Flight Reliability
DL 2817 · Delta Air Lines
Salt Lake City → Seattle (SLC–SEA)
81
Pretty Reliable
WanderNerd Reliability Score
- 75%
- Arrive within 15 minutes
- 5 min
- Average arrival delay
- 0.6%
- Cancelled
- 5 min early
- Median arrival delay
Based on 363 historical flights. Data through May 2026.
What the data says
Friday is doing you no favors.
DL 2817 arrived on time 83% of the time on Saturdays and just 66% on Fridays. That gap is worth planning around.
A bit behind the SLC–SEA route.
DL 2817 arrived on time 75% of the time, versus 80% across the SLC–SEA route.
A bit behind the Delta Air Lines network.
DL 2817 arrived on time 75% of the time, versus 81% across the Delta Air Lines network.
Ticking up lately.
DL 2817 arrived on time 83% of the time over the last three months in the data, compared with 78% in the three months before that.
The breakdown
- Mon75%(51 flights)
- Tue79%(52 flights)
- Wed73%(52 flights)
- Thu77%(51 flights)
- Fri66%(50 flights)
- Sat83%(52 flights)
- Sun76%(53 flights)
74%
May
Jun 69% → May 74% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 69% | 29 |
| July 2025 | 77% | 31 |
| August 2025 | 65% | 31 |
| September 2025 | 60% | 30 |
| October 2025 | 68% | 31 |
| November 2025 | 86% | 28 |
| December 2025 | 58% | 31 |
| January 2026 | 94% | 31 |
| February 2026 | 82% | 28 |
| March 2026 | 90% | 30 |
| April 2026 | 83% | 30 |
| May 2026 | 74% | 31 |
- Departures on time
- 81%
- Diverted
- 0%
- Flights flown
- 361
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 363 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.