San Jose to Ontario flights
The cheapest round trip we found from San Jose to Ontario is $89 (Jan 7 – 9, 2027, Nonstop), 3% below the usual $92.
SJC to ONT · Round trip · Economy · Prices per person in USD · Price found (1 day ago)
Cheapest found
Cheapest round trip by month
Lowest fare found per departure month| Month | Cheapest round trip |
|---|---|
| November 2026 | $95 |
| December 2026 | $89 (cheapest month) |
| January 2027 | $89 (cheapest month) |
| February 2027 | No fares found yet |
| March 2027 | $123 |
Cheapest dates in the next 4 months
Round trip, per person-
Jan 7 – 9, 2027 2 nights · leave Thu$89$89 Book
Southwest Airlines Nonstop · 1h 15m -
Jan 18 – 26, 2027 8 nights · leave Mon$91$91 Book
Southwest Airlines Nonstop · 1h 15m
-
Dec 2 – 4 2 nights · leave Wed$92$92 Book
Southwest Airlines Nonstop · 1h 15m
-
Nov 26 – Dec 3 7 nights · leave Thu$95$95 Book
Southwest Airlines Nonstop · 1h 15m
-
Dec 4 – 6 2 nights · leave Fri$118 +28% vs usual$118 +28% vs usual Book
Southwest Airlines Nonstop · 1h 15m
-
Nov 25 – 29 4 nights · leave Wed$273 +197% vs usual$273 +197% vs usual Book
Southwest Airlines Nonstop · 1h 20m
-
Nov 16 – 22 6 nights · leave Mon$339 +268% vs usual$339 +268% vs usual Book
Frontier Airlines 1 stop · 2h 38m
Prices change often. The booking site shows the final price before you pay. Other dates? Set an alert
Plan the rest of your trip
Ontario · Jan 7 – 9, 2027- Car rental Economybookings · compare rental companies (opens Economybookings in a new tab)
- Things to do in Ontario Klook · tours and tickets (opens Klook in a new tab)
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Good to know
More from San Jose
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- Long Beach $89 −18%
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Flights to Ontario from other cities
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San Jose to Ontario: questions
How much does a flight from San Jose to Ontario cost?
The cheapest round trip we have found right now is $89, leaving January 7 and returning January 9. The usual price on this route is about $92, so this fare is 3% less. Prices are per person, economy, in USD.
What is the cheapest month to fly from San Jose to Ontario?
December 2026, with round trips from $89. The most expensive month in our data is March (from $123). Based on the 4 months ahead we have prices for.
Which airports do San Jose to Ontario flights use?
San Jose airports include Norman Y. Mineta San Jose International (SJC). Ontario airports include Ontario International (ONT). The prices on this page cover every airport in both cities (SJC and ONT are the city codes).
About this route
We track round-trip economy fares from San Jose (United States) to Ontario (United States) using Travelpayouts / Aviasales data. The cheapest round trip we've found is $89, departing January 7 and returning January 9 on a nonstop flight, about 3% below the usual $92. Right now we're following 7 upcoming date combinations on this route. The cheapest month to fly in our data is December, from $89. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.