Route on-time record
HOU to SAT: most on-time flights and the best time to fly
Houston (William P. Hobby Airport) to San Antonio (San Antonio International Airport). 1,408 nonstop flights in Jun 2025 to May 2026, 79% arrived within 15 minutes and 0.0% were cancelled. The most reliable flight number was Southwest 4157 at 8:15 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
HOU → SAT
Houston to San Antonio: 1,408 nonstop flights a year
On time (12 months)
79%
Cancelled
0.0%
avg delay 12 min
Best time to leave
Before 9 AM
95% on time vs 63% after 9 PM
Most reliable airline
Southwest
79% chance on time
Lowest nonstop fare seen in the next two months: $254 (Southwest 4470 on 2026-11-01). 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 4157
8:15 AM → 9:15 AM1h 00m nonstop
Local times, typical schedule. Last flown 2026-05-30.
89%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 6 min
- Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 95% on time; After 9 PM: 63%).
- Departs outside HOU's trouble window (noon to 6 PM, when 80% of its 40 ground stops and delay programs started).
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 4157 fares Opens this date on Aviasales#2 · Southwest 1682
10:55 AM → 12:00 PM1h 05m nonstop
Local times, typical schedule. Last flown 2026-05-27.
85%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 88% of the time (16 flights, Jun 2025 to May 2026).
- Departs outside HOU's trouble window (noon to 6 PM, when 80% of its 40 ground stops and delay programs started).
- Short track record (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find Southwest 1682 fares Opens this date on Aviasales#3 · Southwest 4677
10:15 AM → 11:15 AM1h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1851; its record covers all of them.
82%
chance on time
- On time (history)
- 75%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 75% of the time (36 flights, Jun 2025 to May 2026).
- Never cancelled in 36 scheduled flights.
- Departs outside HOU's trouble window (noon to 6 PM, when 80% of its 40 ground stops and delay programs started).
- 56% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 36 flights
Find Southwest 4677 fares Opens this date on Aviasales#4 · Southwest 2411
10:25 AM → 11:25 AM1h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31.
82%
chance on time
- On time (history)
- 77%
- Cancelled
- 0.0%
- Avg arrival delay
- 16 min
- Arrived on time 77% of the time (39 flights, Jun 2025 to May 2026).
- Never cancelled in 39 scheduled flights.
- Departs outside HOU's trouble window (noon to 6 PM, when 80% of its 40 ground stops and delay programs started).
- Short track record (39 flights), so its score leans on the airline's record at this hour.
Limited track record · 39 flights
Find Southwest 2411 fares Opens this date on Aviasales#5 · Southwest 1533
2:50 PM → 3:50 PM1h 00m nonstop
Local times, typical schedule. Last flown 2026-05-27.
76%
chance on time
- On time (history)
- 81%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 81% of the time (16 flights, Jun 2025 to May 2026).
- Departs inside HOU's trouble window: 80% of its 40 ground stops and delay programs started between noon and 6 PM.
- Short track record (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find Southwest 1533 fares Opens this date on Aviasales#6 · Southwest 945
8:30 PM → 9:30 PM1h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 60%
- Cancelled
- 0.0%
- Avg arrival delay
- 34 min
- Arrived on time 60% of the time (15 flights, Jun 2025 to May 2026).
- Departs outside HOU's trouble window (noon to 6 PM, when 80% of its 40 ground stops and delay programs started).
- Short track record (15 flights), so its score leans on the airline's record at this hour.
Limited track record · 15 flights
Find Southwest 945 fares Opens this date on Aviasales#7 · Southwest 2686
10:35 PM → 11:40 PM1h 05m nonstop
Local times, typical schedule. Last flown 2026-04-06.
73%
chance on time
- On time (history)
- 73%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 73% of the time (33 flights, Jun 2025 to May 2026).
- Never cancelled in 33 scheduled flights.
- Leaves in this route's least on-time window (After 9 PM: 63% on time; Before 9 AM: 95%).
- Departs outside HOU's trouble window (noon to 6 PM, when 80% of its 40 ground stops and delay programs started).
Limited track record · 33 flights
Find Southwest 2686 fares Opens this date on Aviasales#8 · Southwest 2808
2:40 PM → 3:45 PM1h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 3300; its record covers all of them.
70%
chance on time
- On time (history)
- 64%
- Cancelled
- 0.0%
- Avg arrival delay
- 22 min
- Arrived on time 64% of the time (88 flights, Jun 2025 to May 2026).
- Never cancelled in 88 scheduled flights.
- Departs inside HOU's trouble window: 80% of its 40 ground stops and delay programs started between noon and 6 PM.
- 55% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 88 flights
Find Southwest 2808 fares Opens this date on Aviasales#9 · Southwest 1753
10:00 PM → 11:00 PM1h 00m nonstop
Local times, typical schedule. Last flown 2026-05-29.
63%
chance on time
- On time (history)
- 52%
- Cancelled
- 0.0%
- Avg arrival delay
- 36 min
- Arrived on time 52% of the time (23 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (After 9 PM: 63% on time; Before 9 AM: 95%).
- Departs outside HOU's trouble window (noon to 6 PM, when 80% of its 40 ground stops and delay programs started).
- 87% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 23 flights
Find Southwest 1753 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines79%
1,408 flights · 79% on time as flown · 0.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM95%
238 flights · avg delay 3 min
- 9 AM to noon87%
348 flights · avg delay 7 min
- Noon to 3 PM70%
165 flights · avg delay 16 min
- 3 to 6 PM80%
132 flights · avg delay 13 min
- 6 to 9 PM74%
305 flights · avg delay 15 min
- After 9 PM63%
220 flights · avg delay 20 min
Best day: Wednesday (83%). Worst: Thursday (77%).
Smarter routing
Nearby airports that run more on time
IAH → SAT 82% chance on time
George Bush Intercontinental Airport to San Antonio International Airport · 2,452 flights a year · 24 mi from your airports · yours: 79%
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 aircraft56%
- Airline (crew, maintenance, boarding)30%
- Air traffic control and airport volume11%
- 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
HOU to SAT questions
- What time of day is best to fly HOU to SAT?
- Before 9 AM: 95% of flights arrived on time, against 63% 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 HOU to SAT?
- Southwest, with a season-adjusted 79% chance of operating and arriving on time over 1,408 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 HOU to SAT?
- June (68% on time); the best was September (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 HOU
- SAT to HOU (return)
- HOU to DAL 81%
- HOU to ATL 79%
- HOU to DEN 77%
- HOU to MSY 83%
- HOU to PHX 79%
- HOU to DFW 78%
- HOU to LAS 81%
- HOU to MCO 77%
- HOU to MDW 74%
- HOU to BNA 78%
- HOU to STL 80%
- HOU to BWI 75%
Live status: FAA delays and ground stops