Route on-time record
ONT to HOU: most on-time flights and the best time to fly
Ontario (Ontario International Airport) to Houston (William P. Hobby Airport). 362 nonstop flights in Jun 2025 to May 2026, 68% arrived within 15 minutes and 0.0% were cancelled. The most reliable flight number was Southwest 3654 at 1:50 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
ONT → HOU
Ontario to Houston: 362 nonstop flights a year
On time (12 months)
68%
Cancelled
0.0%
avg delay 17 min
Best time to leave
Before 9 AM
97% on time vs 45% noon to 3 PM
Most reliable airline
Southwest
68% chance on time
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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 · Southwest 3654
1:50 PM → 6:50 PM3h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31.
55%
chance on time
- On time (history)
- 44%
- Cancelled
- 0.0%
- Avg arrival delay
- 19 min
- Arrived on time 44% 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 (Noon to 3 PM: 45% on time; Before 9 AM: 97%).
- Short track record (55 flights), so its score leans on the airline's record at this hour.
Limited track record · 55 flights
Find Southwest 3654 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines68%
362 flights · 68% on time as flown · 0.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM97%
142 flights · avg delay 5 min
- Noon to 3 PM45%
202 flights · avg delay 27 min
Best day: Tuesday (88%). Worst: Friday (71%).
Smarter routing
Nearby airports that run more on time
SNA → IAH 88% chance on time
John Wayne Orange County International Airport to George Bush Intercontinental Airport · 1,094 flights a year · 54 mi from your airports · yours: 68%
ONT → IAH 84% chance on time
Ontario International Airport to George Bush Intercontinental Airport · 516 flights a year · 24 mi from your airports · yours: 68%
LAX → IAH 83% chance on time
Los Angeles International Airport to George Bush Intercontinental Airport · 5,291 flights a year · 71 mi from your airports · yours: 68%
LGB → HOU 79% chance on time
Long Beach International Airport to William P. Hobby Airport · 503 flights a year · 36 mi from your airports · yours: 68%
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.
What delays this route
- Late-arriving aircraft45%
- Airline (crew, maintenance, boarding)36%
- Air traffic control and airport volume18%
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
ONT to HOU questions
- What time of day is best to fly ONT to HOU?
- Before 9 AM: 97% of flights arrived on time, against 45% for departures noon to 3 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 ONT to HOU?
- Southwest, with a season-adjusted 68% chance of operating and arriving on time over 362 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 ONT to HOU?
- May (67% on time); the best was September (98%), 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 ONT
- HOU to ONT (return)
- ONT to PHX 83%
- ONT to DEN 79%
- ONT to SEA 86%
- ONT to LAS 78%
- ONT to DFW 78%
- ONT to SMF 86%
- ONT to OAK 87%
- ONT to SJC 86%
- ONT to SFO 69%
- ONT to SLC 91%
- ONT to ATL 90%
- ONT to PDX 88%
Live status: FAA delays and ground stops