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Route on-time record

IAH to SAN: most on-time flights and the best time to fly

Houston (George Bush Intercontinental Airport) to San Diego (San Diego International Airport). 1,692 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 0.5% were cancelled. The most reliable flight number was United 2491 at 9:30 AM.

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IAH → SAN

Houston to San Diego: 1,692 nonstop flights a year

On time (12 months)

80%

Cancelled

0.5%

avg delay 13 min

Best time to leave

9 AM to noon

88% on time vs 73% 6 to 9 PM

Most reliable airline

United

80% chance on time

Check IAH to SAN fares

Lowest nonstop fare seen in the next two months: $190 (United 1911 on 2026-11-13). 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. #1 · United 2491

    9:30 AM → 11:04 AM3h 34m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    87%

    chance on time

    On time (history)
    88%
    Cancelled
    0.3%
    Avg arrival delay
    6 min
    • Arrived on time 88% of the time (338 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (9 AM to noon: 88% on time; 6 to 9 PM: 73%).
    • Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
    • Lands inside SAN's trouble window: 66% of its 166 ground stops and delay programs started between 6 AM and noon.

    Strong track record · 338 flights

    Find United 2491 fares Opens this date on Aviasales

  2. #2 · United 2461

    8:03 PM → 9:24 PM3h 21m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    83%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 73% on time; 9 AM to noon: 88%).
    • Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).

    Limited track record · 11 flights

    Find United 2461 fares Opens this date on Aviasales

  3. #3 · United 2418

    4:20 PM → 5:41 PM3h 21m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    82%

    chance on time

    On time (history)
    82%
    Cancelled
    0.0%
    Avg arrival delay
    13 min
    • Arrived on time 82% of the time (11 flights, Jun 2025 to May 2026).
    • Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.

    Limited track record · 11 flights

    Find United 2418 fares Opens this date on Aviasales

  4. #4 · United 1072

    4:31 PM → 6:05 PM3h 34m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    82%

    chance on time

    On time (history)
    83%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 83% of the time (77 flights, Jun 2025 to May 2026).
    • Never cancelled in 77 scheduled flights.
    • Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.

    Moderate track record · 77 flights

    Find United 1072 fares Opens this date on Aviasales

  5. #5 · United 2399

    12:17 PM → 1:50 PM3h 33m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    81%

    chance on time

    On time (history)
    81%
    Cancelled
    0.0%
    Avg arrival delay
    13 min
    • Arrived on time 81% of the time (190 flights, Jun 2025 to May 2026).
    • Never cancelled in 190 scheduled flights.
    • Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.

    Moderate track record · 190 flights

    Find United 2399 fares Opens this date on Aviasales

  6. #6 · United 2690

    6:29 PM → 8:05 PM3h 36m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    74%

    chance on time

    On time (history)
    75%
    Cancelled
    0.0%
    Avg arrival delay
    16 min
    • Arrived on time 75% of the time (73 flights, Jun 2025 to May 2026).
    • Never cancelled in 73 scheduled flights.
    • Leaves in this route's least on-time window (6 to 9 PM: 73% on time; 9 AM to noon: 88%).
    • Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).

    Moderate track record · 73 flights

    Find United 2690 fares Opens this date on Aviasales

  7. #7 · United 1868

    7:50 PM → 9:26 PM3h 36m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    71%

    chance on time

    On time (history)
    75%
    Cancelled
    0.0%
    Avg arrival delay
    11 min
    • Arrived on time 75% of the time (53 flights, Jun 2025 to May 2026).
    • Never cancelled in 53 scheduled flights.
    • Leaves in this route's least on-time window (6 to 9 PM: 73% on time; 9 AM to noon: 88%).
    • Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).

    Limited track record · 53 flights

    Find United 1868 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines80%

    1,692 flights · 80% on time as flown · 0.5% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • 9 AM to noon88%

    340 flights · avg delay 6 min

  • Noon to 3 PM82%

    382 flights · avg delay 12 min

  • 3 to 6 PM83%

    341 flights · avg delay 12 min

  • 6 to 9 PM73%

    604 flights · avg delay 18 min

Best day: Tuesday (85%). Worst: Thursday (77%).

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.

J
85
F
86
M
85
A
82
M
73
J
67
J
69
A
83
S
87
O
83
N
84
D
84

What delays this route

  • Late-arriving aircraft39%
  • Airline (crew, maintenance, boarding)29%
  • Air traffic control and airport volume20%
  • Severe weather11%

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

Finding the most reliable connections from IAH to SAN…

IAH to SAN questions

What time of day is best to fly IAH to SAN?
9 AM to noon: 88% of flights arrived on time, against 73% for departures 6 to 9 PM.
Which airline is most on time from IAH to SAN?
United, with a season-adjusted 80% chance of operating and arriving on time over 1,692 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 IAH to SAN?
June (67% on time); the best was September (87%), 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.

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Live status: FAA delays and ground stops