Ontario to San Francisco flights
The cheapest round trip we found from Ontario to San Francisco is $47 (Dec 2 – 4, Nonstop), 63% below the usual $128.
ONT to SFO · Round trip · Economy · Prices per person in USD · Price found (3 days ago)
Cheapest found
Cheapest round trip by month
Lowest fare found per departure month| Month | Cheapest round trip |
|---|---|
| November 2026 | $48 |
| December 2026 | $32 (cheapest month) |
Cheapest dates in the next 4 months
Round trip, per person-
Dec 2 – 4 2 nights · leave Wed$47 −63% vs usual$47 −63% vs usual Book
Frontier Airlines Nonstop · 1h 34m -
Nov 20 – 27 7 nights · leave Fri$48 −63% vs usual$48 −63% vs usual Book
Frontier Airlines Nonstop · 1h 33m
-
Nov 23 – 27 4 nights · leave Mon$86 −33% vs usual$86 −33% vs usual Book
Frontier Airlines 1 stop · 2h 56m
-
Nov 19 – 23 4 nights · leave Thu$128$128 Book
Frontier Airlines 1 stop · 2h 57m
-
Nov 16 – 18 2 nights · leave Mon$158 +23% vs usual$158 +23% vs usual Book
Frontier Airlines Nonstop · 1h 35m
-
Nov 26 – 29 3 nights · leave Thu$179 +40% vs usual$179 +40% vs usual Book
Frontier Airlines 1 stop · 5h 12m
-
Nov 15 – 18 3 nights · leave Sun$227 +77% vs usual$227 +77% vs usual Book
Frontier Airlines Nonstop · 1h 35m
-
Nov 29 – Dec 1 2 nights · leave Sun$233 +82% vs usual$233 +82% vs usual Book
Frontier Airlines Nonstop · 1h 33m
Prices change often. The booking site shows the final price before you pay. Other dates? Set an alert
Things to do in San Francisco
One Go City pass for Golden Gate Bay Cruise, Exploratorium, Filoli and more
- All-Inclusive Pass Unlimited Visit as many attractions as you like for 1–5 days from $109 See pass
- Explorer Pass Pick 2–5 of 25 attractions from $89 See pass
- Essentials Pass A few top attractions, chosen as you go from $74 See pass
Go City prices checked Oct 23, 2026; the final price is on Go City. Partner links: we may earn a commission if you book, at no extra cost to you.
Plan the rest of your trip
San Francisco · Dec 2 – 4Partner links: we may earn a commission if you book, at no extra cost to you.
Good to know
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Flights to San Francisco from other cities
All flights to San Francisco Flying the other way? San Francisco to Ontario from $34
Ontario to San Francisco: questions
How much does a flight from Ontario to San Francisco cost?
The cheapest round trip we have found right now is $47, leaving December 2 and returning December 4. The usual price on this route is about $128, so this fare is 63% less. Prices are per person, economy, in USD.
Are there nonstop flights from Ontario to San Francisco?
Yes. Nonstop from $47 round trip. 73% of the 11 date combinations we track are nonstop.
Which airports do Ontario to San Francisco flights use?
Ontario airports include Ontario International (ONT). San Francisco airports include San Francisco International (SFO). The prices on this page cover every airport in both cities (ONT and SFO are the city codes).
About this route
We track round-trip economy fares from Ontario (United States) to San Francisco (United States) using Travelpayouts / Aviasales data. The cheapest round trip we've found is $47, departing December 2 and returning December 4 on a nonstop flight, about 63% below the usual $128. Right now we're following 11 upcoming date combinations on this route. The cheapest month to fly in our data is December, from $32. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.