Ontario to San Jose ONT → SJO
Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO)
The cheapest return found recently is $713 with Southwest Airlines, 11 Nov – 25 Nov, found today. The cheapest one-way found recently is $306 with Southwest Airlines, 2 Aug 2027, found 5 days ago.
Return
The cheapest return fare on each of 11 departure dates is usually $705 to $1,012.
Cheapest return found recently
$713
11 Nov – 25 Nov · Southwest Airlines
Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO)
Leaves 5:00 p.m. · Return leaves 3:25 p.m. · 39 h 45 min of travel, both ways together
out 2 stops, back 1 stop
found today
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$713 11 Nov – 25 Novfound todaySee prices for these dates
$625 16 Apr 2027 – 23 Apr 2027found 3 days agoSee prices for these dates
What have prices looked like?
Over 24 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $535 to $886.
24 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 11 departure dates from 11 Nov to 16 Apr 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 14-night return fares on 1 other departure date within 3 days of 11 Nov, and it is not cheaper.
Every date we hold
11 fares on 11 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 11 Nov – 25 Nov | $713 | Southwest Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 2 stops, back 1 stop | found today | See prices for these dates |
| 13 Nov – 27 Nov | $800 | American Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 2 stops, back 1 stop | found 5 days ago | See prices for these dates |
| 16 Nov – 23 Nov | $737 | Southwest Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 2 stops, back 1 stop | found today | See prices for these dates |
| 1 Dec – 5 Dec | $646 | avianca airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 1 stop, back 1 stop | found 6 days ago | See prices for these dates |
| 18 Dec – 1 Jan 2027 | $1,192 | American Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 2 stops, back nonstop | found 6 days ago | See prices for these dates |
| 19 Dec – 2 Jan 2027 | $1,137 | avianca airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 1 stop, back 1 stop | found 6 days ago | See prices for these dates |
| 20 Dec – 2 Jan 2027 | $1,078 | American Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 2 stops, back nonstop | found 6 days ago | See prices for these dates |
| 29 Dec – 4 Jan 2027 | $946 | United Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 1 stop, back 1 stop | found 5 days ago | See prices for these dates |
| 11 Jan 2027 – 19 Jan 2027 | $697 | Southwest Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 2 stops, back 1 stop | found 4 days ago | See prices for these dates |
| 1 Feb 2027 – 7 Feb 2027 | $720 | United Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 1 stop, back nonstop | found 2 days ago | See prices for these dates |
| 16 Apr 2027 – 23 Apr 2027 | $625 | Southwest Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 2 stops, back 2 stops | found 3 days ago | See prices for these dates |
Which month looks cheapest?
April 2027 is the cheapest month — from $625.
Airlines on the cheapest dates: Southwest Airlines, American Airlines, avianca airlines, United Airlines.
One-way
The cheapest one-way fare on each of 7 departure dates is usually $332 to $361.
Cheapest one-way found recently
$306
2 Aug 2027 · Southwest Airlines
Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO)
Leaves 6:30 a.m. · 11 h 30 min trip
2 stops
found 5 days ago
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$306 2 Aug 2027found 5 days agoOpen this trip
It is also the cheapest one-way we hold, of any age.
What have prices looked like?
Over 8 days, 24 Sept to 18 Oct, the cheapest one-way we saw each day was $281 to $362.
8 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 7 departure dates from 12 Jul 2027 to 4 Aug 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 2 Aug 2027, and none is cheaper.
Every date we hold
7 fares on 7 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 12 Jul 2027 | $310 | Southwest Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | 2 stops | found 5 days ago | Open this trip |
| 13 Jul 2027 | $354 | Southwest Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | 2 stops | found 5 days ago | Open this trip |
| 14 Jul 2027 | $363 | Southwest Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | 2 stops | found 5 days ago | Open this trip |
| 15 Jul 2027 | $408 | American Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | 1 stop | found 5 days ago | Open this trip |
| 2 Aug 2027 | $306 | Southwest Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | 2 stops | found 5 days ago | Open this trip |
| 3 Aug 2027 | $359 | American Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | 1 stop | found 5 days ago | Open this trip |
| 4 Aug 2027 | $359 | American Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | 1 stop | found 5 days ago | Open this trip |
Which month looks cheapest?
August 2027 is the cheapest month — from $306.
Airlines on the cheapest dates: Southwest Airlines, American 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 11 Nov – 25 Nov in another cabin: Premium economy · Business · First
Today's prices for 2 Aug 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Ontario to San Jose?
Return
Fares 180 or more days before departure were typically 24% lower than 14 to 29 days before departure.
From the cheapest return each day between 24 Sept and 18 Oct (24 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 | $800 | $646 | +32% | 7 |
| 30–59 days | $646 | $559 | +6% | 14 |
| 60–89 days | $934 | $535 | +54% | 18 |
| 90–179 days | $625 | $625 | +3% | 11 |
| 180+ days | $607 | $540 | Cheapest seen | 9 |
One-way
Not enough history yet: in 8 days of one-way prices, 24 Sept to 18 Oct, fewer than 3 booking ranges had prices on 7 days or more.
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Los Angeles → San Jose
56 km from Ontario
$671
$42 less than flying from Ontario
11 Nov – 25 Nov · LAX → SJO · out 1 stop, back 1 stop
found today
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Los Angeles → San Jose
56 km from Ontario
$255
$51 less than flying from Ontario
13 Jul 2027 · LAX → SJO · 1 stop
found 5 days ago
Long Beach → San Jose
60 km from Ontario
$643
$337 more than flying from Ontario
3 Aug 2027 · LGB → SJO · 3 stops
found 5 days ago
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 11 Nov – 25 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