ONT (Ontario) to SLC (Salt Lake City) flights arrive on time 92% of the time. The most reliable airline on this route is SkyWest Airlines at 93%. The average delay is 86 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated October 2026.ONT → SLC
ONT (Ontario) to SLC (Salt Lake City)
ONT → SLC on-time performance by month
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This route is usually on time. About 92% of flights arrive on schedule.
Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Accurate?
SkyWest Airlines is significantly more reliable on this route at 93% on time vs Frontier Airlines at 78%.
Airline Comparison
SkyWest Airlines leads at 93% on time; Frontier Airlines trails at 78%.
Accurate?
Good to know
Departing from ONT
81% on timeTSA is currently ~14 min. Best time: 4 AM (about 5 min).
Arriving at SLC
85% on timeWhen flights into SLC are late, the average delay is 70 minutes. Build buffer if you have ground plans.
If connecting at SLC: TSA is ~12 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what SkyWest Airlines owes you — refund rights, action plan, complaint email. Free.
Flying out of ONT? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated October 2026. Source: Bureau of Transportation Statistics.