Cheap flights from Ontario to San Jose, Costa Rica from $326 ONT → SJO
Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO)
The cheapest return found recently is $717 with United Airlines, 18 Jan 2027 – 30 Jan 2027, found yesterday. The cheapest one-way found recently is $326 with Southwest Airlines, 22 Mar 2027, found 4 days ago.
- Cheapest one-way found recently
- $326, found 4 days ago
- Cheapest return found recently
- $717, 18 Jan 2027 to 30 Jan 2027
- Usual return price
- $713 to $838
- Cheapest month to fly
- March 2027, return fares from $651 found in the last 7 days
Return
The cheapest return fare on each of 6 departure dates is usually $713 to $838.
Cheapest return found recently
$717
18 Jan 2027 – 30 Jan 2027 · United Airlines
Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO)
Leaves 6:37 p.m. · Return leaves 3:00 p.m. · 21 h 8 min of travel, both ways together
out 1 stop, back 1 stop
found yesterday
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$717 18 Jan 2027 – 30 Jan 2027found yesterdaySee prices for these dates
$651 20 Mar 2027 – 27 Mar 2027found 3 days agoSee prices for these dates
What have prices looked like?
Over 49 days, 24 Sept to 12 Nov, the cheapest return we saw each day was $535 to $886.
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 6 departure dates from 27 Nov 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?
We hold no other 12-night return fares leaving within 3 days of 18 Jan 2027 to compare.
Every date we hold
6 fares on 6 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 27 Nov – 7 Dec | $749 | American Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
| 22 Dec – 14 Jan 2027 | $868 | Volaris | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 1 stop, back 1 stop | found today | See prices for these dates |
| 6 Jan 2027 – 12 Jan 2027 | $874 | Southwest Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 2 stops, back 1 stop | found today | See prices for these dates |
| 18 Jan 2027 – 30 Jan 2027 | $717 | United Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 1 stop, back 1 stop | found yesterday | See prices for these dates |
| 25 Jan 2027 – 1 Feb 2027 | $711 | Southwest Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 2 stops, back 1 stop | found 3 days ago | See prices for these dates |
| 20 Mar 2027 – 27 Mar 2027 | $651 | Volaris | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | out 1 stop, back 1 stop | found 3 days ago | See prices for these dates |
Which month looks cheapest?
March 2027 is the cheapest month — from $651.
Airlines on the cheapest dates: Volaris, Southwest Airlines, American Airlines, United Airlines.
One-way
Not enough comparable prices yet for a usual one-way price.
Cheapest one-way found recently
$326
22 Mar 2027 · Southwest Airlines
Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO)
Leaves 5:25 a.m. · 13 h 15 min trip
2 stops
found 4 days ago
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$326 22 Mar 2027found 4 days agoOpen this trip
It is also the cheapest one-way we hold, of any age.
What have prices looked like?
Over 22 days, 24 Sept to 12 Nov, the cheapest one-way we saw each day was $281 to $381.
22 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?
Not enough comparable prices yet: we hold one-way fares on 1 departure date and need at least 3 to say what is usual.
Could nearby dates be cheaper?
We hold no other one-way fares leaving within 3 days of 22 Mar 2027 to compare.
Every date we hold
1 fares on 1 departure dates
See every date as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 22 Mar 2027 | $326 | Southwest Airlines | Ontario International Airport (ONT) → Juan Santamaria International Airport (SJO) | 2 stops | found 4 days ago | Open this trip |
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 18 Jan 2027 – 30 Jan 2027 in another cabin: Premium economy · Business · First
Today's prices for 22 Mar 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 15% lower than 14 to 29 days before departure.
From the cheapest return each day between 24 Sept and 12 Nov (49 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 | $713 | $646 | +18% | 20 |
| 30–59 days | $839 | $559 | +38% | 33 |
| 60–89 days | $763 | $535 | +26% | 34 |
| 90–179 days | $625 | $625 | +3% | 19 |
| 180+ days | $607 | $540 | Cheapest seen | 9 |
One-way
Not enough history yet: in 22 days of one-way prices, 24 Sept to 12 Nov, 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
$611
$106 less than flying from Ontario
18 Jan 2027 – 30 Jan 2027 · LAX → SJO · out 1 stop, back 1 stop
found yesterday
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
$233
$93 less than flying from Ontario
22 Mar 2027 · LAX → SJO · 1 stop
found 4 days ago
Long Beach → San Jose
60 km from Ontario
$553
$227 more than flying from Ontario
22 Mar 2027 · LGB → SJO · 3 stops
found 4 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 18 Jan 2027 – 30 Jan 2027. A live search on this page shows what those dates cost now, for one adult in economy.
Questions about this trip
How much is a return flight from Ontario to San Jose?
The cheapest return found recently is $717 with United Airlines, 18 Jan 2027 to 30 Jan 2027, found yesterday. The cheapest return we hold, of any age, is $651 with Volaris, 20 Mar 2027 to 27 Mar 2027, found 3 days ago. The cheapest return fare on each of 6 departure dates is usually $713 to $838.
How much is a one-way flight from Ontario to San Jose?
The cheapest one-way found recently is $326 with Southwest Airlines, 22 Mar 2027, found 4 days ago.
What is the cheapest month to fly from Ontario to San Jose?
March 2027 is the cheapest month for a return, from $651, 20 Mar 2027 to 27 Mar 2027, found 3 days ago.
How far ahead should I book a flight from Ontario to San Jose?
In 49 days of prices between 24 Sept and 12 Nov, return fares 180 or more days before departure were typically 15% lower than 14 to 29 days before departure.
How long is the flight from Ontario to San Jose?
The cheapest one-way found recently, with Southwest Airlines on 22 Mar 2027, takes 13 h 15 min with 2 stops.
Which airlines have the cheapest flights from Ontario to San Jose?
Between 27 Nov and 20 Mar 2027, Volaris has the cheapest return on 2 of the 6 departure dates we hold, Southwest Airlines on 2 and American Airlines on 1.
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