Cheap flights to Ontario
Round trips from 9 cities to Ontario, United States, from $34. Economy, per person, in USD.
Prices updated
Flights to Ontario by departure city
Cheapest round trip, per person-
San Francisco → Ontario
Jan 18 – 26, 2027 · Nonstop
$34
-
San Jose → Ontario
Jan 7 – 9, 2027 · Nonstop
$89
-
Oakland → Ontario
Jan 7 – 9, 2027 · Nonstop
$101
-
Austin → Ontario
Feb 6 – 8, 2027 · 1 stop
$171
-
Seattle → Ontario
Dec 11 – 15 · 1 stop
$179
-
Houston → Ontario
Dec 11 – 13 · 1 stop
$199
-
Minneapolis → Ontario
Nov 25 – Dec 2 · 1 stop
$261
-
Portland → Ontario
Nov 6 – 8 · 1 stop
$285
-
New York → Ontario
Jan 13 – 20, 2027 · 1 stop
$311
Cheapest month to fly to Ontario
Lowest round trip per departure month, any of our cities| Month | Cheapest round trip |
|---|---|
| November 2026 | $78 from San Francisco |
| December 2026 | $42 from San Francisco |
| January 2027 | $34 from San Francisco (cheapest month) |
| February 2027 | $171 from Austin |
| March 2027 | $123 from San Jose |
| April 2027 | $342 from New York |
| May 2027 | $389 from New York |
| June 2027 | $533 from New York |
| July 2027 | $492 from Minneapolis |
| August 2027 | $473 from Minneapolis |
Cheapest dates to Ontario
Best date pair from each city-
Jan 18 – 26, 2027 from San Francisco · 8 nights$34Book
Frontier Airlines Nonstop -
Jan 7 – 9, 2027 from San Jose · 2 nights$89Book
Southwest Airlines Nonstop -
Jan 7 – 9, 2027 from Oakland · 2 nights$101Book
Southwest Airlines Nonstop
-
Feb 6 – 8, 2027 from Austin · 2 nights$171Book
Frontier Airlines 1 stop
-
Dec 11 – 15 from Seattle · 4 nights$179Book
Frontier Airlines 1 stop
-
Dec 11 – 13 from Houston · 2 nights$199Book
Frontier Airlines 1 stop
-
Nov 25 – Dec 2 from Minneapolis · 7 nights$261Book
Frontier Airlines 1 stop
-
Nov 6 – 8 from Portland · 2 nights$285Book
Frontier Airlines 1 stop
Prices change often. The booking site shows the final price before you pay.
Flights to Ontario: questions
Which city has the cheapest flights to Ontario?
Right now it's San Francisco: round trips from $34 (Jan 18 – 26, 2027, nonstop). Next cheapest: San Jose from $89 and Oakland from $101. We compare 9 departure cities.
What is the cheapest month to fly to Ontario?
January 2027: the cheapest round trip we have found departing that month is $34. The most expensive month in our data is June, where the cheapest round trip is $533. Based on the 10 months ahead we track.
Are there nonstop flights to Ontario?
Yes. We have found nonstop round trips from San Francisco, San Jose, Oakland and Seattle. The cheapest is $34 from San Francisco.
More of United States
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Popular destinations
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About these prices
We track round-trip economy fares to Ontario (United States) from the cities listed above using Travelpayouts / Aviasales data, and refresh every route about once a day. The cheapest round trip we've found is $34 from San Francisco. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.