Southwest Airlines ONT to LAS on-time performance
Southwest Airlines nonstop flights from Ontario to Las Vegas · Aug 2025 – Jul 2026
On-time arrivals
77%
arrived < 15 min late
Cancelled
0.7%
12 flights
Avg arrival delay
12 min
50 min when late
Rank on route
#2 of 2
route average 77% on time
Key facts
- Southwest Airlines flights on ONT to LAS arrived on time 77% of the time in Aug 2025 – Jul 2026.
- 0.7% were cancelled, and 6% arrived an hour or more late.
- That ranks #2 of 2 airlines on this route, which averaged 77% on time overall.
- The largest source of delay minutes was late-arriving aircraft (55%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft55%
- Air traffic control & airport congestion29%
- Airline (crew, maintenance, cleaning, fueling)15%
- Extreme weather0%
- Security0%
Other airlines on ONT to LAS
- Frontier Airlines77% on time · 21 min avg delay
Full ONT to LAS comparison →
Southwest Airlines on-time record across all routes →
1,748 Southwest Airlines flights tracked on this route; 12 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.