China Southern Airlines
Is CZ1637 delayed?
Service date: · Actual departure date; scheduled departure unavailable (America/New_York)
Arrived
31 min early
Official source · Updated
Departure
Philadelphia
PHL
Actual
Sep 7
Arrival
San Francisco
SFO
Actual
Scheduled 21:09
Sep 7
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Not available
- Estimated
- Not available
- Actual
Arrival · UTC
- Scheduled
- Estimated
- Actual
Operating flight: AAL2506
Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- 80 min late
PHL → SFO
- 25 min early
PHL → SFO
- 8 min late
PHL → SFO
- 20 min late
PHL → SFO
- 25 min early
PHL → SFO
Flight history and details
Aug 23, 2026 — Sep 22, 2026
- Observed arrivals
- 11
- Arrivals over 15 minutes late
- 4
- Observed cancellations
- 0
- Observed occurrences
- 11
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 21, 2026Arrived | Philadelphia | San Francisco | 80 | |
| Sep 19, 2026Arrived | Philadelphia | San Francisco | -25 | |
| Sep 17, 2026Arrived | Philadelphia | San Francisco | 8 | |
| Sep 15, 2026Arrived | Philadelphia | San Francisco | 20 | |
| Sep 14, 2026Arrived | Philadelphia | San Francisco | -25 | |
| Sep 12, 2026Arrived | Philadelphia | San Francisco | -16 | |
| Sep 10, 2026Arrived | Philadelphia | San Francisco | -27 | |
| Sep 8, 2026Arrived | Philadelphia | San Francisco | -34 | |
| Sep 7, 2026Arrived | Philadelphia | San Francisco | -31 | |
| Sep 5, 2026Arrived | Philadelphia | San Francisco | 49 | |
| Sep 3, 2026Arrived | Philadelphia | San Francisco | 63 |