San Francisco to Ontario flights
The cheapest round trip we found from San Francisco to Ontario is $68 (Dec 12 – 14, Nonstop), 53% below the usual $144.
SFO to ONT · Round trip · Economy · Prices per person in USD · Price found (22 minutes ago)
Cheapest found
Cheapest round trip by month
Lowest fare found per departure month| Month | Cheapest round trip |
|---|---|
| November 2026 | $187 |
| December 2026 | $68 (cheapest month) |
| January 2027 | $102 |
| February 2027 | No fares found yet |
| March 2027 | No fares found yet |
| April 2027 | $445 |
Cheapest dates in the next 4 months
Round trip, per person-
Dec 12 – 14 2 nights · leave Sat$68 −53% vs usual$68 −53% vs usual Book
Frontier Airlines Nonstop · 1h 27m -
Dec 14 – 18 4 nights · leave Mon$92 −36% vs usual$92 −36% vs usual Book
Frontier Airlines Nonstop · 1h 27m
-
Jan 3 – 10, 2027 7 nights · leave Sun$102 −29% vs usual$102 −29% vs usual Book
Frontier Airlines 1 stop · 2h 49m
-
Nov 25 – Dec 2 7 nights · leave Wed$187 +30% vs usual$187 +30% vs usual Book
Frontier Airlines Nonstop · 1h 25m
-
Nov 20 – 22 2 nights · leave Fri$195 +35% vs usual$195 +35% vs usual Book
Frontier Airlines Nonstop · 1h 25m
-
Jan 18 – 26, 2027 8 nights · leave Mon$205 +42% vs usual$205 +42% vs usual Book
Frontier Airlines 1 stop · 1h 28m
-
Jan 12 – 22, 2027 10 nights · leave Tue$225 +56% vs usual$225 +56% vs usual Book
United Airlines Nonstop · 1h 25m -
Nov 19 – 22 3 nights · leave Thu$246 +71% vs usual$246 +71% vs usual Book
Frontier Airlines Nonstop · 1h 26m
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 · Dec 12 – 14- 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
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San Francisco to Ontario: questions
How much does a flight from San Francisco to Ontario cost?
The cheapest round trip we have found right now is $68, leaving December 12 and returning December 14. The usual price on this route is about $144, so this fare is 53% less. Prices are per person, economy, in USD.
What is the cheapest month to fly from San Francisco to Ontario?
December 2026, with round trips from $68. The most expensive month in our data is April (from $445). Based on the 4 months ahead we have prices for.
Are there nonstop flights from San Francisco to Ontario?
Yes. Nonstop from $68 round trip. 80% of the 10 date combinations we track are nonstop.
Which airports do San Francisco to Ontario flights use?
San Francisco airports include San Francisco International (SFO). Ontario airports include Ontario International (ONT). The prices on this page cover every airport in both cities (SFO and ONT are the city codes).
About this route
We track round-trip economy fares from San Francisco (United States) to Ontario (United States) using Travelpayouts / Aviasales data. The cheapest round trip we've found is $68, departing December 12 and returning December 14 on a nonstop flight, about 53% below the usual $144. Right now we're following 10 upcoming date combinations on this route. The cheapest month to fly in our data is December, from $68. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.