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Ontario to San Francisco flights in November 2026 from $186 ONT → SFO

Ontario International Airport (ONT) → San Francisco International Airport (SFO)

For departures in November 2026, the cheapest return found recently is $209 with Frontier Airlines, 21 Nov – 23 Nov, found 2 days ago. The cheapest one-way found recently is $186 with Frontier Airlines, 29 Nov, found 3 days ago.

Return

In November 2026, the cheapest return fare on each of 8 departure dates is usually $215 to $293. Across all 17 departure dates we hold on this route, it is usually $71 to $286. Of the 2 months with enough return fares to compare, November 2026 is usually the most expensive.

Cheapest return found recently

$209

21 Nov – 23 Nov · Frontier Airlines

Ontario International Airport (ONT) → San Francisco International Airport (SFO)

out nonstop, back nonstop

found 2 days ago

See prices for these datesCheck today's price

Cheapest we hold, of any age

$184

30 Nov – 3 Dec · Frontier Airlines

Ontario International Airport (ONT) → San Francisco International Airport (SFO)

out 1 stop, back nonstop

found 3 days ago

See prices for these datesCheck today's price

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The cheapest dates in November 2026

DatesFromAirlineStopsFound
30 Nov – 3 Dec$184Frontier Airlinesout 1 stop, back nonstopfound 3 days agoSee prices for these dates
21 Nov – 23 Nov$209Frontier Airlinesout nonstop, back nonstopfound 2 days agoSee prices for these dates
15 Nov – 16 Nov$217Frontier Airlinesout 1 stop, back nonstopfound 6 days agoSee prices for these dates
13 Nov – 15 Nov$235Frontier Airlinesout nonstop, back nonstopfound 6 days agoSee prices for these dates
19 Nov – 28 Nov$236Frontier Airlinesout nonstop, back nonstopfound 5 days agoSee prices for these dates

Every date we hold

8 departure dates

13 Nov – 15 Nov: $235, found 6 days ago14 Nov – 17 Nov: $286, found 2 days ago15 Nov – 16 Nov: $217, found 6 days ago19 Nov – 28 Nov: $236, found 5 days ago21 Nov – 23 Nov: $209, found 2 days ago23 Nov – 29 Nov: $341, found 6 days ago24 Nov – 29 Nov: $314, found 6 days ago30 Nov – 3 Dec: $184, found 3 days agoNov
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
13 Nov – 15 Nov$235Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 6 days agoSee prices for these dates
14 Nov – 17 Nov$286Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out 1 stop, back nonstopfound 2 days agoSee prices for these dates
15 Nov – 16 Nov$217Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out 1 stop, back nonstopfound 6 days agoSee prices for these dates
19 Nov – 28 Nov$236Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 5 days agoSee prices for these dates
21 Nov – 23 Nov$209Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 2 days agoSee prices for these dates
23 Nov – 29 Nov$341Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 6 days agoSee prices for these dates
24 Nov – 29 Nov$314Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out 1 stop, back nonstopfound 6 days agoSee prices for these dates
30 Nov – 3 Dec$184Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out 1 stop, back nonstopfound 3 days agoSee prices for these dates

Which month looks cheapest?

December 2026 is the cheapest month — from $32.

November 2026From $1848 departure dates30 Nov – 3 Dec · found 3 days agoSee prices for these dates
December 2026From $32Cheapest seen6 departure dates5 Dec – 9 Dec · found 8 days agoSee prices for these dates
January 2027From $841 departure date21 Jan 2027 – 26 Jan 2027 · found 8 days agoSee prices for these dates
April 2027From $4301 departure date1 Apr 2027 – 4 Apr 2027 · found 6 days agoSee prices for these dates
October 2027From $4471 departure date1 Oct 2027 – 4 Oct 2027 · found 6 days agoSee prices for these dates

One-way

We hold one-way fares on only 1 departure date in November 2026, too few to say what one usually costs.

Cheapest one-way found recently

$186

29 Nov · Frontier Airlines

Ontario International Airport (ONT) → San Francisco International Airport (SFO)

nonstop

found 3 days ago

Open this tripCheck today's price

It is also the cheapest one-way we hold, of any age.

FareTell may earn a commission when you book through a partner.

The cheapest dates in November 2026

DatesFromAirlineStopsFound
29 Nov$186Frontier Airlinesnonstopfound 3 days agoOpen this trip

Every date we hold

1 departure date

See every date as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
29 Nov$186Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 3 days agoOpen this trip

Which month looks cheapest?

December 2026 is the cheapest month — from $19.

November 2026From $1861 departure date29 Nov · found 3 days agoOpen this trip
December 2026From $19Cheapest seen5 departure dates5 Dec · found 2 days agoOpen this trip
January 2027From $372 departure dates7 Jan 2027 · found 4 days agoOpen this trip
February 2027From $473 departure dates14 Feb 2027 · found 6 days agoOpen this trip
March 2027From $671 departure date9 Mar 2027 · found 2 days agoOpen this trip
May 2027From $1971 departure date5 May 2027 · found 5 days agoOpen this trip
June 2027From $2192 departure dates15 Jun 2027 · found 6 days agoOpen this trip
July 2027From $2511 departure date22 Jul 2027 · found 3 days agoOpen this trip

Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work