Nonstop route
Oakland to Ontario nonstop
Yes — Southwest flies OAK to ONT nonstop year-round — about 4× daily.
OAKOakland
✈
ONTOntario
4× daily26.1 flights a week
Year-round26.1/wk Jun vs 26.9/wk Jan
$100–$225typical one-way · median $125
362miles nonstop
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Fares are what people actually paid: half of the 2,384 tickets in the US DOT fare survey for this route sold between $100 and $225 one way, median $125. That survey runs a couple of quarters behind, so treat it as the shape of the route's pricing rather than today's quote.
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