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Nonstop flights from Ontario to San Francisco from $19 ONT → SFO

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

The cheapest nonstop return found recently is $38 with Frontier Airlines, 5 Dec – 8 Dec, found yesterday.

Nonstop return

The cheapest nonstop return fare on each of 14 departure dates is usually $70 to $248.

Cheapest nonstop return

$38

5 Dec – 8 Dec · Frontier Airlines

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

Leaves 7:26 p.m. · Return leaves 11:23 p.m. · 3 h 2 min of travel, both ways together

out nonstop, back nonstop

found yesterday

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Airlines flying it nonstop on the return fares we hold: Frontier Airlines (12 departure dates), United Airlines (12 departure dates), Alaska Airlines (8 departure dates), American Airlines (3 departure dates), Southwest Airlines (3 departure dates).

On the 16 trips where we hold both on the same dates, nonstop cost a median $35 (22.1%) less than the cheapest fare with stops. Nonstop was cheaper or the same price on 15 of those 16 trips.

Every nonstop date we hold

Nonstop fares on 14 of the 17 departure dates we hold for this route.

13 Nov – 15 Nov: $235, 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 ago30 Nov – 3 Dec: $185, found 3 days ago1 Dec – 3 Dec: $252, found 2 days ago2 Dec – 4 Dec: $50, found 7 days ago5 Dec – 9 Dec: $32, found 8 days ago7 Dec – 10 Dec: $71, found 4 days ago10 Dec – 13 Dec: $69, found 6 days ago21 Dec – 29 Dec: $60, found 7 days ago21 Jan 2027 – 26 Jan 2027: $84, found 8 days ago1 Apr 2027 – 4 Apr 2027: $430, found 6 days ago1 Oct 2027 – 4 Oct 2027: $447, found 6 days agoNovDecJanAprOct
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
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
30 Nov – 3 Dec$185Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 3 days agoSee prices for these dates
1 Dec – 3 Dec$252United AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 2 days agoSee prices for these dates
2 Dec – 4 Dec$50Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 7 days agoSee prices for these dates
5 Dec – 9 Dec$32Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 8 days agoSee prices for these dates
7 Dec – 10 Dec$71Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 4 days agoSee prices for these dates
10 Dec – 13 Dec$69Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 6 days agoSee prices for these dates
21 Dec – 29 Dec$60Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 7 days agoSee prices for these dates
21 Jan 2027 – 26 Jan 2027$84United AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 8 days agoSee prices for these dates
1 Apr 2027 – 4 Apr 2027$430United AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 6 days agoSee prices for these dates
1 Oct 2027 – 4 Oct 2027$447United AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)out nonstop, back nonstopfound 6 days agoSee prices for these dates

Nonstop one-way

The cheapest nonstop one-way fare on each of 12 departure dates is usually $33 to $132.

Cheapest nonstop one-way

$19

5 Dec · Frontier Airlines

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

Leaves 7:26 p.m. · 1 h 35 min trip

nonstop

found 2 days ago

Open this tripCheck today's price

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Airlines flying it nonstop on the one-way fares we hold: Frontier Airlines (8 departure dates), United Airlines (4 departure dates).

We hold too few one-way trips with both a nonstop fare and a fare with stops on the same dates to compare the two.

Every nonstop date we hold

Nonstop fares on 12 of the 16 departure dates we hold for this route.

29 Nov: $186, found 3 days ago5 Dec: $19, found 2 days ago8 Dec: $20, found 5 days ago9 Dec: $21, found 2 days ago13 Dec: $48, found 7 days ago22 Dec: $66, found 3 days ago7 Jan 2027: $37, found 4 days ago14 Feb 2027: $47, found 6 days ago16 Feb 2027: $113, found 5 days ago18 Feb 2027: $48, found 5 days ago9 Jun 2027: $226, found 6 days ago15 Jun 2027: $219, found 6 days agoNovDecJanFebJun
See the chart 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
5 Dec$19Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 2 days agoOpen this trip
8 Dec$20Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 5 days agoOpen this trip
9 Dec$21Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 2 days agoOpen this trip
13 Dec$48Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 7 days agoOpen this trip
22 Dec$66United AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 3 days agoOpen this trip
7 Jan 2027$37Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 4 days agoOpen this trip
14 Feb 2027$47Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 6 days agoOpen this trip
16 Feb 2027$113United AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 5 days agoOpen this trip
18 Feb 2027$48Frontier AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 5 days agoOpen this trip
9 Jun 2027$226United AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 6 days agoOpen this trip
15 Jun 2027$219United AirlinesOntario International Airport (ONT) → San Francisco International Airport (SFO)nonstopfound 6 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