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Ontario to San Francisco in November 2026 ONT → SFO

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

For departures in November 2026, the cheapest return found recently is $130 with Frontier Airlines, 15 Nov – 18 Nov, found yesterday. The cheapest one-way found recently is $51 with Frontier Airlines, 12 Nov, found today.

Return

In November 2026, the cheapest return fare on each of 6 departure dates is usually $104 to $193. Across all 14 departure dates we hold on this route, it is usually $111 to $253. Of the 2 months with enough return fares to compare, November 2026 is usually the cheapest.

Cheapest return found recently

$130

15 Nov – 18 Nov · Frontier Airlines

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

out nonstop, back nonstop

found yesterday

See prices for these datesCheck today's price

Cheapest we hold, of any age

$87

16 Nov – 19 Nov · Frontier Airlines

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

out nonstop, back nonstop

found 4 days ago

See prices for these datesCheck today's price

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The cheapest dates in November 2026

DatesFromAirlineStopsFound
16 Nov – 19 Nov$87Frontier Airlinesout nonstop, back nonstopfound 4 days agoSee prices for these dates
17 Nov – 19 Nov$103Frontier Airlinesout 1 stop, back nonstopfound 4 days agoSee prices for these dates
18 Nov – 18 Nov$105Frontier Airlinesout 1 stop, back nonstopfound 3 days agoSee prices for these dates
15 Nov – 18 Nov$130Frontier Airlinesout nonstop, back nonstopfound yesterdaySee prices for these dates
3 Nov – 5 Nov$214Frontier Airlinesout 1 stop, back nonstopfound yesterdaySee prices for these dates

Every date we hold

6 departure dates

3 Nov – 5 Nov: $214, found yesterday15 Nov – 18 Nov: $130, found yesterday16 Nov – 19 Nov: $87, found 4 days ago17 Nov – 19 Nov: $103, found 4 days ago18 Nov – 18 Nov: $105, found 3 days ago26 Nov – 30 Nov: $234, found 2 days agoNov
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
3 Nov – 5 Nov$214Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out 1 stop, back nonstopfound yesterdaySee prices for these dates
15 Nov – 18 Nov$130Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound yesterdaySee prices for these dates
16 Nov – 19 Nov$87Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 4 days agoSee prices for these dates
17 Nov – 19 Nov$103Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out 1 stop, back nonstopfound 4 days agoSee prices for these dates
18 Nov – 18 Nov$105Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out 1 stop, back nonstopfound 3 days agoSee prices for these dates
26 Nov – 30 Nov$234Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out 1 stop, back nonstopfound 2 days agoSee prices for these dates

Which month looks cheapest?

December 2026 is the cheapest month — from $29.

October 2026From $1695 departure dates30 Oct – 4 Nov · found 3 days agoSee prices for these dates
November 2026From $876 departure dates16 Nov – 19 Nov · found 4 days agoSee prices for these dates
December 2026From $29Cheapest seen1 departure date5 Dec – 9 Dec · found 4 days agoSee prices for these datesEvery date in December 2026
January 2027From $1321 departure date6 Jan 2027 – 7 Jan 2027 · found 2 days agoSee prices for these dates
March 2027From $3541 departure date20 Mar 2027 – 30 Mar 2027 · found 4 days agoSee prices for these dates

One-way

In November 2026, the cheapest one-way fare on each of 10 departure dates is usually $51 to $62. Across all 24 departure dates we hold on this route, it is usually $51 to $124. Of the 3 months with enough one-way fares to compare, 1 is usually cheaper than November 2026.

Cheapest one-way found recently

$51

12 Nov · Frontier Airlines

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

nonstop

found today

Open this tripCheck today's price

Cheapest we hold, of any age

$22

5 Nov · Frontier Airlines

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

nonstop

found 4 days ago

Open this tripCheck today's price

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The cheapest dates in November 2026

DatesFromAirlineStopsFound
5 Nov$22Frontier Airlinesnonstopfound 4 days agoOpen this trip
6 Nov$46Frontier Airlinesnonstopfound 3 days agoOpen this trip
12 Nov$51Frontier Airlinesnonstopfound todayOpen this trip
13 Nov$51Frontier Airlinesnonstopfound yesterdayOpen this trip
4 Nov$55Frontier Airlines1 stopfound 5 days agoOpen this trip

Every date we hold

10 departure dates

3 Nov: $58, found 6 days ago4 Nov: $55, found 5 days ago5 Nov: $22, found 4 days ago6 Nov: $46, found 3 days ago7 Nov: $59, found 6 days ago8 Nov: $95, found 3 days ago12 Nov: $51, found today13 Nov: $51, found yesterday14 Nov: $63, found 6 days ago25 Nov: $138, found 4 days agoNov
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
3 Nov$58United AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 6 days agoOpen this trip
4 Nov$55Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)1 stopfound 5 days agoOpen this trip
5 Nov$22Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 4 days agoOpen this trip
6 Nov$46Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 3 days agoOpen this trip
7 Nov$59United AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 6 days agoOpen this trip
8 Nov$95Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 3 days agoOpen this trip
12 Nov$51Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound todayOpen this trip
13 Nov$51Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound yesterdayOpen this trip
14 Nov$63United AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 6 days agoOpen this trip
25 Nov$138Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 4 days agoOpen this trip

Which month looks cheapest?

December 2026 is the cheapest month — from $21.

October 2026From $1072 departure dates26 Oct · found 5 days agoOpen this trip
November 2026From $2210 departure dates5 Nov · found 4 days agoOpen this trip
December 2026From $21Cheapest seen7 departure dates5 Dec · found todayOpen this tripEvery date in December 2026
January 2027From $1191 departure date4 Jan 2027 · found 2 days agoOpen this trip
February 2027From $621 departure date19 Feb 2027 · found 6 days agoOpen this trip
March 2027From $1573 departure dates28 Mar 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