About 1 in 6 DL 3123 flights from Salt Lake City arrived 15+ minutes late, diverted or cancelled over the past year (17%); 0.8% were cancelled. The typical flight landed 7 minutes early.
DL 3123: SLC → SAT
Scheduled to leave Salt Lake City at 9:50 a.m. local time. Over the past year it arrived on time 83% of the time (250 flights), in line with other DL flights on the route at that hour (85%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 37 | 92% |
| Tuesday | 36 | 81% |
| Wednesday | 36 | 83% |
| Thursday | 36 | 81% |
| Friday | 36 | 86% |
| Saturday | 32 | 84% |
| Sunday | 37 | 76% |
Why it was late
All flights SLC → SAT · Connecting off DL 3123? Check the risk
Questions
How often is DL 3123 from SLC to SAT late?
Delta Air Lines 3123 from Salt Lake City, UT to San Antonio, TX arrived 15 or more minutes late, was diverted or was cancelled on 17% of 250 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.