About 1 in 21 DL 3839 flights from Salt Lake City arrived 15+ minutes late, diverted or cancelled over the past year (5%); 0.0% were cancelled. The typical flight landed 15 minutes early.
DL 3839: SLC → HLN
Scheduled to leave Salt Lake City at 9:05 p.m. local time, operated by SkyWest as OO 3839. 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 (95%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Salt Lake City to Helena (98% of days). Delta Air Lines's last SLC–HLN flight was cancelled 0.0% of the time, against 0.6% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 10:45 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 37 | 100% |
| Tuesday | 36 | 97% |
| Wednesday | 36 | 97% |
| Thursday | 36 | 83% |
| Friday | 36 | 97% |
| Saturday | 37 | 95% |
| Sunday | 37 | 97% |
Why it was late
All flights SLC → HLN · Connecting off DL 3839? Check the risk
Questions
How often is DL 3839 from SLC to HLN late?
Delta Air Lines 3839 from Salt Lake City, UT to Helena, MT arrived 15 or more minutes late, was diverted or was cancelled on 5% of 255 scheduled flights between September 2025 and August 2026. 0.0% 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.