United Airlines
Is UA4459 delayed?
Each route and date is shown separately. Confirm that both airports match your booking.
Service date: · Scheduled departure date (America/New_York)
Cancelled
This update may be out of date. Check with your airline.
Update time unavailable
Departure
Dulles
IAD
Scheduled
Sep 21
Arrival
Philadelphia
PHL
Estimated
Sep 21
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Estimated
- Not available
- Actual
- Not available
Arrival · UTC
- Scheduled
- Estimated
- Actual
- Not available
Service date: · Scheduled departure date (UTC)
17 min late
Official source · Updated
Departure
Ottawa
YOW
Scheduled
Sep 21
Arrival
Dulles
IAD
Actual
Sep 21
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Estimated
- Not available
- Actual
- Not available
Arrival · UTC
- Scheduled
- Estimated
- Not available
- Actual
Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- 8 min early
IAD → PHL
- 8 min early
YOW → IAD
- 17 min late
YOW → IAD
- 20 min late
IAD → PHL
- 7 min early
YOW → IAD
Flight history and details
Aug 23, 2026 — Sep 22, 2026
- Observed arrivals
- 32
- Arrivals over 15 minutes late
- 3
- Observed cancellations
- 1
- Observed occurrences
- 33
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 22, 2026Arrived | Dulles | Philadelphia | -8 | |
| Sep 22, 2026Arrived | Ottawa | Dulles | -8 | |
| Sep 21, 2026Cancelled | Dulles | Philadelphia | Not available | Not available |
| Sep 21, 2026Arrived | Ottawa | Dulles | 17 | |
| Sep 20, 2026Arrived | Dulles | Philadelphia | 20 | |
| Sep 20, 2026Arrived | Ottawa | Dulles | -7 | |
| Sep 19, 2026Arrived | Dulles | Philadelphia | -22 | |
| Sep 19, 2026Arrived | Ottawa | Dulles | -20 | |
| Sep 18, 2026Arrived | Dulles | Philadelphia | -15 | |
| Sep 18, 2026Arrived | Ottawa | Dulles | -15 | |
| Sep 17, 2026Arrived | Dulles | Philadelphia | 100 | |
| Sep 17, 2026Arrived | Ottawa | Dulles | -18 | |
| Sep 16, 2026Arrived | Dulles | Philadelphia | -25 | |
| Sep 16, 2026Arrived | Ottawa | Dulles | -22 | |
| Sep 15, 2026Arrived | Dulles | Philadelphia | -25 | |
| Sep 15, 2026Arrived | Ottawa | Dulles | -6 | |
| Sep 14, 2026Arrived | Dulles | Philadelphia | -19 | |
| Sep 14, 2026Arrived | Ottawa | Dulles | -7 | |
| Sep 13, 2026Arrived | Dulles | Philadelphia | -18 | |
| Sep 13, 2026Arrived | Ottawa | Dulles | -20 | |
| Sep 12, 2026Arrived | Ottawa | Dulles | -24 | |
| Sep 11, 2026Arrived | Dulles | Philadelphia | -13 | |
| Sep 11, 2026Arrived | Ottawa | Dulles | -27 | |
| Sep 10, 2026Arrived | Dulles | Philadelphia | -29 | |
| Sep 10, 2026Arrived | Ottawa | Dulles | -24 | |
| Sep 9, 2026Arrived | Dulles | Philadelphia | -19 | |
| Sep 9, 2026Arrived | Ottawa | Dulles | -30 | |
| Sep 8, 2026Arrived | Dulles | Philadelphia | -26 | |
| Sep 8, 2026Arrived | Ottawa | Dulles | -30 | |
| Sep 7, 2026Arrived | Ottawa | Dulles | -25 | |
| Sep 6, 2026Arrived | Ottawa | Dulles | -14 | |
| Sep 5, 2026Arrived | Ottawa | Dulles | -20 | |
| Sep 4, 2026Arrived | Ottawa | Dulles | 4 |