Route on-time record
SAT to LAS: most on-time flights and the best time to fly
San Antonio (San Antonio International Airport) to Las Vegas (Harry Reid International Airport). 2,079 nonstop flights in Jun 2025 to May 2026, 83% arrived within 15 minutes and 0.5% were cancelled. The most reliable flight number was Southwest 2556 at 6:55 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SAT → LAS
San Antonio to Las Vegas: 2,079 nonstop flights a year
On time (12 months)
83%
Cancelled
0.5%
avg delay 11 min
Best time to leave
Before 9 AM
96% on time vs 67% after 9 PM
Most reliable airline
Spirit
83% 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 2556
6:55 AM → 7:45 AM2h 50m nonstop
Local times, typical schedule. Last flown 2026-05-29.
94%
chance on time
- On time (history)
- 95%
- Cancelled
- 0.0%
- Avg arrival delay
- 1 min
- Arrived on time 95% of the time (39 flights, Jun 2025 to May 2026).
- Never cancelled in 39 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 96% on time; After 9 PM: 67%).
- Short track record (39 flights), so its score leans on the airline's record at this hour.
Limited track record · 39 flights
Find Southwest 2556 fares Opens this date on Aviasales#2 · Southwest 859
5:40 AM → 6:30 AM2h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
93%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 1 min
- Arrived on time 100% of the time (16 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 96% on time; After 9 PM: 67%).
- Short track record (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find Southwest 859 fares Opens this date on Aviasales#3 · Southwest 1724
5:50 AM → 6:50 AM3h 00m nonstop
Local times, typical schedule. Last flown 2026-04-06.
92%
chance on time
- On time (history)
- 97%
- Cancelled
- 3.1%
- Avg arrival delay
- 1 min
- Arrived on time 97% of the time (31 flights, Jun 2025 to May 2026).
- Cancelled 3.1% of the time (1 of 32).
- Leaves in this route's most on-time window (Before 9 AM: 96% on time; After 9 PM: 67%).
- Short track record (31 flights), so its score leans on the airline's record at this hour.
Limited track record · 31 flights
Find Southwest 1724 fares Opens this date on Aviasales#4 · Southwest 3244
8:55 AM → 9:45 AM2h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
91%
chance on time
- On time (history)
- 100%
- Cancelled
- 4.3%
- Avg arrival delay
- 2 min
- Arrived on time 100% of the time (22 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 96% on time; After 9 PM: 67%).
- Short track record (22 flights), so its score leans on the airline's record at this hour.
Limited track record · 22 flights
Find Southwest 3244 fares Opens this date on Aviasales#5 · Southwest 676
9:55 AM → 10:55 AM3h 00m nonstop
Local times, typical schedule. Last flown 2026-04-05.
90%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (13 flights, Jun 2025 to May 2026).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (13 flights), so its score leans on the airline's record at this hour.
Limited track record · 13 flights
Find Southwest 676 fares Opens this date on Aviasales#6 · Southwest 1833
7:50 AM → 8:50 AM3h 00m nonstop
Local times, typical schedule. Last flown 2026-04-06.
88%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 93% of the time (15 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 96% on time; After 9 PM: 67%).
- 93% 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 1833 fares Opens this date on Aviasales#7 · Southwest 467
11:55 AM → 12:55 PM3h 00m nonstop
Local times, typical schedule. Last flown 2026-04-06.
87%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 89% of the time (28 flights, Jun 2025 to May 2026).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (28 flights), so its score leans on the airline's record at this hour.
Limited track record · 28 flights
Find Southwest 467 fares Opens this date on Aviasales#8 · Southwest 1625
12:25 PM → 1:15 PM2h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
82%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 76% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (55 flights), so its score leans on the airline's record at this hour.
Limited track record · 55 flights
Find Southwest 1625 fares Opens this date on Aviasales#9 · Frontier 3417
8:59 PM → 12:41 PM3h 03m nonstop
Local times, typical schedule. Last flown 2026-05-31.
81%
chance on time
- On time (history)
- 84%
- Cancelled
- 1.4%
- Avg arrival delay
- 10 min
- Arrived on time 84% of the time (216 flights, Jun 2025 to May 2026).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
Strong track record · 216 flights
Find Frontier 3417 fares Opens this date on Aviasales#10 · Southwest 3183
3:00 PM → 3:50 PM2h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
- On time (history)
- 65%
- Cancelled
- 4.2%
- Avg arrival delay
- 18 min
- Arrived on time 65% of the time (23 flights, Jun 2025 to May 2026).
- Lands 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 3183 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Spirit Airlines83%
246 flights · 85% on time as flown · 0.7% cancel
- Southwest Airlines83%
1,574 flights · 83% on time as flown · 0.3% cancel
- Frontier Airlines82%
259 flights · 82% on time as flown · 0.9% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM96%
454 flights · avg delay 4 min
- 9 AM to noon92%
307 flights · avg delay 5 min
- Noon to 3 PM81%
482 flights · avg delay 11 min
- 3 to 6 PM78%
348 flights · avg delay 14 min
- 6 to 9 PM72%
333 flights · avg delay 17 min
- After 9 PM67%
155 flights · avg delay 24 min
Best day: Wednesday (88%). Worst: Friday (75%).
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 aircraft48%
- Air traffic control and airport volume26%
- Airline (crew, maintenance, boarding)23%
- Severe weather3%
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 LAS questions
- What time of day is best to fly SAT to LAS?
- Before 9 AM: 96% of flights arrived on time, against 67% for departures after 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 LAS?
- Spirit, with a season-adjusted 83% chance of operating and arriving on time over 246 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 LAS?
- July (75% 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
- LAS to SAT (return)
- SAT to DFW 77%
- SAT to ATL 85%
- SAT to DEN 81%
- SAT to DAL 84%
- SAT to PHX 83%
- SAT to IAH 81%
- 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