Ontario CA to Chicago O'Hare (ONT → ORD). We are tracking 12 fares on this route.
Cheapest tracked fare $85 · typical price $232 · you save about $147 (63%)
Cheapest fares we're tracking
Airline
Departs
Stops
Price
Frontier Airlines
2026-11-03
1 stop
$85
Frontier Airlines
2026-09-09
1 stop
$95
Frontier Airlines
2026-09-07
1 stop
$99
Frontier Airlines
2026-09-16
1 stop
$101
Frontier Airlines
2026-09-21
1 stop
$101
Frontier Airlines
2026-10-07
1 stop
$102
Frontier Airlines
2026-10-08
1 stop
$103
Frontier Airlines
2026-09-10
1 stop
$104
Frontier Airlines
2026-09-12
1 stop
$105
Frontier Airlines
2026-10-15
1 stop
$126
Frontier Airlines
2026-10-02
1 stop
$158
Frontier Airlines
2026-10-09
1 stop
$162
Could you save more?
The airport you were going to fly from is often not the cheapest one. Compare every airport in a region against each other, or check whether a multi-day stopover beats the direct fare.
How cheap can flights from Ontario CA to Chicago O'Hare get?
The cheapest fare we have tracked on this route is $85, compared with a typical $232 for a trip of this distance.
Is it cheaper to fly to Chicago O'Hare from a different airport?
Often, yes. Fares out of secondary airports are frequently cheaper than the obvious hub, but they are the ones most likely to be missing from a normal search. Our reverse search compares every airport in a region against each other so the cheaper departure point is not hidden.
Could a stopover make Ontario CA to Chicago O'Hare cheaper?
Sometimes. On thin long-haul routes a two-leg trip with a multi-day stopover can beat the direct fare, and occasionally a direct fare is not sold at all. Our detour search prices those routings against the direct flight.