San Antonio (SAT) to Denver (DEN): On-Time Performance
Data through July 2026
The calendar drives reliability on SAT–DEN. September 2024 flights landed on schedule 92% of the time, but June 2026 dropped to 69% — a gap of 23 points. Across the full period the route averages 82% on-time against a national 78%. Morning departures also hold up better than evening ones (90% vs 66%), which matters most in the rough months.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 0.5%
- Flights/day
- 8.3
- last 12 months
- Duration
- 2h 21m
- scheduled
- Distance
- 794 mi
Best airline from SAT to DEN
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 83% | 15 min | 0.6% | 2,648 |
| Southwest Airlines | 82% | 11 min | 0.3% | 3,038 |
| Frontier Airlines | 76% | 20 min | 1.0% | 677 |
Monthly on-time trend
Best time to fly from SAT to DEN
Aim for departures around 5 a.m. (96% on-time); avoid 6 p.m. departures (63%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 83% | 14 min |
| Tuesday | 81% | 14 min |
| Wednesday | 82% | 14 min |
| Thursday | 82% | 13 min |
| Friday | 80% | 16 min |
| Saturdaybest | 83% | 13 min |
| Sunday | 82% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft41%
- Airline operations27%
- National airspace system30%
- Weather2%
Frequently asked questions
- How often are flights from SAT to DEN delayed?
- 18% of SAT–DEN flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 14 minutes.
- Which airline is most reliable from SAT to DEN?
- United Airlines has the best on-time record on this route at 83%, based on 2,648 flights. 3 airlines flew SAT–DEN frequently enough to compare in this period.
- What is the best time of day to fly from SAT to DEN?
- Departures around 5 a.m. have the best record (96% on-time), while departures around 6 p.m. have the worst (63%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SAT to DEN?
- The scheduled SAT–DEN flight time averages 2h 21m over 794 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are SAT to DEN flights cancelled?
- 0.5% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from SAT to DEN?
- June 2026 was the roughest month in this dataset, with only 69% of arrivals on time. The best was September 2024 at 92%. If your dates are flexible, that 23-point gap is worth planning around.
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Based on 6,413 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.