San Francisco to Ontario flights
Round trip · Economy · Prices per person in USD
Prices updated
Prices are low right now
$53 is $71 (57%) below the usual $124 for San Francisco → Ontario.
Buy now or wait? We're still learning this route. We have 1 day of prices so far and need about a week to say whether to book or wait.
Not ready to book? Get an email when San Francisco → Ontario drops below your price.Cheapest round trip by month
Lowest fare found per departure month| Month | Cheapest round trip |
|---|---|
| September 2026 | No fares found yet |
| October 2026 | $81 |
| November 2026 | $53 (cheapest month) |
| December 2026 | $166 |
| January 2027 | No fares found yet |
| February 2027 | No fares found yet |
| March 2027 | $264 |
Cheapest dates in the next 4 months
Round trip, per person-
Nov 6 – 9 3 nights · leave Fri$53 −57% vs usual$53 −57% vs usual Book
Frontier Airlines Nonstop · 1h 26m -
Oct 31 – Nov 5 5 nights · leave Sat$81 −35% vs usual$81 −35% vs usual Book
Frontier Airlines 1 stop · 5h 01m
-
Oct 19 – 30 11 nights · leave Mon$86 −31% vs usual$86 −31% vs usual Book
Frontier Airlines Nonstop · 1h 38m
-
Oct 27 – 29 2 nights · leave Tue$88 −29% vs usual$88 −29% vs usual Book
United Airlines Nonstop · 1h 26m -
Nov 3 – 5 2 nights · leave Tue$88 −29% vs usual$88 −29% vs usual Book
United Airlines Nonstop · 1h 25m
-
Nov 7 – 9 2 nights · leave Sat$88 −29% vs usual$88 −29% vs usual Book
United Airlines Nonstop · 1h 25m
-
Oct 23 – 26 3 nights · leave Fri$117 −6% vs usual$117 −6% vs usual Book
Frontier Airlines Nonstop · 1h 38m
-
Oct 30 – Nov 1 2 nights · leave Fri$121$121 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 · Nov 6 – 9Travel insurance · EKTA Airport transfer · Kiwitaxi
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San Francisco to Ontario: questions
How much is a flight from San Francisco to Ontario?
The cheapest round trip we have found right now is $53, leaving November 6 and returning November 9. The usual price on this route is about $124, so this fare is 57% less. Prices are per person, economy, in USD.
What is the cheapest month to fly from San Francisco to Ontario?
November 2026, with round trips from $53. The most expensive month in our data is March (from $264). Based on the 4 months ahead we have prices for.
Are there nonstop flights from San Francisco to Ontario?
Yes. Nonstop from $53 round trip. 96% of the 23 date combinations we track are nonstop.
What is the cheapest day to fly from San Francisco to Ontario?
Leaving on a Friday. Typical fare $126, vs $166 across all days.
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 $53, departing November 6 and returning November 9 on a nonstop flight, about 57% below the usual $124. Right now we're following 23 upcoming date combinations on this route. The cheapest month to fly in our data is November, from $53. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.