Route on-time record

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

Las Vegas (Harry Reid International Airport) to San Antonio (San Antonio International Airport). 2,080 nonstop flights in Jun 2025 to May 2026, 76% arrived within 15 minutes and 0.3% were cancelled. The most reliable flight number was Southwest 3087 at 7:10 AM.

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

LAS → SAT

Las Vegas to San Antonio: 2,080 nonstop flights a year

On time (12 months)

76%

Cancelled

0.3%

avg delay 15 min

Best time to leave

Before 9 AM

94% on time vs 62% 3 to 6 PM

Most reliable airline

Frontier

84% chance on time

Check LAS to SAT fares

Lowest nonstop fare seen in the next two months: $207 (Frontier 3420 on 2026-10-24). 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 3087
7:10 AM → 11:45 AM2h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31.
93%
chance on time
On time (history)
96%
Cancelled
0.0%
Avg arrival delay
2 min
- Arrived on time 96% 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: 94% on time; 3 to 6 PM: 62%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Limited track record · 55 flights
Find Southwest 3087 fares Opens this date on Aviasales
#2 · Southwest 3747
6:40 AM → 11:10 AM2h 30m nonstop
Local times, typical schedule. Last flown 2026-04-06.
87%
chance on time
On time (history)
85%
Cancelled
0.0%
Avg arrival delay
6 min
- Arrived on time 85% of the time (33 flights, Jun 2025 to May 2026).
- Never cancelled in 33 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; 3 to 6 PM: 62%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Limited track record · 33 flights
Find Southwest 3747 fares Opens this date on Aviasales
#3 · Frontier 3418
3:24 PM → 8:14 PM2h 43m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
On time (history)
89%
Cancelled
0.4%
Avg arrival delay
7 min
- Arrived on time 89% of the time (222 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 62% on time; Before 9 AM: 94%).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
Strong track record · 222 flights
Find Frontier 3418 fares Opens this date on Aviasales
#4 · Southwest 3383
11:05 AM → 3:45 PM2h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
On time (history)
88%
Cancelled
0.0%
Avg arrival delay
3 min
- Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 3383 fares Opens this date on Aviasales
#5 · Southwest 3654
2:20 PM → 7:00 PM2h 40m nonstop
Local times, typical schedule. Last flown 2026-04-06.
74%
chance on time
On time (history)
80%
Cancelled
0.0%
Avg arrival delay
11 min
- Arrived on time 80% of the time (15 flights, Jun 2025 to May 2026).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- 57% 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 3654 fares Opens this date on Aviasales
#6 · Southwest 2751
9:30 AM → 2:05 PM2h 35m nonstop
Local times, typical schedule. Last flown 2026-05-29. Same departure also flew as Southwest 947; its record covers all of them.
72%
chance on time
On time (history)
63%
Cancelled
0.0%
Avg arrival delay
14 min
- Arrived on time 63% of the time (67 flights, Jun 2025 to May 2026).
- Never cancelled in 67 scheduled flights.
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Moderate track record · 67 flights
Find Southwest 2751 fares Opens this date on Aviasales
#7 · Southwest 3055
2:35 PM → 7:10 PM2h 35m nonstop
Local times, typical schedule. Last flown 2026-04-01.
71%
chance on time
On time (history)
75%
Cancelled
0.0%
Avg arrival delay
8 min
- Arrived on time 75% of the time (8 flights, Jun 2025 to May 2026).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 3055 fares Opens this date on Aviasales
#8 · Southwest 4272
1:35 PM → 6:10 PM2h 35m nonstop
Local times, typical schedule. Last flown 2026-05-29.
71%
chance on time
On time (history)
61%
Cancelled
0.0%
Avg arrival delay
33 min
- Arrived on time 61% of the time (23 flights, Jun 2025 to May 2026).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 4272 fares Opens this date on Aviasales
#9 · Southwest 2770
6:55 PM → 11:30 PM2h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31.
68%
chance on time
On time (history)
61%
Cancelled
0.0%
Avg arrival delay
22 min
- Arrived on time 61% of the time (23 flights, Jun 2025 to May 2026).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 2770 fares Opens this date on Aviasales
#10 · Southwest 249
12:40 PM → 5:20 PM2h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31.
68%
chance on time
On time (history)
50%
Cancelled
0.0%
Avg arrival delay
16 min
- Arrived on time 50% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find Southwest 249 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

Frontier Airlines84%
258 flights · 87% on time as flown · 0.4% cancel
Spirit Airlines80%
248 flights · 83% on time as flown · 0.4% cancel
Southwest Airlines74%
1,574 flights · 74% on time as flown · 0.3% cancel

On time by departure time

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

Before 9 AM94%
544 flights · avg delay 4 min
9 AM to noon82%
401 flights · avg delay 8 min
Noon to 3 PM74%
326 flights · avg delay 15 min
3 to 6 PM62%
410 flights · avg delay 22 min
6 to 9 PM62%
287 flights · avg delay 27 min
After 9 PM67%
112 flights · avg delay 25 min

Best day: Wednesday (84%). Worst: Friday (73%).

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 aircraft51%
Airline (crew, maintenance, boarding)34%
Air traffic control and airport volume15%

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

LAS to SAT questions

What time of day is best to fly LAS to SAT?: Before 9 AM: 94% of flights arrived on time, against 62% for departures 3 to 6 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 LAS to SAT?: Frontier, with a season-adjusted 84% chance of operating and arriving on time over 258 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 LAS to SAT?: July (66% on time); the best was November (86%), 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.

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