FFL Helper
Ontario ONT
$159
STL → ONT · Frontier Airlines
FFL Helper / St Louis / Ontario
STL → ONT
St Louis (STL) to Ontario (ONT)
Compare one-way fares for flights from St Louis to Ontario.
Lowest fare
$159
Distance
1,554 mi
Flight time
20h 26m
Airports
STL–ONT
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By month: December 2026 from $159
Price calendar
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Upcoming dates
About this route
This calendar shows dated one-way fares from St Louis to Ontario. Use it to see which days are cheaper before you search tickets.
Flight time and airport codes on this page are for the sample itinerary we have on file. Always confirm the live routing when you book St Louis to Ontario.