Cheap flights from Ontario to San Jose, California from $82 ONT → SJC

Found recently, and the cheapest we hold

What have prices looked like?

Over 49 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $84 to $181.

Those were the prices on those days, not today's.

Could nearby dates be cheaper?

We hold no other 0-night return fares leaving within 3 days of 3 Dec to compare.

Every date we hold

6 fares on 5 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $97.

Found recently, and the cheapest we hold

What have prices looked like?

Over 49 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $51 to $72.

At $82, the cheapest one-way found recently is above that range.

Those were the prices on those days, not today's.

Could nearby dates be cheaper?

We hold no other one-way fares leaving within 3 days of 11 Dec to compare.

Every date we hold

4 fares on 3 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $62.

Return

The cheapest fares were 14 to 29 days before departure.

From the cheapest return each day between 24 Sept and 11 Nov (49 days), grouped by how many days ahead the flight left; one adult in economy.

Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.

Prices reflect recent searches — current fares may differ.

One-way

The cheapest fares were 30 to 59 days before departure.

From the cheapest one-way each day between 24 Sept and 11 Nov (49 days), grouped by how many days ahead the flight left; one adult in economy.

Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.

Prices reflect recent searches — current fares may differ.

How much is a return flight from Ontario to San Jose?

The cheapest return found recently is $156 with Southwest Airlines, 3 Dec to 3 Dec, found 3 days ago. The cheapest return we hold, of any age, is $97 with Southwest Airlines, 29 Dec to 4 Jan 2027, found 6 days ago. The cheapest return fare on each of 5 departure dates is usually $128 to $168.

How much is a one-way flight from Ontario to San Jose?

The cheapest one-way found recently is $82 with Frontier Airlines, 11 Dec, found 2 days ago. The cheapest one-way we hold, of any age, is $62 with Southwest Airlines, 29 Dec, found 3 days ago. The cheapest one-way fare on each of 3 departure dates is usually $67 to $77.

What is the cheapest month to fly from Ontario to San Jose?

December 2026 is the cheapest month for a return, from $97, 29 Dec to 4 Jan 2027, found 6 days ago. It is the cheapest month for a one-way too, from $62, 29 Dec, found 3 days ago.

How far ahead should I book a flight from Ontario to San Jose?

In 49 days of prices between 24 Sept and 11 Nov, return fares were cheapest 14 to 29 days before departure. One-way fares were cheapest 30 to 59 days before departure.

Is there a direct flight from Ontario to San Jose?

Yes, the cheapest nonstop return found recently is $156 with Southwest Airlines, 3 Dec to 3 Dec, found 3 days ago. The cheapest nonstop one-way found recently is $62 with Southwest Airlines, 29 Dec, found 3 days ago.

How long is the flight from Ontario to San Jose?

The cheapest nonstop one-way found recently, with Southwest Airlines on 29 Dec, takes 1 h 10 min from Ontario International Airport (ONT) to Norman Y. Mineta San Jose International Airport (SJC). The cheapest one-way found recently, with Frontier Airlines on 11 Dec, takes 4 h 3 min with 1 stop.

Which airlines have the cheapest flights from Ontario to San Jose?

Between 3 Dec and 1 Mar 2027, Southwest Airlines has the cheapest return on all 5 departure dates we hold. Between 11 Dec and 18 Jan 2027, Frontier Airlines has the cheapest one-way on 2 of the 3 departure dates we hold, and Southwest Airlines on 1.