Is AC4451 delayed?
Service date: · Scheduled departure date (America/New_York)
Arrived
173 min late
Official source · Updated
Departure
Dulles
IAD
Actual
Scheduled 08:20
Sep 17
Arrival
Chicago
ORD
Actual
Scheduled 09:38
Sep 17
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Estimated
- Not available
- Actual
Arrival · UTC
- Scheduled
- Estimated
- Actual
Operating flight: UAL1775
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Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- 173 min late
IAD → ORD
- 29 min early
IAD → ORD
- 42 min late
IAD → ORD
- 1 min late
IAD → ORD
- 39 min early
IAD → ORD
Flight history and details
Aug 18, 2026 — Sep 17, 2026
- Observed arrivals
- 14
- Arrivals over 15 minutes late
- 2
- Observed cancellations
- 0
- Observed occurrences
- 14
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 17, 2026Arrived | Dulles | Chicago | 173 | |
| Sep 16, 2026Arrived | Dulles | Chicago | -29 | |
| Sep 15, 2026Arrived | Dulles | Chicago | 42 | |
| Sep 14, 2026Arrived | Dulles | Chicago | 1 | |
| Sep 13, 2026Arrived | Dulles | Chicago | -39 | |
| Sep 12, 2026Arrived | Dulles | Chicago | -26 | |
| Sep 11, 2026Arrived | Dulles | Chicago | -18 | |
| Sep 10, 2026Arrived | Dulles | Chicago | -24 | |
| Sep 9, 2026Arrived | Dulles | Chicago | -31 | |
| Sep 8, 2026Arrived | Dulles | Chicago | -28 | |
| Sep 7, 2026Arrived | Dulles | Chicago | -27 | |
| Sep 6, 2026Arrived | Dulles | Chicago | -39 | |
| Sep 5, 2026Arrived | Dulles | Chicago | -21 | |
| Sep 4, 2026Arrived | Dulles | Chicago | -26 |