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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.

IAH → SAT

Houston to San Antonio: 2,452 nonstop flights a year

On time (12 months)

83%

Cancelled

0.9%

avg delay 12 min

Best time to leave

Before 9 AM

95% on time vs 74% 6 to 9 PM

Most reliable airline

United

82% chance on time

Check IAH to SAT fares

Lowest nonstop fare seen in the next two months: $219 (United 2250 on 2026-10-22). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Best trips

11 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

    7:35 AM → 8:42 AM

    91%

    arrive on time

    7:35 AM IAH → 8:42 AM SAT1h 07m

    United 2250

    Airbus A320 or Boeing 737-800 · 3–28 yrs old
    92% on time · 0.8% cancel
    Find United 2250 fares Opens this date on Aviasales

  2. #2 · Nonstop · 1h 13m

    11:55 AM → 1:08 PM

    87%

    arrive on time

    11:55 AM IAH → 1:08 PM SAT1h 13m

    United 468

    Boeing 737-900ER or 737-900 · 4–25 yrs old
    87% on time · 0.3% cancel
    Find United 468 fares Opens this date on Aviasales

  3. #3 · Nonstop · 1h 14m

    2:32 PM → 3:46 PM

    86%

    arrive on time

    2:32 PM IAH → 3:46 PM SAT1h 14m

    United 697

    Airbus A320 or Boeing 737-800 · 19–29 yrs old
    87% on time · 0.4% cancel
    Find United 697 fares Opens this date on Aviasales

  4. #4 · Nonstop · 1h 07m

    9:43 AM → 10:50 AM

    84%

    arrive on time

    9:43 AM IAH → 10:50 AM SAT1h 07m

    United 1371

    Airbus A319 · 19–29 yrs old
    84% on time · 0.3% cancel
    Find United 1371 fares Opens this date on Aviasales

  5. #5 · Nonstop · 1h 09m

    4:35 PM → 5:44 PM

    81%

    arrive on time

    4:35 PM IAH → 5:44 PM SAT1h 09m

    SkyWest 5379 · sold as United Express, Delta Connection, American Eagle or Alaska · also flew as 5807

    Embraer E175 · 9–12 yrs old
    82% on time · 1.3% cancel
    Find 4:35 PM flight fares Opens this date on Aviasales

  6. #6 · Nonstop · 1h 13m

    12:01 PM → 1:14 PM

    81%

    arrive on time

    12:01 PM IAH → 1:14 PM SAT1h 13m

    United 1464

    Boeing 737-900ER · 11–18 yrs old
    82% on time · 0.7% cancel
    Find United 1464 fares Opens this date on Aviasales

  7. #7 · Nonstop · 1h 07m

    9:50 PM → 10:57 PM

    79%

    arrive on time

    9:50 PM IAH → 10:57 PM SAT1h 07m

    United 2198

    Boeing 737 MAX 8 or Airbus A319 · 1–28 yrs old
    80% on time · 1.2% cancel
    Find United 2198 fares Opens this date on Aviasales

  8. #8 · Nonstop · 1h 10m

    4:33 PM → 5:43 PM

    77%

    arrive on time

    4:33 PM IAH → 5:43 PM SAT1h 10m

    United 1407

    Boeing 737-800 · 2–28 yrs old
    78% on time · 0.7% cancel
    Find United 1407 fares Opens this date on Aviasales

  9. #9 · Nonstop · 1h 13m

    8:12 PM → 9:25 PM

    77%

    arrive on time

    8:12 PM IAH → 9:25 PM SAT1h 13m

    United 1528

    Boeing 737-800 or Airbus A319 · 10–28 yrs old
    78% on time · 1.9% cancel
    Find United 1528 fares Opens this date on Aviasales

  10. #10 · Nonstop · 1h 13m

    7:50 PM → 9:03 PM

    77%

    arrive on time

    7:50 PM IAH → 9:03 PM SAT1h 13m

    United 1542

    Boeing 737-700 · 13–28 yrs old
    77% on time · 1.1% cancel
    Find United 1542 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 Airlines82%

    2,363 flights · 83% on time as flown · 0.8% cancel

  • SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)80%

    89 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 AM95%

    337 flights · avg delay 3 min

  • 9 AM to noon87%

    384 flights · avg delay 7 min

  • Noon to 3 PM84%

    538 flights · avg delay 11 min

  • 3 to 6 PM79%

    207 flights · avg delay 14 min

  • 6 to 9 PM74%

    728 flights · avg delay 18 min

  • After 9 PM82%

    258 flights · avg delay 15 min

Best day: Tuesday (83%). Worst: Friday (77%).

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