Flight Reliability
UA 640 · United Airlines
Denver → Dallas–Fort Worth (DEN–DFW)
39
Bring Snacks
WanderNerd Reliability Score
- 59%
- Arrive within 15 minutes
- 27 min
- Average arrival delay
- 1.2%
- Cancelled
- 0 min
- Median arrival delay
Based on 82 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
UA 640 arrived on time 80% of the time on Wednesdays and just 27% on Sundays. That gap is worth planning around.
Well behind the DEN–DFW route.
UA 640 arrived on time 59% of the time, versus 76% across the DEN–DFW route.
Well behind the United Airlines network.
UA 640 arrived on time 59% of the time, versus 79% across the United Airlines network.
The breakdown
- Mon65%(17 flights)
- Tue—(0 flights)
- Wed80%(15 flights)
- Thu56%(16 flights)
- Fri67%(15 flights)
- Sat—(0 flights)
- Sun27%(15 flights)
73%
Sep
Jun 64% → Sep 73% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 64% | 22 |
| July 2025 | 43% | 21 |
| August 2025 | 60% | 20 |
| September 2025 | 73% | 15 |
- Departures on time
- 70%
- Diverted
- 3.7%
- Flights flown
- 78
- Months covered
- 4
Same route, other flights
Keep nerding
Based on 82 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.