About 1 in 17 DL 3985 flights from Salt Lake City arrived 15+ minutes late, diverted or cancelled over the past year (6%); 0.8% were cancelled. The typical flight landed 15 minutes early.
DL 3985: SLC → SUN
Scheduled to leave Salt Lake City at 8:45 p.m. local time, operated by SkyWest as OO 3985. Over the past year it arrived on time 94% of the time (253 flights), in line with other DL flights on the route at that hour (94%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Salt Lake City to Sun Valley (100% of days). Delta Air Lines's last SLC–SUN flight was cancelled 0.8% of the time, against 0.7% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 11:15 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 37 | 95% |
| Tuesday | 35 | 91% |
| Wednesday | 35 | 94% |
| Thursday | 36 | 92% |
| Friday | 36 | 100% |
| Saturday | 37 | 92% |
| Sunday | 37 | 95% |
Why it was late
All flights SLC → SUN · Connecting off DL 3985? Check the risk
Questions
How often is DL 3985 from SLC to SUN late?
Delta Air Lines 3985 from Salt Lake City, UT to Sun Valley/Hailey/Ketchum, ID arrived 15 or more minutes late, was diverted or was cancelled on 6% of 253 scheduled flights between September 2025 and August 2026. 0.8% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Delta Air Lines for today's flight. Method.