Route on-time record
SAT to IAH: most on-time flights and the best time to fly
San Antonio (San Antonio International Airport) to Houston (George Bush Intercontinental Airport). 2,451 nonstop flights in Jun 2025 to May 2026, 81% arrived within 15 minutes and 1.0% were cancelled. The most reliable flight number was United 469 at 5:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SAT → IAH
San Antonio to Houston: 2,451 nonstop flights a year
On time (12 months)
81%
Cancelled
1.0%
avg delay 14 min
Best time to leave
9 AM to noon
86% on time vs 75% 3 to 6 PM
Most reliable airline
United
81% chance on time
Lowest nonstop fare seen in the next two months: $151 (United 4053 on 2026-10-22). 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 469
5:00 AM → 6:07 AM1h 07m nonstop
Local times, typical schedule. Last flown 2026-05-31.
93%
chance on time
- On time (history)
- 96%
- Cancelled
- 3.3%
- Avg arrival delay
- 4 min
- Arrived on time 96% of the time (231 flights, Jun 2025 to May 2026).
- Cancelled 3.3% of the time (8 of 241).
Strong track record · 231 flights
Find United 469 fares Opens this date on Aviasales#2 · United 1571
2:14 PM → 3:22 PM1h 08m nonstop
Local times, typical schedule. Last flown 2026-05-20.
87%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.0%
- Avg arrival delay
- 6 min
- Arrived on time 92% of the time (52 flights, Jun 2025 to May 2026).
- Never cancelled in 52 scheduled flights.
- Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- Short track record (52 flights), so its score leans on the airline's record at this hour.
Limited track record · 52 flights
Find United 1571 fares Opens this date on Aviasales#3 · United 1282
11:46 AM → 12:47 PM1h 02m nonstop
Local times, typical schedule. Last flown 2026-05-20.
86%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.4%
- Avg arrival delay
- 11 min
- Arrived on time 87% of the time (231 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 86% on time; 3 to 6 PM: 75%).
- Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
Strong track record · 231 flights
Find United 1282 fares Opens this date on Aviasales#4 · United 2654
7:15 PM → 8:24 PM1h 09m nonstop
Local times, typical schedule. Last flown 2026-04-29.
85%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 94% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find United 2654 fares Opens this date on Aviasales#5 · United 2658
2:20 PM → 3:27 PM1h 07m nonstop
Local times, typical schedule. Last flown 2026-03-28.
83%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 88% of the time (82 flights, Jun 2025 to May 2026).
- Never cancelled in 82 scheduled flights.
- Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
Moderate track record · 82 flights
Find United 2658 fares Opens this date on Aviasales#6 · United 589
9:52 AM → 10:59 AM1h 07m nonstop
Local times, typical schedule. Last flown 2026-03-28.
83%
chance on time
- On time (history)
- 83%
- Cancelled
- 4.2%
- Avg arrival delay
- 20 min
- Arrived on time 83% of the time (23 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 86% on time; 3 to 6 PM: 75%).
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find United 589 fares Opens this date on Aviasales#7 · United 740
7:43 AM → 8:50 AM1h 07m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 410; its record covers all of them.
81%
chance on time
- On time (history)
- 85%
- Cancelled
- 1.2%
- Avg arrival delay
- 14 min
- Arrived on time 85% of the time (162 flights, Jun 2025 to May 2026).
Moderate track record · 162 flights
Find United 740 fares Opens this date on Aviasales#8 · SkyWest 5658 · sold as United Express, Delta Connection, American Eagle or Alaska
7:20 PM → 8:33 PM1h 13m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (9 flights, Jun 2025 to May 2026).
- Short track record (9 flights), so its score leans on the airline's record at this hour.
Limited track record · 9 flights
Find 7:20 PM flight fares Opens this date on Aviasales#9 · SkyWest 5841 · sold as United Express, Delta Connection, American Eagle or Alaska
6:52 PM → 8:05 PM1h 13m nonstop
Local times, typical schedule. Last flown 2026-03-28.
79%
chance on time
- On time (history)
- 86%
- Cancelled
- 4.3%
- Avg arrival delay
- 17 min
- Arrived on time 86% of the time (22 flights, Jun 2025 to May 2026).
- Short track record (22 flights), so its score leans on the airline's record at this hour.
Limited track record · 22 flights
Find 6:52 PM flight fares Opens this date on Aviasales#10 · United 404
4:10 PM → 5:25 PM1h 07m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
- On time (history)
- 81%
- Cancelled
- 0.0%
- Avg arrival delay
- 22 min
- Arrived on time 81% of the time (109 flights, Jun 2025 to May 2026).
- Never cancelled in 109 scheduled flights.
- Leaves in this route's least on-time window (3 to 6 PM: 75% on time; 9 AM to noon: 86%).
- Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
Moderate track record · 109 flights
Find United 404 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines81%
2,361 flights · 82% on time as flown · 1.0% cancel
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)79%
90 flights · 77% on time as flown · 1.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM85%
619 flights · avg delay 10 min
- 9 AM to noon86%
611 flights · avg delay 9 min
- Noon to 3 PM81%
345 flights · avg delay 21 min
- 3 to 6 PM75%
563 flights · avg delay 18 min
- 6 to 9 PM78%
313 flights · avg delay 17 min
Best day: Saturday (86%). Worst: Friday (80%).
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
- Air traffic control and airport volume44%
- Late-arriving aircraft33%
- Airline (crew, maintenance, boarding)22%
- 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
SAT to IAH questions
- What time of day is best to fly SAT to IAH?
- 9 AM to noon: 86% of flights arrived on time, against 75% for departures 3 to 6 PM.
- Which airline is most on time from SAT to IAH?
- United, with a season-adjusted 81% chance of operating and arriving on time over 2,361 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 IAH?
- July (75% on time); the best was February (88%), 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
- IAH 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 LAS 83%
- 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