About 1 in 18 DL 4038 flights from Salt Lake City arrived 15+ minutes late, diverted or cancelled over the past year (5%); 0.4% were cancelled. The typical flight landed 10 minutes early.
DL 4038: SLC → BIL
Scheduled to leave Salt Lake City at 9:25 a.m. local time, operated by SkyWest as OO 4038. Over the past year it arrived on time 95% of the time (255 flights), in line with other DL flights on the route at that hour (94%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 37 | 97% |
| Tuesday | 36 | 92% |
| Wednesday | 36 | 100% |
| Thursday | 36 | 97% |
| Friday | 36 | 89% |
| Saturday | 37 | 89% |
| Sunday | 37 | 97% |
Why it was late
All flights SLC → BIL · Connecting off DL 4038? Check the risk
DL 4038: BIL → SLC
Scheduled to leave Billings at 11:34 a.m. local time, operated by SkyWest as OO 4038. Over the past year it arrived on time 93% of the time (255 flights), in line with other DL flights on the route at that hour (94%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 37 | 97% |
| Tuesday | 36 | 89% |
| Wednesday | 36 | 94% |
| Thursday | 36 | 94% |
| Friday | 36 | 97% |
| Saturday | 37 | 84% |
| Sunday | 37 | 97% |
Why it was late
All flights BIL → SLC · Connecting off DL 4038? Check the risk
Questions
How often is DL 4038 from SLC to BIL late?
Delta Air Lines 4038 from Salt Lake City, UT to Billings, MT arrived 15 or more minutes late, was diverted or was cancelled on 5% of 255 scheduled flights between September 2025 and August 2026. 0.4% were cancelled.
How often is DL 4038 from BIL to SLC late?
Delta Air Lines 4038 from Billings, MT to Salt Lake City, UT arrived 15 or more minutes late, was diverted or was cancelled on 7% of 255 scheduled flights between September 2025 and August 2026. 0.4% 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.