Southwest Airlines PHX to ONT on-time performance
Southwest Airlines nonstop flights from Phoenix to Ontario · Aug 2025 – Jul 2026
On-time arrivals
74%
arrived < 15 min late
Cancelled
0.2%
3 flights
Avg arrival delay
14 min
49 min when late
Rank on route
#4 of 4
route average 77% on time
Key facts
- Southwest Airlines flights on PHX to ONT arrived on time 74% of the time in Aug 2025 – Jul 2026.
- 0.2% were cancelled, and 7% arrived an hour or more late.
- That ranks #4 of 4 airlines on this route, which averaged 77% on time overall.
- The largest source of delay minutes was late-arriving aircraft (60%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft60%
- Airline (crew, maintenance, cleaning, fueling)35%
- Air traffic control & airport congestion4%
- Security1%
- Extreme weather0%
Other airlines on PHX to ONT
- American Airlines80% on time · 14 min avg delay
- SkyWest Airlines95% on time · 4 min avg delay
- Envoy Air91% on time · 4 min avg delay
Full PHX to ONT comparison →
Southwest Airlines on-time record across all routes →
1,610 Southwest Airlines flights tracked on this route; 3 cancelled, 0 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.