CA · ONT
Cheap flights from Ontario
Round trips from $581 per traveler, taxes and fees included. 1 popular routes from Ontario with fares by month, airlines and the best day to fly.
Popular domestic routes from Ontario
Lowest round-trip fares over the next three months where we track them, per traveler with taxes and fees.
No curated domestic routes yet — search any US city above.
International flights from Ontario
Nonstop and one-stop routes to Mexico, the Caribbean, Europe and beyond.
Airports in Ontario
Flying from Ontario: common questions
Which airlines fly from Ontario?
Ontario is served by most major US airlines with nonstop and one-stop flights. Each route page lists the airlines flying that city pair.
What is the cheapest flight from Ontario?
Among the popular routes we track, the lowest round-trip fare from Ontario over the next three months is $581 per traveler including taxes and fees. Short domestic hops are usually the cheapest; see the deals page for the best dates.
How early should I get to ONT?
Arrive two hours before a domestic departure and three hours before an international one. TSA PreCheck members can usually cut that by 30 minutes at ONT.