Flight UA1240
United Airlines flight UA1240
Looking for UA1240 in the airâŚ
Alerts at this flight's airports
Dallas-Fort Worth (DFW) to Dulles (IAD)
Historically, this flight arrives 15+ minutes late 23% of the time, and when it is late the delay averages 80 minutes. It was cancelled 1.2% of the time.
- On-time arrivals
- 77.5%
- Less than 15 minutes late
- Cancelled
- 1.2%
- Of scheduled flights
- Average delay when late
- 80 min
- Flights arriving 15+ minutes late
- Flights tracked
- 328
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 47%
- Airline (crew, maintenance, cleaning) 26%
- Air traffic control & airport 24%
- Extreme weather 3%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Chicago (ORD) to Kalispell (FCA)
Only 19 flights on record, which is too few for reliable odds.
- On-time arrivals
- 57.9%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 52 min
- Flights arriving 15+ minutes late
- Flights tracked
- 19
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 42%
- Late-arriving aircraft 31%
- Airline (crew, maintenance, cleaning) 28%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Francisco (SFO) to Newark (EWR)
Only 1 flight on record, which is too few for reliable odds.
- On-time arrivals
- 100.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- â
- Flights arriving 15+ minutes late
- Flights tracked
- 1
- Scheduled flights in the period
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Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 90.0% | 30 |
| October 2025 | 76.7% | 30 |
| November 2025 | 73.1% | 26 |
| December 2025 | 65.5% | 29 |
| January 2026 | 90.9% | 24 |
| February 2026 | 96.0% | 25 |
| March 2026 | 74.2% | 31 |
| April 2026 | 86.7% | 30 |
| May 2026 | 70.0% | 31 |
| June 2026 | 70.0% | 30 |
| July 2026 | 51.6% | 31 |
| August 2026 | 80.0% | 31 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 â August 2026. Covers flights operated by reporting U.S. carriers. About our data