Frontier Airlines ONT to SFO on-time performance
Frontier Airlines nonstop flights from Ontario to San Francisco · Aug 2025 – Jul 2026
On-time arrivals
39%
arrived < 15 min late
Cancelled
2.6%
5 flights
Avg arrival delay
43 min
68 min when late
Rank on route
#3 of 3
route average 62% on time
Key facts
- Frontier Airlines flights on ONT to SFO arrived on time 39% of the time in Aug 2025 – Jul 2026.
- 2.6% were cancelled, and 25% arrived an hour or more late.
- That ranks #3 of 3 airlines on this route, which averaged 62% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (63%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion63%
- Late-arriving aircraft33%
- Airline (crew, maintenance, cleaning, fueling)4%
- Extreme weather0%
- Security0%
Other airlines on ONT to SFO
- United Airlines69% on time · 21 min avg delay
- SkyWest Airlines42% on time · 37 min avg delay
Full ONT to SFO comparison →
Frontier Airlines on-time record across all routes →
196 Frontier Airlines flights tracked on this route; 5 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.