Ontario to San Jose ONT → SJC
Ontario International Airport (ONT) → Norman Y. Mineta San Jose International Airport (SJC)
The cheapest return found recently is $138 with Southwest Airlines, 21 Nov – 27 Nov, found 3 days ago. The cheapest one-way found recently is $139 with Southwest Airlines, 18 Jan 2027, found 3 days ago.
Return
Not enough comparable prices yet for a usual return price.
Cheapest return found recently
$138
21 Nov – 27 Nov · Southwest Airlines
Ontario International Airport (ONT) → Norman Y. Mineta San Jose International Airport (SJC)
Leaves 6:00 a.m. · Return leaves 6:10 p.m. · 2 h 30 min of travel, both ways together
out nonstop, back nonstop
found 3 days ago
Cheapest nonstop return
$138
21 Nov – 27 Nov · Southwest Airlines
Ontario International Airport (ONT) → Norman Y. Mineta San Jose International Airport (SJC)
Leaves 6:00 a.m. · Return leaves 6:10 p.m. · 2 h 30 min of travel, both ways together
out nonstop, back nonstop
found 3 days ago
Found recently, and the cheapest we hold
$138 21 Nov – 27 Novfound 3 days agoSee prices for these dates
$133 8 Jan 2027 – 9 Jan 2027found 6 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 $84 to $126.
At $138, 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?
Not enough comparable prices yet: we hold return fares on 2 departure dates and need at least 3 to say what is usual.
Could nearby dates be cheaper?
We hold no other 6-night return fares leaving within 3 days of 21 Nov to compare.
Every date we hold
2 fares on 2 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 21 Nov – 27 Nov | $138 | Southwest Airlines | Ontario International Airport (ONT) → Norman Y. Mineta San Jose International Airport (SJC) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 8 Jan 2027 – 9 Jan 2027 | $133 | Southwest Airlines | Ontario International Airport (ONT) → Norman Y. Mineta San Jose International Airport (SJC) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
Which month looks cheapest?
January 2027 is the cheapest month — from $133.
Airlines on the cheapest dates: Southwest Airlines.
One-way
The cheapest one-way fare on each of 4 departure dates is usually $54 to $87.
Cheapest one-way found recently
$139
18 Jan 2027 · Southwest Airlines
Ontario International Airport (ONT) → Norman Y. Mineta San Jose International Airport (SJC)
Leaves 6:45 a.m. · 1 h 15 min trip
nonstop
found 3 days ago
Cheapest nonstop one-way
$139
18 Jan 2027 · Southwest Airlines
Ontario International Airport (ONT) → Norman Y. Mineta San Jose International Airport (SJC)
Leaves 6:45 a.m. · 1 h 15 min trip
nonstop
found 3 days ago
Found recently, and the cheapest we hold
$139 18 Jan 2027found 3 days agoOpen this trip
$51 5 Novfound 5 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 $51 to $67.
At $139, 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 4 departure dates from 5 Nov to 18 Jan 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?
We hold no other one-way fares leaving within 3 days of 18 Jan 2027 to compare.
Every date we hold
5 fares on 4 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 5 Nov | $51 | Southwest Airlines | Ontario International Airport (ONT) → Norman Y. Mineta San Jose International Airport (SJC) | nonstop | found 5 days ago | Open this trip |
| 16 Nov | $69 | Southwest Airlines | Ontario International Airport (ONT) → Norman Y. Mineta San Jose International Airport (SJC) | nonstop | found 6 days ago | Open this trip |
| 17 Dec | $55 | Southwest Airlines | Ontario International Airport (ONT) → Norman Y. Mineta San Jose International Airport (SJC) | nonstop | found 4 days ago | Open this trip |
| 18 Jan 2027 | $139 | Southwest Airlines | Ontario International Airport (ONT) → Norman Y. Mineta San Jose International Airport (SJC) | nonstop | found 3 days ago | Open this trip |
Which month looks cheapest?
November 2026 is the cheapest month — from $51.
Airlines on the cheapest dates: Southwest Airlines.
Premium cabin fares from Ontario to San Jose
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 21 Nov – 27 Nov in another cabin: Premium economy · Business · First
Today's prices for 18 Jan 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Ontario to San Jose?
Return
The cheapest fares were 30 to 59 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 |
|---|---|---|---|---|
| 14–29 days | $107 | $84 | +1% | 17 |
| 30–59 days | $106 | $84 | Cheapest seen | 25 |
| 60–89 days | $136 | $126 | +28% | 17 |
| 90–179 days | $128 | $128 | +21% | 8 |
One-way
Timing didn't matter much here — prices were about the same in every range.
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 |
|---|---|---|---|---|
| 14–29 days | $64 | $51 | Cheapest seen | 15 |
| 30–59 days | $66 | $62 | +3% | 13 |
| 60–89 days | $64 | $55 | +0% | 18 |
| 90–179 days | $67 | $64 | +5% | 25 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Ontario → San Francisco
67 km from San Jose
$130
$8 less than flying to San Jose
15 Nov – 18 Nov · ONT → SFO · out nonstop, back nonstop
found yesterday
Los Angeles → San Jose
56 km from Ontario
$66
$72 less than flying from Ontario
21 Nov – 27 Nov · LAX → SJC · out nonstop, back nonstop
found 3 days ago
Ontario → Sacramento
142 km from San Jose
$272
$134 more than flying to San Jose
24 Oct – 31 Oct · ONT → SMF · out 1 stop, back 1 stop
found 2 days ago
Long Beach → San Jose
60 km from Ontario
$133
$5 less than flying from Ontario
8 Jan 2027 – 9 Jan 2027 · LGB → SJC · 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
Ontario → San Francisco
67 km from San Jose
$21
$118 less than flying to San Jose
5 Dec · ONT → SFO · nonstop
found today
Los Angeles → San Jose
56 km from Ontario
$33
$106 less than flying from Ontario
6 Nov · LAX → SJC · nonstop
found yesterday
Long Beach → San Jose
60 km from Ontario
$123
$16 less than flying from Ontario
12 Nov · LGB → SJC · nonstop
found today
Ontario → Oakland
61 km from San Jose
$136
$3 less than flying to San Jose
25 Nov · ONT → OAK · 1 stop
found yesterday
Ontario → Sacramento
142 km from San Jose
$201
$62 more than flying to San Jose
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 21 Nov – 27 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