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ATIS Alerts Smart Flight Search

Find the flight least likely to be delayed

Beta

We rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.

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

Check SAT to IAH fares

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.

Best trips

12 nonstop. Best overall weighs the chance you arrive on time as booked, connection odds, travel time and separate tickets.

  1. Best overall#1 · Nonstop · 1h 07m

    5:00 AM → 6:07 AM

    93%

    arrive on time

    5:00 AM SAT → 6:07 AM IAH1h 07m

    United 469

    Boeing 737-800 or Airbus A319 · 4–28 yrs old
    95% on time · 2.4% cancel
    Find United 469 fares Opens this date on Aviasales

  2. #2 · Nonstop · 1h 08m

    2:14 PM → 3:22 PM

    87%

    arrive on time

    2:14 PM SAT → 3:22 PM IAH1h 08m

    United 1571

    Boeing 737-900ER or 737-900 · 10–25 yrs old
    88% on time · 0.7% cancel
    Find United 1571 fares Opens this date on Aviasales

  3. #3 · Nonstop · 1h 02m

    11:46 AM → 12:47 PM

    86%

    arrive on time

    11:46 AM SAT → 12:47 PM IAH1h 02m

    United 1282

    Airbus A319 · 19–29 yrs old
    87% on time · 0.6% cancel
    Find United 1282 fares Opens this date on Aviasales

  4. #4 · Nonstop · 1h 09m

    7:15 PM → 8:24 PM

    85%

    arrive on time

    7:15 PM SAT → 8:24 PM IAH1h 09m

    United 2654

    Boeing 737-800 · 2–28 yrs old
    86% on time · 0.8% cancel
    Find United 2654 fares Opens this date on Aviasales

  5. #5 · Nonstop · 1h 07m

    2:20 PM → 3:27 PM

    83%

    arrive on time

    2:20 PM SAT → 3:27 PM IAH1h 07m

    United 2658

    Boeing 737-900ER · 4–26 yrs old
    83% on time · 0.6% cancel
    Find United 2658 fares Opens this date on Aviasales

  6. #6 · Nonstop · 1h 07m

    9:52 AM → 10:59 AM

    83%

    arrive on time

    9:52 AM SAT → 10:59 AM IAH1h 07m

    United 589

    Boeing 737-800 · 9–28 yrs old
    84% on time · 1.4% cancel
    Find United 589 fares Opens this date on Aviasales

  7. #7 · Nonstop · 1h 07m

    7:43 AM → 8:50 AM

    81%

    arrive on time

    7:43 AM SAT → 8:50 AM IAH1h 07m

    United 740 · also flew as 410

    Boeing 737-700 · 16–28 yrs old
    82% on time · 1.1% cancel
    Find United 740 fares Opens this date on Aviasales

  8. #8 · Nonstop · 1h 13m

    7:20 PM → 8:33 PM

    80%

    arrive on time

    7:20 PM SAT → 8:33 PM IAH1h 13m

    SkyWest 5658 · sold as United Express, Delta Connection, American Eagle or Alaska

    Embraer E175 · 9–12 yrs old
    81% on time · 1.0% cancel
    Find 7:20 PM flight fares Opens this date on Aviasales

  9. #9 · Nonstop · 1h 13m

    6:52 PM → 8:05 PM

    79%

    arrive on time

    6:52 PM SAT → 8:05 PM IAH1h 13m

    SkyWest 5841 · sold as United Express, Delta Connection, American Eagle or Alaska

    Embraer E175 · 9–12 yrs old
    81% on time · 1.5% cancel
    Find 6:52 PM flight fares Opens this date on Aviasales

  10. #10 · Nonstop · 1h 07m

    4:17 PM → 5:25 PM

    79%

    arrive on time

    4:17 PM SAT → 5:25 PM IAH1h 07m

    United 404

    Boeing 737 MAX 9 or Airbus A319 · 1–28 yrs old
    79% on time · 0.6% cancel
    Find United 404 fares Opens this date on Aviasales

Aircraft and ages come from the planes each flight number actually flew in the last 3 months of data (FAA registry build years); airlines can swap planes.

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%).

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