Route on-time record

DEN to SAT: most on-time flights and the best time to fly

Denver (Denver International Airport) to San Antonio (San Antonio International Airport). 3,015 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 0.3% were cancelled. The most reliable flight number was United 2625 at 9:44 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

DEN → SAT

Denver to San Antonio: 3,015 nonstop flights a year

On time (12 months)

77%

Cancelled

0.3%

avg delay 15 min

Best time to leave

Before 9 AM

90% on time vs 57% 6 to 9 PM

Most reliable airline

United

81% chance on time

Check DEN to SAT fares

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 · United 2625
9:44 AM → 1:00 PM2h 16m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
On time (history)
92%
Cancelled
0.0%
Avg arrival delay
7 min
- Arrived on time 92% of the time (165 flights, Jun 2025 to May 2026).
- Never cancelled in 165 scheduled flights.
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Moderate track record · 165 flights
Find United 2625 fares Opens this date on Aviasales
#2 · United 1022
1:40 PM → 4:57 PM2h 16m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
On time (history)
88%
Cancelled
0.0%
Avg arrival delay
6 min
- Arrived on time 88% of the time (301 flights, Jun 2025 to May 2026).
- Never cancelled in 302 scheduled flights.
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Strong track record · 301 flights
Find United 1022 fares Opens this date on Aviasales
#3 · Southwest 2591
8:30 AM → 11:40 AM2h 10m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1015, 1866, 3570; its record covers all of them.
85%
chance on time
On time (history)
88%
Cancelled
0.0%
Avg arrival delay
5 min
- Arrived on time 88% of the time (88 flights, Jun 2025 to May 2026).
- Never cancelled in 88 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 57%).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Moderate track record · 88 flights
Find Southwest 2591 fares Opens this date on Aviasales
#4 · Frontier 2098
5:45 AM → 9:06 AM2h 21m nonstop
Local times, typical schedule. Last flown 2026-03-30.
79%
chance on time
On time (history)
78%
Cancelled
0.0%
Avg arrival delay
16 min
- Arrived on time 78% of the time (135 flights, Jun 2025 to May 2026).
- Never cancelled in 136 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 57%).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Moderate track record · 135 flights
Find Frontier 2098 fares Opens this date on Aviasales
#5 · Southwest 2059
12:40 PM → 3:50 PM2h 10m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
On time (history)
85%
Cancelled
0.0%
Avg arrival delay
7 min
- Arrived on time 85% of the time (54 flights, Jun 2025 to May 2026).
- Never cancelled in 54 scheduled flights.
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- Short track record (54 flights), so its score leans on the airline's record at this hour.
Limited track record · 54 flights
Find Southwest 2059 fares Opens this date on Aviasales
#6 · Southwest 859
1:40 PM → 4:50 PM2h 10m nonstop
Local times, typical schedule. Last flown 2026-04-06.
79%
chance on time
On time (history)
73%
Cancelled
0.0%
Avg arrival delay
21 min
- Arrived on time 73% of the time (15 flights, Jun 2025 to May 2026).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- 65% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (15 flights), so its score leans on the airline's record at this hour.
Limited track record · 15 flights
Find Southwest 859 fares Opens this date on Aviasales
#7 · Southwest 2058
10:55 AM → 2:05 PM2h 10m nonstop
Local times, typical schedule. Last flown 2026-05-29.
78%
chance on time
On time (history)
86%
Cancelled
4.3%
Avg arrival delay
7 min
- Arrived on time 86% of the time (22 flights, Jun 2025 to May 2026).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- Short track record (22 flights), so its score leans on the airline's record at this hour.
Limited track record · 22 flights
Find Southwest 2058 fares Opens this date on Aviasales
#8 · Frontier 2356
3:42 PM → 6:59 PM2h 17m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
On time (history)
83%
Cancelled
0.0%
Avg arrival delay
9 min
- Arrived on time 83% of the time (121 flights, Jun 2025 to May 2026).
- Never cancelled in 121 scheduled flights.
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 121 flights
Find Frontier 2356 fares Opens this date on Aviasales
#9 · Frontier 3708
9:00 PM → 12:17 AM2h 18m nonstop
Local times, typical schedule. Last flown 2026-05-04.
74%
chance on time
On time (history)
78%
Cancelled
1.0%
Avg arrival delay
14 min
- Arrived on time 78% of the time (99 flights, Jun 2025 to May 2026).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Moderate track record · 99 flights
Find Frontier 3708 fares Opens this date on Aviasales
#10 · Southwest 4132
12:20 PM → 3:30 PM2h 10m nonstop
Local times, typical schedule. Last flown 2026-04-06.
73%
chance on time
On time (history)
67%
Cancelled
0.0%
Avg arrival delay
30 min
- Arrived on time 67% of the time (15 flights, Jun 2025 to May 2026).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- 51% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (15 flights), so its score leans on the airline's record at this hour.
Limited track record · 15 flights
Find Southwest 4132 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

United Airlines81%
1,206 flights · 81% on time as flown · 0.3% cancel
Frontier Airlines78%
357 flights · 79% on time as flown · 0.3% cancel
Southwest Airlines72%
1,434 flights · 72% on time as flown · 0.3% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

Before 9 AM90%
327 flights · avg delay 5 min
9 AM to noon87%
634 flights · avg delay 8 min
Noon to 3 PM84%
682 flights · avg delay 9 min
3 to 6 PM69%
784 flights · avg delay 19 min
6 to 9 PM57%
465 flights · avg delay 30 min
After 9 PM66%
123 flights · avg delay 20 min

Best day: Wednesday (80%). Worst: Thursday (74%).

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

Late-arriving aircraft58%
Airline (crew, maintenance, boarding)28%
Air traffic control and airport volume12%
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

DEN to SAT questions

What time of day is best to fly DEN to SAT?: Before 9 AM: 90% of flights arrived on time, against 57% 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 DEN to SAT?: United, with a season-adjusted 81% chance of operating and arriving on time over 1,206 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 DEN to SAT?: July (64% on time); the best was November (84%), 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 DEN

Live status: FAA delays and ground stops

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