Southwest Airlines LAS to ONT on-time performance
Southwest Airlines nonstop flights from Las Vegas to Ontario · Aug 2025 – Jul 2026
On-time arrivals
73%
arrived < 15 min late
Cancelled
0.6%
11 flights
Avg arrival delay
14 min
48 min when late
Rank on route
#2 of 2
route average 76% on time
Key facts
- Southwest Airlines flights on LAS to ONT arrived on time 73% of the time in Aug 2025 – Jul 2026.
- 0.6% were cancelled, and 7% arrived an hour or more late.
- That ranks #2 of 2 airlines on this route, which averaged 76% 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)32%
- Air traffic control & airport congestion6%
- Extreme weather1%
- Security1%
Other airlines on LAS to ONT
- Frontier Airlines82% on time · 15 min avg delay
Full LAS to ONT comparison →
Southwest Airlines on-time record across all routes →
1,749 Southwest Airlines flights tracked on this route; 11 cancelled, 1 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.