Southwest Airlines ONT to PHX on-time performance
Southwest Airlines nonstop flights from Ontario to Phoenix · Aug 2025 – Jul 2026
On-time arrivals
81%
arrived < 15 min late
Cancelled
0.4%
6 flights
Avg arrival delay
11 min
49 min when late
Rank on route
#4 of 4
route average 82% on time
Key facts
- Southwest Airlines flights on ONT to PHX arrived on time 81% of the time in Aug 2025 – Jul 2026.
- 0.4% were cancelled, and 4% arrived an hour or more late.
- That ranks #4 of 4 airlines on this route, which averaged 82% on time overall.
- The largest source of delay minutes was late-arriving aircraft (52%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft52%
- Air traffic control & airport congestion25%
- Airline (crew, maintenance, cleaning, fueling)22%
- Security0%
- Extreme weather0%
Other airlines on ONT to PHX
- American Airlines84% on time · 17 min avg delay
- SkyWest Airlines88% on time · 6 min avg delay
- Envoy Air89% on time · 4 min avg delay
Full ONT to PHX comparison →
Southwest Airlines on-time record across all routes →
1,610 Southwest Airlines flights tracked on this route; 6 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.