SkyWest Airlines ONT to SFO on-time performance
SkyWest Airlines nonstop flights from Ontario to San Francisco · Aug 2025 – Jul 2026Regional airline operating flights for United Express, Delta Connection, American Eagle and Alaska.
On-time arrivals
42%
arrived < 15 min late
Cancelled
1.5%
2 flights
Avg arrival delay
37 min
61 min when late
Rank on route
#2 of 3
route average 62% on time
Key facts
- SkyWest Airlines flights on ONT to SFO arrived on time 42% of the time in Aug 2025 – Jul 2026.
- 1.5% were cancelled, and 21% arrived an hour or more late.
- That ranks #2 of 3 airlines on this route, which averaged 62% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (57%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion57%
- Late-arriving aircraft20%
- Airline (crew, maintenance, cleaning, fueling)13%
- Extreme weather11%
- Security0%
Other airlines on ONT to SFO
- United Airlines69% on time · 21 min avg delay
- Frontier Airlines39% on time · 43 min avg delay
Full ONT to SFO comparison →
SkyWest Airlines on-time record across all routes →
132 SkyWest Airlines flights tracked on this route; 2 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.