Skip to content

All Products

Aviation Intelligence

Alerts & Airspace

Free Pilot Tools & Widgets

RC Aviation

Games & Learning

Weather Research & More

Pilot Resources

My Airports

Your shortcuts, saved on this device. Search to add an airport.

No airports saved yet. Add the fields you visit most.

Ask ATIS

Route on-time record

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

St Louis (St. Louis Lambert International Airport) to Houston (William P. Hobby Airport). 1,546 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 0.3% were cancelled. The most reliable flight number was Southwest 4466 at 5:15 AM.

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

STL → HOU

St Louis to Houston: 1,546 nonstop flights a year

On time (12 months)

80%

Cancelled

0.3%

avg delay 12 min

Best time to leave

Before 9 AM

93% on time vs 64% 6 to 9 PM

Most reliable airline

Southwest

80% chance on time

Check STL to HOU fares

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 4466

    5:15 AM → 7:30 AM2h 10m nonstop

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

    93%

    chance on time

    On time (history)
    94%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 94% of the time (53 flights, Jun 2025 to May 2026).
    • Never cancelled in 54 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 64%).
    • Short track record (53 flights), so its score leans on the airline's record at this hour.

    Limited track record · 53 flights

    Find Southwest 4466 fares Opens this date on Aviasales

  2. #2 · Southwest 4467

    8:35 AM → 10:45 AM2h 10m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 784; its record covers all of them.

    90%

    chance on time

    On time (history)
    92%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 92% of the time (77 flights, Jun 2025 to May 2026).
    • Never cancelled in 78 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 64%).

    Moderate track record · 77 flights

    Find Southwest 4467 fares Opens this date on Aviasales

  3. #3 · Southwest 4542

    6:30 AM → 8:45 AM2h 15m nonstop

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

    86%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 88% of the time (33 flights, Jun 2025 to May 2026).
    • Never cancelled in 33 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 64%).
    • Short track record (33 flights), so its score leans on the airline's record at this hour.

    Limited track record · 33 flights

    Find Southwest 4542 fares Opens this date on Aviasales

  4. #4 · Southwest 1712

    1:55 PM → 4:10 PM2h 15m nonstop

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

    78%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    20 min
    • Arrived on time 73% of the time (15 flights, Jun 2025 to May 2026).
    • Lands inside HOU's trouble window: 80% of its 40 ground stops and delay programs started between noon and 6 PM.
    • Short track record (15 flights), so its score leans on the airline's record at this hour.

    Limited track record · 15 flights

    Find Southwest 1712 fares Opens this date on Aviasales

  5. #5 · Southwest 4468

    12:25 PM → 2:35 PM2h 10m nonstop

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

    72%

    chance on time

    On time (history)
    65%
    Cancelled
    0.0%
    Avg arrival delay
    19 min
    • Arrived on time 65% of the time (46 flights, Jun 2025 to May 2026).
    • Never cancelled in 46 scheduled flights.
    • Lands inside HOU's trouble window: 80% of its 40 ground stops and delay programs started between noon and 6 PM.
    • Short track record (46 flights), so its score leans on the airline's record at this hour.

    Limited track record · 46 flights

    Find Southwest 4468 fares Opens this date on Aviasales

  6. #6 · Southwest 865

    6:30 PM → 8:45 PM2h 15m nonstop

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

    71%

    chance on time

    On time (history)
    78%
    Cancelled
    0.0%
    Avg arrival delay
    14 min
    • Arrived on time 78% of the time (23 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 64% on time; Before 9 AM: 93%).
    • 66% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 865 fares Opens this date on Aviasales

  7. #7 · Southwest 2082

    9:45 PM → 11:55 PM2h 10m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2311; its record covers all of them.

    71%

    chance on time

    On time (history)
    69%
    Cancelled
    0.0%
    Avg arrival delay
    23 min
    • Arrived on time 69% of the time (87 flights, Jun 2025 to May 2026).
    • Never cancelled in 87 scheduled flights.
    • 63% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 87 flights

    Find Southwest 2082 fares Opens this date on Aviasales

  8. #8 · Southwest 1753

    7:15 PM → 9:25 PM2h 10m nonstop

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

    64%

    chance on time

    On time (history)
    57%
    Cancelled
    0.0%
    Avg arrival delay
    36 min
    • Arrived on time 57% of the time (23 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 64% on time; Before 9 AM: 93%).
    • 58% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 1753 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines80%

    1,546 flights · 80% on time as flown · 0.3% cancel

On time by departure time

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

  • Before 9 AM93%

    536 flights · avg delay 3 min

  • 9 AM to noon87%

    156 flights · avg delay 8 min

  • Noon to 3 PM77%

    211 flights · avg delay 16 min

  • 3 to 6 PM77%

    144 flights · avg delay 10 min

  • 6 to 9 PM64%

    314 flights · avg delay 21 min

  • After 9 PM67%

    185 flights · avg delay 22 min

Best day: Tuesday (84%). Worst: Monday (76%).

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
79
F
90
M
78
A
81
M
73
J
71
J
71
A
78
S
84
O
84
N
85
D
80

What delays this route

  • Late-arriving aircraft55%
  • Airline (crew, maintenance, boarding)28%
  • Air traffic control and airport volume14%
  • 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

STL to HOU questions

What time of day is best to fly STL to HOU?
Before 9 AM: 93% of flights arrived on time, against 64% for departures 6 to 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 STL to HOU?
Southwest, with a season-adjusted 80% chance of operating and arriving on time over 1,546 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 STL to HOU?
June (71% on time); the best was February (90%), 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 STL

Live status: FAA delays and ground stops