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Route on-time record

HOU to HRL: most on-time flights and the best time to fly

Houston (William P. Hobby Airport) to Harlingen (Valley International Airport). 1,224 nonstop flights in Jun 2025 to May 2026, 76% arrived within 15 minutes and 0.2% were cancelled. The most reliable flight number was Southwest 3859 at 10:35 AM.

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

HOU → HRL

Houston to Harlingen: 1,224 nonstop flights a year

On time (12 months)

76%

Cancelled

0.2%

avg delay 13 min

Best time to leave

Before 9 AM

94% on time vs 59% after 9 PM

Most reliable airline

Southwest

76% chance on time

Check HOU to HRL fares

Lowest nonstop fare seen in the next two months: $161 (Southwest 3203 on 2026-11-15). 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 · Southwest 3859

    10:35 AM → 11:45 AM1h 10m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 3157; its record covers all of them.

    86%

    chance on time

    On time (history)
    86%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 86% of the time (88 flights, Jun 2025 to May 2026).
    • Never cancelled in 88 scheduled flights.
    • Departs outside HOU's trouble window (noon to 6 PM, when 80% of its 40 ground stops and delay programs started).

    Moderate track record · 88 flights

    Find Southwest 3859 fares Opens this date on Aviasales

  2. #2 · Southwest 762

    4:50 PM → 5:55 PM1h 05m nonstop

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

    78%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
    • Departs inside HOU's trouble window: 80% of its 40 ground stops and delay programs started between noon and 6 PM.
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 762 fares Opens this date on Aviasales

  3. #3 · Southwest 2324

    4:20 PM → 5:25 PM1h 05m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    72%

    chance on time

    On time (history)
    64%
    Cancelled
    0.0%
    Avg arrival delay
    16 min
    • Arrived on time 64% of the time (39 flights, Jun 2025 to May 2026).
    • Never cancelled in 39 scheduled flights.
    • Departs inside HOU's trouble window: 80% of its 40 ground stops and delay programs started between noon and 6 PM.
    • Short track record (39 flights), so its score leans on the airline's record at this hour.

    Limited track record · 39 flights

    Find Southwest 2324 fares Opens this date on Aviasales

  4. #4 · Southwest 3328

    10:55 PM → 12:05 AM1h 10m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    70%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    14 min
    • Arrived on time 73% of the time (33 flights, Jun 2025 to May 2026).
    • Never cancelled in 33 scheduled flights.
    • Leaves in this route's least on-time window (After 9 PM: 59% on time; Before 9 AM: 94%).
    • Departs outside HOU's trouble window (noon to 6 PM, when 80% of its 40 ground stops and delay programs started).

    Limited track record · 33 flights

    Find Southwest 3328 fares Opens this date on Aviasales

  5. #5 · Southwest 2989

    3:30 PM → 4:35 PM1h 10m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    66%

    chance on time

    On time (history)
    54%
    Cancelled
    0.0%
    Avg arrival delay
    26 min
    • Arrived on time 54% of the time (28 flights, Jun 2025 to May 2026).
    • Departs inside HOU's trouble window: 80% of its 40 ground stops and delay programs started between noon and 6 PM.
    • 60% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (28 flights), so its score leans on the airline's record at this hour.

    Limited track record · 28 flights

    Find Southwest 2989 fares Opens this date on Aviasales

  6. #6 · Southwest 2325

    9:55 PM → 11:00 PM1h 05m nonstop

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

    63%

    chance on time

    On time (history)
    56%
    Cancelled
    0.0%
    Avg arrival delay
    24 min
    • Arrived on time 56% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • Leaves in this route's least on-time window (After 9 PM: 59% on time; Before 9 AM: 94%).
    • Departs outside HOU's trouble window (noon to 6 PM, when 80% of its 40 ground stops and delay programs started).

    Limited track record · 55 flights

    Find Southwest 2325 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines76%

    1,224 flights · 76% on time as flown · 0.2% cancel

On time by departure time

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

  • Before 9 AM94%

    209 flights · avg delay 4 min

  • 9 AM to noon85%

    201 flights · avg delay 8 min

  • Noon to 3 PM83%

    147 flights · avg delay 8 min

  • 3 to 6 PM70%

    205 flights · avg delay 14 min

  • 6 to 9 PM72%

    200 flights · avg delay 14 min

  • After 9 PM59%

    262 flights · avg delay 24 min

Best day: Tuesday (84%). Worst: Friday (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
86
F
88
M
80
A
81
M
69
J
69
J
63
A
82
S
86
O
82
N
86
D
81

What delays this route

  • Late-arriving aircraft56%
  • Airline (crew, maintenance, boarding)32%
  • Severe weather6%
  • Air traffic control and airport volume5%

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 HOU to HRL…

HOU to HRL questions

What time of day is best to fly HOU to HRL?
Before 9 AM: 94% of flights arrived on time, against 59% for departures after 9 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 HOU to HRL?
Southwest, with a season-adjusted 76% chance of operating and arriving on time over 1,224 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 HOU to HRL?
July (63% 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 HOU

Live status: FAA delays and ground stops