Route on-time record
ONT to PHX: most on-time flights and the best time to fly
Ontario (Ontario International Airport) to Phoenix (Phoenix Sky Harbor International Airport). 3,095 nonstop flights in Jun 2025 to May 2026, 83% arrived within 15 minutes and 0.5% were cancelled. The most reliable flight number was Southwest 2956 at 5:15 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
ONT → PHX
Ontario to Phoenix: 3,095 nonstop flights a year
On time (12 months)
83%
Cancelled
0.5%
avg delay 13 min
Best time to leave
Before 9 AM
90% on time vs 72% 6 to 9 PM
Most reliable airline
SkyWest
84% chance on time
Lowest nonstop fare seen in the next two months: $244 (Southwest 3305 on 2026-11-02). 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 · Southwest 2956
5:15 AM → 6:30 AM1h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31.
93%
chance on time
- On time (history)
- 95%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 95% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 72%).
- Short track record (55 flights), so its score leans on the airline's record at this hour.
Limited track record · 55 flights
Find Southwest 2956 fares Opens this date on Aviasales#2 · American 3168
9:24 AM → 10:45 AM1h 21m nonstop
Local times, typical schedule. Last flown 2026-05-20.
92%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (14 flights, Jun 2025 to May 2026).
- Short track record (14 flights), so its score leans on the airline's record at this hour.
Limited track record · 14 flights
Find American 3168 fares Opens this date on Aviasales#3 · American 1423
9:53 AM → 11:13 AM1h 20m nonstop
Local times, typical schedule. Last flown 2026-04-06.
91%
chance on time
- On time (history)
- 91%
- Cancelled
- 1.4%
- Avg arrival delay
- 14 min
- Arrived on time 91% of the time (137 flights, Jun 2025 to May 2026).
Moderate track record · 137 flights
Find American 1423 fares Opens this date on Aviasales#4 · Southwest 3341
5:40 AM → 6:55 AM1h 15m nonstop
Local times, typical schedule. Last flown 2026-04-06.
89%
chance on time
- On time (history)
- 88%
- Cancelled
- 3.0%
- Avg arrival delay
- 3 min
- Arrived on time 88% of the time (32 flights, Jun 2025 to May 2026).
- Cancelled 3.0% of the time (1 of 33).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 72%).
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find Southwest 3341 fares Opens this date on Aviasales#5 · Southwest 3664
8:10 AM → 9:25 AM1h 15m nonstop
Local times, typical schedule. Last flown 2026-05-29.
88%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 92% of the time (39 flights, Jun 2025 to May 2026).
- Never cancelled in 39 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 72%).
- Short track record (39 flights), so its score leans on the airline's record at this hour.
Limited track record · 39 flights
Find Southwest 3664 fares Opens this date on Aviasales#6 · American 1194
6:15 AM → 7:37 AM1h 22m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 1591; its record covers all of them.
88%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.6%
- Avg arrival delay
- 12 min
- Arrived on time 89% of the time (361 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 72%).
Strong track record · 361 flights
Find American 1194 fares Opens this date on Aviasales#7 · Southwest 4253
8:40 AM → 9:55 AM1h 15m nonstop
Local times, typical schedule. Last flown 2026-05-30. Same departure also flew as Southwest 3325; its record covers all of them.
86%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 87% of the time (23 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 72%).
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 4253 fares Opens this date on Aviasales#8 · Southwest 4138
1:00 PM → 2:20 PM1h 20m nonstop
Local times, typical schedule. Last flown 2026-04-06.
85%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 93% of the time (15 flights, Jun 2025 to May 2026).
- Lands inside PHX's trouble window: 43% of its 46 ground stops and delay programs started between 2 PM and 8 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 4138 fares Opens this date on Aviasales#9 · American 2244
1:10 PM → 2:34 PM1h 24m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 14 min
- Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
- Lands inside PHX's trouble window: 43% of its 46 ground stops and delay programs started between 2 PM and 8 PM.
- 94% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find American 2244 fares Opens this date on Aviasales#10 · Southwest 1474
3:00 PM → 4:20 PM1h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 313; its record covers all of them.
83%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 6 min
- Arrived on time 90% of the time (77 flights, Jun 2025 to May 2026).
- Never cancelled in 77 scheduled flights.
- Lands inside PHX's trouble window: 43% of its 46 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 77 flights
Find Southwest 1474 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)84%
119 flights · 85% on time as flown · 0.7% cancel
- Envoy Air (sold as American Eagle)83%
47 flights · 87% on time as flown · 0.4% cancel
- American Airlines82%
1,321 flights · 83% on time as flown · 0.7% cancel
- Southwest Airlines82%
1,608 flights · 83% on time as flown · 0.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM90%
869 flights · avg delay 8 min
- 9 AM to noon89%
432 flights · avg delay 9 min
- Noon to 3 PM84%
621 flights · avg delay 14 min
- 3 to 6 PM77%
696 flights · avg delay 15 min
- 6 to 9 PM72%
462 flights · avg delay 19 min
Best day: Saturday (89%). Worst: Friday (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.
What delays this route
- Late-arriving aircraft46%
- Airline (crew, maintenance, boarding)37%
- Air traffic control and airport volume16%
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 PHX questions
- What time of day is best to fly ONT to PHX?
- Before 9 AM: 90% of flights arrived on time, against 72% 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 ONT to PHX?
- SkyWest, with a season-adjusted 84% chance of operating and arriving on time over 119 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 PHX?
- June (81% 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 ONT
- PHX to ONT (return)
- 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%
- ONT to IAH 85%
Live status: FAA delays and ground stops