SkyWest Airlines SEA to ONT on-time performance
SkyWest Airlines nonstop flights from Seattle to Ontario · Aug 2025 – Jul 2026Regional airline operating flights for United Express, Delta Connection, American Eagle and Alaska.
On-time arrivals
89%
arrived < 15 min late
Cancelled
0.4%
4 flights
Avg arrival delay
7 min
50 min when late
Rank on route
#2 of 4
route average 83% on time
Key facts
- SkyWest Airlines flights on SEA to ONT arrived on time 89% of the time in Aug 2025 – Jul 2026.
- 0.4% were cancelled, and 2% arrived an hour or more late.
- That ranks #2 of 4 airlines on this route, which averaged 83% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (63%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)63%
- Extreme weather24%
- Air traffic control & airport congestion13%
- Late-arriving aircraft0%
- Security0%
Other airlines on SEA to ONT
- Alaska Airlines77% on time · 12 min avg delay
- Frontier Airlines84% on time · 12 min avg delay
- Delta Air Lines93% on time · 3 min avg delay
Full SEA to ONT comparison →
SkyWest Airlines on-time record across all routes →
1,047 SkyWest Airlines flights tracked on this route; 4 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.