Ontario to San Francisco ONT → SFO
Ontario International Airport (ONT) → San Francisco International Airport (SFO)
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
The cheapest return fare on each of 14 departure dates is usually $111 to $253.
Cheapest return found recently
$130
15 Nov – 18 Nov · Frontier Airlines
Ontario International Airport (ONT) → San Francisco International Airport (SFO)
Leaves 12:01 p.m. · Return leaves 9:27 p.m. · 3 h 2 min of travel, both ways together
out nonstop, back nonstop
found yesterday
Cheapest nonstop return
$130
15 Nov – 18 Nov · Frontier Airlines
Ontario International Airport (ONT) → San Francisco International Airport (SFO)
Leaves 12:01 p.m. · Return leaves 9:27 p.m. · 3 h 2 min of travel, both ways together
out nonstop, back nonstop
found yesterday
Every nonstop date from Ontario to San Francisco
Found recently, and the cheapest we hold
$130 15 Nov – 18 Novfound yesterdaySee prices for these dates
$29 5 Dec – 9 Decfound 4 days agoSee prices for these dates
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $29 to $70.
At $130, the cheapest return found recently is above that range.
25 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good return price?
Compared with the cheapest return fare on each of 14 departure dates from 22 Oct to 20 Mar 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
Yes. Among 3-night return fares leaving within 3 days of 15 Nov, 16 Nov – 19 Nov costs $87: $43 less than the cheapest found recently.
Frontier Airlines · Ontario International Airport (ONT) → San Francisco International Airport (SFO) · out nonstop, back nonstop · found 4 days ago
Every date we hold
20 fares on 14 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 22 Oct – 24 Oct | $322 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | out nonstop, back nonstop | found yesterday | See prices for these dates |
| 23 Oct – 28 Oct | $295 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | out nonstop, back nonstop | found yesterday | See prices for these dates |
| 28 Oct – 4 Nov | $224 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | out 1 stop, back nonstop | found yesterday | See prices for these dates |
| 30 Oct – 4 Nov | $169 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 31 Oct – 2 Nov | $259 | United Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | out nonstop, back nonstop | found 4 days ago | See prices for these dates |
| 3 Nov – 5 Nov | $214 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | out 1 stop, back nonstop | found yesterday | See prices for these dates |
| 15 Nov – 18 Nov | $130 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | out nonstop, back nonstop | found yesterday | See prices for these dates |
| 16 Nov – 19 Nov | $87 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | out nonstop, back nonstop | found 4 days ago | See prices for these dates |
| 17 Nov – 19 Nov | $103 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | out 1 stop, back nonstop | found 4 days ago | See prices for these dates |
| 18 Nov – 18 Nov | $105 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | out 1 stop, back nonstop | found 3 days ago | See prices for these dates |
| 26 Nov – 30 Nov | $234 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | out 1 stop, back nonstop | found 2 days ago | See prices for these dates |
| 5 Dec – 9 Dec | $29 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | out nonstop, back nonstop | found 4 days ago | See prices for these dates |
| 6 Jan 2027 – 7 Jan 2027 | $132 | Southwest Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | out 1 stop, back nonstop | found 2 days ago | See prices for these dates |
| 20 Mar 2027 – 30 Mar 2027 | $354 | United Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | out nonstop, back nonstop | found 4 days ago | See prices for these dates |
Which month looks cheapest?
December 2026 is the cheapest month — from $29.
Airlines on the cheapest dates: Frontier Airlines, United Airlines, Southwest Airlines.
One-way
The cheapest one-way fare on each of 24 departure dates is usually $51 to $124.
Cheapest one-way found recently
$51
12 Nov · Frontier Airlines
Ontario International Airport (ONT) → San Francisco International Airport (SFO)
Leaves 12:01 p.m. · 1 h 35 min trip
nonstop
found today
Cheapest nonstop one-way
$51
12 Nov · Frontier Airlines
Ontario International Airport (ONT) → San Francisco International Airport (SFO)
Leaves 12:01 p.m. · 1 h 35 min trip
nonstop
found today
Every nonstop date from Ontario to San Francisco
Found recently, and the cheapest we hold
$51 12 Novfound todayOpen this trip
$19 5 Decfound 6 days agoOpen this trip
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest one-way we saw each day was $19 to $25.
At $51, the cheapest one-way found recently is above that range.
25 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good one-way price?
Compared with the cheapest one-way fare on each of 24 departure dates from 26 Oct to 28 Mar 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
No. We hold one-way fares on 2 other departure dates within 3 days of 12 Nov, and none is cheaper.
Every date we hold
26 fares on 24 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 26 Oct | $107 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 5 days ago | Open this trip |
| 30 Oct | $114 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found today | Open this trip |
| 3 Nov | $58 | United Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 6 days ago | Open this trip |
| 4 Nov | $55 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | 1 stop | found 5 days ago | Open this trip |
| 5 Nov | $22 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 4 days ago | Open this trip |
| 6 Nov | $46 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 3 days ago | Open this trip |
| 7 Nov | $59 | United Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 6 days ago | Open this trip |
| 8 Nov | $95 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 3 days ago | Open this trip |
| 12 Nov | $51 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found today | Open this trip |
| 13 Nov | $51 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found yesterday | Open this trip |
| 14 Nov | $63 | United Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 6 days ago | Open this trip |
| 25 Nov | $138 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 4 days ago | Open this trip |
| 1 Dec | $54 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 5 days ago | Open this trip |
| 5 Dec | $19 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 6 days ago | Open this trip |
| 21 Dec | $42 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 2 days ago | Open this trip |
| 23 Dec | $54 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 2 days ago | Open this trip |
| 24 Dec | $28 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 6 days ago | Open this trip |
| 27 Dec | $200 | United Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 2 days ago | Open this trip |
| 28 Dec | $138 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found yesterday | Open this trip |
| 4 Jan 2027 | $119 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | 1 stop | found 2 days ago | Open this trip |
| 19 Feb 2027 | $62 | United Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 6 days ago | Open this trip |
| 13 Mar 2027 | $205 | United Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 4 days ago | Open this trip |
| 25 Mar 2027 | $207 | United Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 3 days ago | Open this trip |
| 28 Mar 2027 | $157 | Frontier Airlines | Ontario International Airport (ONT) → San Francisco International Airport (SFO) | nonstop | found 3 days ago | Open this trip |
Which month looks cheapest?
December 2026 is the cheapest month — from $19.
Airlines on the cheapest dates: Frontier Airlines, United Airlines.
Premium cabin fares from Ontario to San Francisco
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 15 Nov – 18 Nov in another cabin: Premium economy · Business · First
Today's prices for 12 Nov in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Ontario to San Francisco?
Return
Fares 30 to 59 days before departure were typically 70% lower than 0 to 6 days before departure.
From the cheapest return each day between 24 Sept and 18 Oct (25 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 0–6 days | $189 | $109 | +232% | 25 |
| 7–13 days | $189 | $109 | +232% | 25 |
| 14–29 days | $102 | $68 | +79% | 25 |
| 30–59 days | $57 | $29 | Cheapest seen | 25 |
| 60–89 days | $68 | $37 | +18% | 18 |
| 90–179 days | $142 | $93 | +149% | 25 |
| 180+ days | $321 | $321 | +463% | 8 |
One-way
Fares 60 to 89 days before departure were typically 78% lower than 0 to 6 days before departure.
From the cheapest one-way each day between 24 Sept and 18 Oct (25 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 0–6 days | $112 | $39 | +348% | 18 |
| 7–13 days | $90 | $36 | +260% | 24 |
| 14–29 days | $32 | $21 | +28% | 25 |
| 30–59 days | $31 | $19 | +24% | 25 |
| 60–89 days | $25 | $20 | Cheapest seen | 25 |
| 90–179 days | $48 | $35 | +92% | 25 |
| 180+ days | $204 | $195 | +716% | 19 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Los Angeles → San Francisco
56 km from Ontario
$87
$43 less than flying from Ontario
15 Nov – 18 Nov · LAX → SFO · out nonstop, back nonstop
found yesterday
Ontario → San Jose
67 km from San Francisco
$138
$8 more than flying to San Francisco
21 Nov – 27 Nov · ONT → SJC · out nonstop, back nonstop
found 3 days ago
Ontario → Sacramento
121 km from San Francisco
$272
$142 more than flying to San Francisco
24 Oct – 31 Oct · ONT → SMF · out 1 stop, back 1 stop
found 2 days ago
Palm Springs → San Francisco
104 km from Ontario
$382
$252 more than flying from Ontario
23 Oct – 26 Oct · PSP → SFO · out nonstop, back nonstop
found 6 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Los Angeles → San Francisco
56 km from Ontario
$19
$32 less than flying from Ontario
17 Nov · LAX → SFO · nonstop
found yesterday
Ontario → Oakland
13 km from San Francisco
$136
$85 more than flying to San Francisco
25 Nov · ONT → OAK · 1 stop
found yesterday
Ontario → San Jose
67 km from San Francisco
$139
$88 more than flying to San Francisco
18 Jan 2027 · ONT → SJC · nonstop
found 3 days ago
Palm Springs → San Francisco
104 km from Ontario
$148
$97 more than flying from Ontario
6 Nov · PSP → SFO · nonstop
found today
Ontario → Sacramento
121 km from San Francisco
$201
$150 more than flying to San Francisco
3 May 2027 · ONT → SMF · 1 stop
found yesterday
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 15 Nov – 18 Nov. A live search on this page shows what those dates cost now, for one adult in economy.
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