About 1 in 11 DL 3859 flights from Great Falls arrived 15+ minutes late, diverted or cancelled over the past year (9%); 1.4% were cancelled. The typical flight landed 14 minutes early.
DL 3859: GTF → SLC
Scheduled to leave Great Falls at 1:12 p.m. local time, operated by SkyWest as OO 3859. Over the past year it arrived on time 91% of the time (364 flights), in line with other DL flights on the route at that hour (90%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 91% |
| Tuesday | 52 | 98% |
| Wednesday | 52 | 94% |
| Thursday | 51 | 86% |
| Friday | 52 | 92% |
| Saturday | 52 | 85% |
| Sunday | 52 | 88% |
Why it was late
All flights GTF → SLC · Connecting off DL 3859? Check the risk
DL 3859: SLC → GTF
Scheduled to leave Salt Lake City at 10:45 a.m. local time, operated by SkyWest as OO 3859. Over the past year it arrived on time 94% of the time (364 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 | 53 | 92% |
| Tuesday | 52 | 96% |
| Wednesday | 52 | 98% |
| Thursday | 51 | 88% |
| Friday | 52 | 90% |
| Saturday | 52 | 94% |
| Sunday | 52 | 96% |
Why it was late
All flights SLC → GTF · Connecting off DL 3859? Check the risk
Questions
How often is DL 3859 from GTF to SLC late?
Delta Air Lines 3859 from Great Falls, MT to Salt Lake City, UT arrived 15 or more minutes late, was diverted or was cancelled on 9% of 364 scheduled flights between September 2025 and August 2026. 1.4% were cancelled.
How often is DL 3859 from SLC to GTF late?
Delta Air Lines 3859 from Salt Lake City, UT to Great Falls, MT arrived 15 or more minutes late, was diverted or was cancelled on 6% of 364 scheduled flights between September 2025 and August 2026. 1.4% 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.