About 1 in 36 DL 4037 flights from Sun Valley arrived 15+ minutes late, diverted or cancelled over the past year (3%); 0.8% were cancelled. The typical flight landed 19 minutes early.
DL 4037: SUN → SLC
Scheduled to leave Sun Valley at 7:30 a.m. local time, operated by SkyWest as OO 4037. Over the past year it arrived on time 97% of the time (363 flights), in line with other DL flights on the route at that hour (97%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 96% |
| Tuesday | 52 | 96% |
| Wednesday | 51 | 96% |
| Thursday | 51 | 96% |
| Friday | 52 | 98% |
| Saturday | 52 | 98% |
| Sunday | 52 | 100% |
Why it was late
All flights SUN → SLC · Connecting off DL 4037? Check the risk
Questions
How often is DL 4037 from SUN to SLC late?
Delta Air Lines 4037 from Sun Valley/Hailey/Ketchum, ID to Salt Lake City, UT arrived 15 or more minutes late, was diverted or was cancelled on 3% of 363 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.