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Route on-time record

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

San Diego (San Diego International Airport) to Houston (George Bush Intercontinental Airport). 1,692 nonstop flights in Jun 2025 to May 2026, 84% arrived within 15 minutes and 0.7% were cancelled. The most reliable flight number was United 1980 at 10:23 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

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SAN → IAH

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

On time (12 months)

84%

Cancelled

0.7%

avg delay 13 min

Best time to leave

Before 9 AM

92% on time vs 79% 3 to 6 PM

Most reliable airline

United

84% chance on time

Check SAN to IAH fares

Lowest nonstop fare seen in the next two months: $392 (United 618 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. #1 · United 1980

    10:23 AM → 3:39 PM3h 15m nonstop

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

    91%

    chance on time

    On time (history)
    95%
    Cancelled
    1.0%
    Avg arrival delay
    10 min
    • Arrived on time 95% of the time (97 flights, Jun 2025 to May 2026).
    • Departs inside SAN's trouble window: 66% of its 166 ground stops and delay programs started between 6 AM and noon.
    • Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.

    Moderate track record · 97 flights

    Find United 1980 fares Opens this date on Aviasales

  2. #2 · United 1501

    6:15 AM → 11:42 AM3h 27m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 496; its record covers all of them.

    90%

    chance on time

    On time (history)
    91%
    Cancelled
    0.8%
    Avg arrival delay
    7 min
    • Arrived on time 91% of the time (237 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 92% on time; 3 to 6 PM: 79%).
    • Departs inside SAN's trouble window: 66% of its 166 ground stops and delay programs started between 6 AM and noon.

    Strong track record · 237 flights

    Find United 1501 fares Opens this date on Aviasales

  3. #3 · United 2165

    10:13 AM → 3:40 PM3h 27m nonstop

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

    89%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
    • Departs inside SAN's trouble window: 66% of its 166 ground stops and delay programs started between 6 AM and noon.
    • Lands 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 2165 fares Opens this date on Aviasales

  4. #4 · United 2683

    5:00 PM → 10:15 PM3h 15m nonstop

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

    83%

    chance on time

    On time (history)
    85%
    Cancelled
    0.0%
    Avg arrival delay
    17 min
    • Arrived on time 85% of the time (137 flights, Jun 2025 to May 2026).
    • Never cancelled in 137 scheduled flights.
    • Leaves in this route's least on-time window (3 to 6 PM: 79% on time; Before 9 AM: 92%).
    • Departs outside SAN's trouble window (6 AM to noon, when 66% of its 166 ground stops and delay programs started).

    Moderate track record · 137 flights

    Find United 2683 fares Opens this date on Aviasales

  5. #5 · United 1950

    3:04 PM → 8:20 PM3h 16m nonstop

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

    81%

    chance on time

    On time (history)
    86%
    Cancelled
    1.9%
    Avg arrival delay
    15 min
    • Arrived on time 86% of the time (51 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 79% on time; Before 9 AM: 92%).
    • Departs outside SAN's trouble window (6 AM to noon, when 66% of its 166 ground stops and delay programs started).
    • 66% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 51 flights

    Find United 1950 fares Opens this date on Aviasales

  6. #6 · United 2237

    12:10 PM → 5:25 PM3h 15m nonstop

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

    80%

    chance on time

    On time (history)
    81%
    Cancelled
    0.3%
    Avg arrival delay
    11 min
    • Arrived on time 81% of the time (311 flights, Jun 2025 to May 2026).
    • Departs outside SAN's trouble window (6 AM to noon, when 66% of its 166 ground stops and delay programs started).
    • Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.

    Strong track record · 311 flights

    Find United 2237 fares Opens this date on Aviasales

  7. #7 · United 349

    5:15 PM → 10:36 PM3h 21m nonstop

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

    78%

    chance on time

    On time (history)
    64%
    Cancelled
    0.0%
    Avg arrival delay
    23 min
    • Arrived on time 64% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 79% on time; Before 9 AM: 92%).
    • Departs outside SAN's trouble window (6 AM to noon, when 66% of its 166 ground stops and delay programs started).
    • 90% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 11 flights

    Find United 349 fares Opens this date on Aviasales

  8. #8 · United 618

    3:10 PM → 8:31 PM3h 21m nonstop

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

    77%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    26 min
    • Arrived on time 73% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 79% on time; Before 9 AM: 92%).
    • Departs outside SAN's trouble window (6 AM to noon, when 66% of its 166 ground stops and delay programs started).
    • 86% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 11 flights

    Find United 618 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines84%

    1,692 flights · 84% on time as flown · 0.7% cancel

On time by departure time

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

  • Before 9 AM92%

    433 flights · avg delay 6 min

  • 9 AM to noon86%

    455 flights · avg delay 12 min

  • Noon to 3 PM80%

    409 flights · avg delay 15 min

  • 3 to 6 PM79%

    346 flights · avg delay 18 min

Best day: Tuesday (88%). Worst: Sunday (83%).

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
88
F
91
M
87
A
91
M
82
J
78
J
73
A
82
S
89
O
87
N
87
D
82

What delays this route

  • Late-arriving aircraft50%
  • Air traffic control and airport volume30%
  • Airline (crew, maintenance, boarding)15%
  • Severe weather4%

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 SAN to IAH…

SAN to IAH questions

What time of day is best to fly SAN to IAH?
Before 9 AM: 92% of flights arrived on time, against 79% for departures 3 to 6 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from SAN to IAH?
United, with a season-adjusted 84% 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 SAN to IAH?
July (73% on time); the best was February (91%), 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