Ontario CA to Boston (ONT → BOS). We are tracking 5 fares on this route.
Cheapest tracked fare $139 · typical price $310 · you save about $171 (55%)
Cheapest fares we're tracking
Airline
Departs
Stops
Price
—
2026-10-19
1 stop
$139
—
2026-09-29
1 stop
$179
Southwest Airlines
2026-10-11
2 stops
$182
—
2027-01-10
1 stop
$184
Southwest Airlines
2026-12-21
1 stop
$203
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 Boston get?
The cheapest fare we have tracked on this route is $139, compared with a typical $310 for a trip of this distance.
Is it cheaper to fly to Boston 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 Boston 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.