Flight Reliability
DL 339 · Delta Air Lines
Salt Lake City → Burbank (SLC–BUR)89% of its flights flew this route. The rest (TPA–LAX, ATL–PHX) are included in these numbers.
- 84%
- Arrive within 15 minutes
- 11 min
- Average arrival delay
- 0%
- Cancelled
- 6 min early
- Median arrival delay
Based on 349 historical flights. Data through May 2026.
What the data says
The late departure is the smart one here.
DL 339 departing between 9 PM–12 AM arrived on time 100% of the time, versus 83% between 6–9 PM.
Thursdays have been rough.
DL 339 arrived on time 94% of the time on Saturdays and just 74% on Thursdays. That gap is worth planning around.
It basically never cancels.
Out of 349 scheduled flights, only 0.0% were cancelled.
Ticking up lately.
DL 339 arrived on time 89% of the time over the last three months in the data, compared with 84% in the three months before that.
The breakdown
- Mon92%(47 flights)
- Tue81%(47 flights)
- Wed89%(52 flights)
- Thu74%(50 flights)
- Fri81%(52 flights)
- Sat94%(48 flights)
- Sun77%(52 flights)
- 6–9 PM83%(332 flights)
- 9 PM–12 AM100%(16 flights)
Jun 73% → May 93% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 73% | 30 |
| July 2025 | 70% | 30 |
| August 2025 | 81% | 31 |
| September 2025 | 93% | 30 |
| October 2025 | 83% | 23 |
| November 2025 | 85% | 26 |
| December 2025 | 87% | 31 |
| January 2026 | 90% | 31 |
| February 2026 | 75% | 28 |
| March 2026 | 84% | 31 |
| April 2026 | 89% | 27 |
| May 2026 | 93% | 30 |
- Departures on time
- 79%
- Diverted
- 0.3%
- Flights flown
- 348
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 349 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.