Southwest Airlines ONT to AUS on-time performance
Southwest Airlines nonstop flights from Ontario to Austin · Aug 2025 – Jul 2026
On-time arrivals
75%
arrived < 15 min late
Cancelled
0.3%
1 flights
Avg arrival delay
12 min
40 min when late
Rank on route
#1 of 2
route average 74% on time
Key facts
- Southwest Airlines flights on ONT to AUS arrived on time 75% of the time in Aug 2025 – Jul 2026.
- 0.3% were cancelled, and 4% arrived an hour or more late.
- That ranks #1 of 2 airlines on this route, which averaged 74% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (36%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion36%
- Late-arriving aircraft33%
- Airline (crew, maintenance, cleaning, fueling)29%
- Extreme weather2%
- Security0%
Other airlines on ONT to AUS
- SkyWest Airlines0% on time · 75 min avg delay
Full ONT to AUS comparison →
Southwest Airlines on-time record across all routes →
336 Southwest Airlines flights tracked on this route; 1 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.