Flight Reliability
DL 439 · Delta Air Lines
Dallas–Fort Worth → Los Angeles (DFW–LAX)
89
Pretty Reliable
WanderNerd Reliability Score
- 93%
- Arrive within 15 minutes
- 4 min early
- Average arrival delay
- 3.0%
- Cancelled
- 8 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Skip Monday if you can.
DL 439 arrived on time 100% of the time on Thursdays. On Mondays: 88%.
Well ahead of the DFW–LAX route.
DL 439 arrived on time 93% of the time, versus 73% across the DFW–LAX route.
Better than the Delta Air Lines network average.
DL 439 arrived on time 93% of the time, versus 81% across the Delta Air Lines network.
Keep a backup plan handy.
DL 439 was cancelled 3.0% of the time. Typical for U.S. flights is around 1–2%.
The breakdown
- Mon88%(51 flights)
- Tue89%(52 flights)
- Wed96%(50 flights)
- Thu100%(51 flights)
- Fri90%(51 flights)
- Sat92%(47 flights)
- Sun96%(52 flights)
90%
May
Jun 93% → May 90% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 93% | 30 |
| July 2025 | 90% | 30 |
| August 2025 | 94% | 31 |
| September 2025 | 90% | 30 |
| October 2025 | 97% | 31 |
| November 2025 | 96% | 27 |
| December 2025 | 90% | 31 |
| January 2026 | 89% | 26 |
| February 2026 | 96% | 28 |
| March 2026 | 97% | 30 |
| April 2026 | 93% | 29 |
| May 2026 | 90% | 31 |
- Departures on time
- 94%
- Diverted
- 0%
- Flights flown
- 354
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 365 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.