About 1 in 5 DL 2666 flights from Salt Lake City arrived 15+ minutes late, diverted or cancelled over the past year (21%); 0.6% were cancelled. The typical flight landed 6 minutes early.
DL 2666: SLC → STL
Scheduled to leave Salt Lake City at 8:50 p.m. local time. Over the past year it arrived on time 79% of the time (354 flights), in line with other DL flights on the route at that hour (78%). Last seen in the data Aug 30, 2026.
Usually Delta Air Lines's last flight of the day from Salt Lake City to St. Louis (100% of days). Delta Air Lines's last SLC–STL flight was cancelled 0.5% of the time, against 0.7% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 9:41 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 52 | 85% |
| Tuesday | 52 | 81% |
| Wednesday | 52 | 88% |
| Thursday | 52 | 75% |
| Friday | 51 | 78% |
| Saturday | 43 | 81% |
| Sunday | 52 | 67% |
Why it was late
All flights SLC → STL · Connecting off DL 2666? Check the risk
Questions
How often is DL 2666 from SLC to STL late?
Delta Air Lines 2666 from Salt Lake City, UT to St. Louis, MO arrived 15 or more minutes late, was diverted or was cancelled on 21% of 354 scheduled flights between September 2025 and August 2026. 0.6% 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.