Route on-time record
SAT to DEN: most on-time flights and the best time to fly
San Antonio (San Antonio International Airport) to Denver (Denver International Airport). 3,013 nonstop flights in Jun 2025 to May 2026, 81% arrived within 15 minutes and 0.5% were cancelled. The most reliable flight number was Southwest 3195 at 6:30 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SAT → DEN
San Antonio to Denver: 3,013 nonstop flights a year
On time (12 months)
81%
Cancelled
0.5%
avg delay 15 min
Best time to leave
Before 9 AM
91% on time vs 65% 6 to 9 PM
Most reliable airline
Southwest
82% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Southwest 3195
6:30 AM → 7:45 AM2h 15m nonstop
Local times, typical schedule. Last flown 2026-04-06.
94%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 1 min
- Arrived on time 100% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 33 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 65%).
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find Southwest 3195 fares Opens this date on Aviasales#2 · United 1464
5:30 AM → 6:49 AM2h 19m nonstop
Local times, typical schedule. Last flown 2026-05-31.
94%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 1 min
- Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 65%).
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find United 1464 fares Opens this date on Aviasales#3 · United 2316
5:47 AM → 7:05 AM2h 18m nonstop
Local times, typical schedule. Last flown 2026-03-28.
93%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.0%
- Avg arrival delay
- 21 min
- Arrived on time 96% of the time (23 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 65%).
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find United 2316 fares Opens this date on Aviasales#4 · Southwest 3197
6:20 AM → 7:35 AM2h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31.
92%
chance on time
- On time (history)
- 95%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 95% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 65%).
- Short track record (55 flights), so its score leans on the airline's record at this hour.
Limited track record · 55 flights
Find Southwest 3197 fares Opens this date on Aviasales#5 · Southwest 1330
10:50 AM → 12:10 PM2h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 6 min
- Arrived on time 90% of the time (31 flights, Jun 2025 to May 2026).
- Never cancelled in 31 scheduled flights.
- Short track record (31 flights), so its score leans on the airline's record at this hour.
Limited track record · 31 flights
Find Southwest 1330 fares Opens this date on Aviasales#6 · United 1007
1:39 PM → 2:55 PM2h 16m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
- Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find United 1007 fares Opens this date on Aviasales#7 · Southwest 3586
12:55 PM → 2:15 PM2h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 89% of the time (53 flights, Jun 2025 to May 2026).
- Never cancelled in 54 scheduled flights.
- Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (53 flights), so its score leans on the airline's record at this hour.
Limited track record · 53 flights
Find Southwest 3586 fares Opens this date on Aviasales#8 · United 502
1:11 PM → 2:33 PM2h 22m nonstop
Local times, typical schedule. Last flown 2026-05-20.
85%
chance on time
- On time (history)
- 82%
- Cancelled
- 0.0%
- Avg arrival delay
- 15 min
- Arrived on time 82% of the time (17 flights, Jun 2025 to May 2026).
- Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (17 flights), so its score leans on the airline's record at this hour.
Limited track record · 17 flights
Find United 502 fares Opens this date on Aviasales#9 · United 1789
1:25 PM → 2:47 PM2h 22m nonstop
Local times, typical schedule. Last flown 2026-05-18. Same departure also flew as United 2112; its record covers all of them.
84%
chance on time
- On time (history)
- 86%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 86% of the time (120 flights, Jun 2025 to May 2026).
- Never cancelled in 120 scheduled flights.
- Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- 58% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 120 flights
Find United 1789 fares Opens this date on Aviasales#10 · Frontier 2355
6:45 AM → 8:08 AM2h 25m nonstop
Local times, typical schedule. Last flown 2026-05-20.
83%
chance on time
- On time (history)
- 85%
- Cancelled
- 1.3%
- Avg arrival delay
- 20 min
- Arrived on time 85% of the time (155 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 65%).
Moderate track record · 155 flights
Find Frontier 2355 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines82%
1,433 flights · 82% on time as flown · 0.4% cancel
- United Airlines81%
1,207 flights · 81% on time as flown · 0.5% cancel
- Frontier Airlines77%
355 flights · 78% on time as flown · 0.7% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM91%
870 flights · avg delay 12 min
- 9 AM to noon87%
446 flights · avg delay 8 min
- Noon to 3 PM85%
620 flights · avg delay 10 min
- 3 to 6 PM72%
581 flights · avg delay 22 min
- 6 to 9 PM65%
496 flights · avg delay 23 min
Best day: Wednesday (85%). Worst: Friday (80%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Air traffic control and airport volume34%
- Late-arriving aircraft34%
- Airline (crew, maintenance, boarding)30%
- Severe weather2%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
SAT to DEN questions
- What time of day is best to fly SAT to DEN?
- Before 9 AM: 91% of flights arrived on time, against 65% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from SAT to DEN?
- Southwest, with a season-adjusted 82% chance of operating and arriving on time over 1,433 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on SAT to DEN?
- June (72% on time); the best was November (89%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from SAT
- DEN to SAT (return)
- SAT to DFW 77%
- SAT to ATL 85%
- SAT to DAL 84%
- SAT to PHX 83%
- SAT to IAH 81%
- SAT to LAS 83%
- SAT to ORD 76%
- SAT to LAX 87%
- SAT to HOU 74%
- SAT to CLT 86%
- SAT to MCO 77%
- SAT to SLC 86%
Live status: FAA delays and ground stops