Frontier Airlines SFO to ONT on-time performance
Frontier Airlines nonstop flights from San Francisco to Ontario · Aug 2025 – Jul 2026
On-time arrivals
56%
arrived < 15 min late
Cancelled
3.1%
6 flights
Avg arrival delay
42 min
94 min when late
Rank on route
#3 of 3
route average 76% on time
Key facts
- Frontier Airlines flights on SFO to ONT arrived on time 56% of the time in Aug 2025 – Jul 2026.
- 3.1% were cancelled, and 18% arrived an hour or more late.
- That ranks #3 of 3 airlines on this route, which averaged 76% on time overall.
- The largest source of delay minutes was late-arriving aircraft (70%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft70%
- Airline (crew, maintenance, cleaning, fueling)28%
- Air traffic control & airport congestion2%
- Extreme weather0%
- Security0%
Other airlines on SFO to ONT
- United Airlines81% on time · 11 min avg delay
- SkyWest Airlines68% on time · 24 min avg delay
Full SFO to ONT comparison →
Frontier Airlines on-time record across all routes →
196 Frontier 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.