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8 nonstop · ranked by overall best · 4 hidden by your Most reliable time setting (they leave at other times of day) · showing the top 3
Most reliable time: morning departures (5–11 AM), the window with the best on-time odds for this trip. Turn off “Most reliable” under Departure time in Advanced settings to see every time.
Fares seen on this date: nonstop from 254 (recent searches, one way, per person; each card opens the live price)
4 matching trips
Why this is our top pick
- This morning flight leaves in the most reliable time of day on this route: its best departures have an 86% reliability rating vs 63% for overnight departures.
- Compared with the next-best option (Southwest 1682 on the Boeing 737-700), it arrives on time 4 points more often.
- Legroom was comparable across the flights we compared (31 in), so it didn't set them apart.
Aircraft and legroom reflect the planes each flight has flown recently. Airlines can swap planes and seat maps change, so check the airline’s seat map when you book.
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.
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%
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