, 2026
- Observed arrivals
- 6
- Arrivals over 15 minutes late
- 2
- Observed cancellations
- 0
- Observed occurrences
- 6
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 | San Francisco | Calgary | 16 | |
| Sep 14, 2026Arrived | San Francisco | Calgary | 1 | |
| Sep 12, 2026Arrived | San Francisco | Calgary | 1 | |
| Sep 10, 2026Arrived | San Francisco | Calgary | 55 | |
| Sep 9, 2026Arrived | San Francisco | Calgary | -8 | |
| Sep 8, 2026Arrived | San Francisco | Calgary | 11 |