Flight Reliability
DL 1340 · Delta Air Lines
Salt Lake City → BIL (SLC–BIL)
89
Pretty Reliable
WanderNerd Reliability Score
- 82%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 0.3%
- Cancelled
- 8 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Mondays have been rough.
DL 1340 arrived on time 89% of the time on Tuesdays and just 73% on Mondays. That gap is worth planning around.
A bit behind the SLC–BIL route.
DL 1340 arrived on time 82% of the time, versus 89% across the SLC–BIL route.
It basically never cancels.
Out of 365 scheduled flights, only 0.3% were cancelled.
Ticking up lately.
DL 1340 arrived on time 85% of the time over the last three months in the data, compared with 81% in the three months before that.
The breakdown
- Mon73%(52 flights)
- Tue89%(52 flights)
- Wed81%(52 flights)
- Thu83%(52 flights)
- Fri88%(51 flights)
- Sat89%(52 flights)
- Sun76%(53 flights)
- 3–6 PM—(1 flights)
- 9 PM–12 AM82%(363 flights)
87%
May
Jun 70% → May 87% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 70% | 30 |
| July 2025 | 77% | 30 |
| August 2025 | 84% | 31 |
| September 2025 | 90% | 30 |
| October 2025 | 77% | 31 |
| November 2025 | 93% | 30 |
| December 2025 | 81% | 31 |
| January 2026 | 84% | 31 |
| February 2026 | 79% | 28 |
| March 2026 | 90% | 31 |
| April 2026 | 77% | 30 |
| May 2026 | 87% | 31 |
- Departures on time
- 79%
- Diverted
- 0%
- Flights flown
- 364
- 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.