Is UA4187 delayed?
Service date: · Scheduled departure date (UTC)
Arrived
15 min early
Official source · Updated
Departure
Dayton
DAY
Actual
Scheduled 19:04
Sep 22
Arrival
Dulles
IAD
Actual
Scheduled 16:16
Sep 22
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Estimated
- Not available
- Actual
Arrival · UTC
- Scheduled
- Estimated
- Not available
- Actual
DAYIAD
Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- 25 min late
DAY → IAD
- 15 min early
DAY → IAD
- 4 min late
DAY → IAD
- 1 min early
DAY → IAD
- 81 min late
DAY → IAD
Flight history and details
Aug 24, 2026 — Sep 23, 2026
- Observed arrivals
- 19
- Arrivals over 15 minutes late
- 3
- Observed cancellations
- 3
- Observed occurrences
- 29
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 23, 2026Arrived | Dayton | Dulles | 25 | |
| Sep 22, 2026Arrived | Dayton | Dulles | -15 | |
| Sep 21, 2026Arrived | Dayton | Dulles | 4 | |
| Sep 20, 2026Arrived | Dayton | Dulles | -1 | |
| Sep 19, 2026Arrived | Dayton | Dulles | 81 | |
| Sep 18, 2026Arrived | Dayton | Dulles | -7 | |
| Sep 17, 2026Arrived | Dayton | Dulles | 35 | |
| Sep 16, 2026Arrived | Dayton | Dulles | -21 | |
| Sep 14, 2026Arrived | Dayton | Dulles | -22 | |
| Sep 12, 2026Arrived | Dayton | Dulles | -14 | |
| Sep 11, 2026Arrived | Dayton | Dulles | -5 | |
| Sep 10, 2026Arrived | Dayton | Dulles | -20 | |
| Sep 9, 2026Arrived | Dayton | Dulles | -26 | |
| Sep 8, 2026Arrived | Little Rock | Houston | -19 | |
| Sep 7, 2026Arrived | Newark | Buffalo | -37 | |
| Sep 6, 2026Arrived | Newark | Buffalo | -29 | |
| Sep 5, 2026Arrived | Newark | Buffalo | -33 | |
| Sep 4, 2026Arrived | Newark | Buffalo | -1 | |
| Sep 2, 2026Cancelled | Newark | Buffalo | Not available | Not available |
| Sep 1, 2026Cancelled | Newark | Buffalo | Not available | Not available |
| Aug 28, 2026Arrived | Newark | Buffalo | -29 | |
| Aug 27, 2026Cancelled | Newark | Buffalo | Not available | Not available |