Cheap flights from San Jose, Costa Rica to Ontario from $765 SJO → ONT
Juan Santamaria International Airport (SJO) → Ontario International Airport (ONT)
The cheapest return found recently is $765 with avianca airlines, 11 Dec – 17 Dec, found 2 days ago.
- Cheapest return found recently
- $765, 11 Dec to 17 Dec
- Usual return price
- $651 to $719
- Cheapest month to fly
- March 2027, return fares from $628 found in the last 7 days
Return
The cheapest return fare on each of 3 departure dates is usually $651 to $719.
Cheapest return found recently
$765
11 Dec – 17 Dec · avianca airlines
Juan Santamaria International Airport (SJO) → Ontario International Airport (ONT)
Leaves 7:45 p.m. · Return leaves 1:40 p.m. · 49 h 20 min of travel, both ways together
out 1 stop, back 1 stop
found 2 days ago
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$765 11 Dec – 17 Decfound 2 days agoSee prices for these dates
$628 1 Mar 2027 – 4 Mar 2027found 5 days agoSee prices for these dates
What have prices looked like?
Over 38 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $262 to $628.
At $765, the cheapest return found recently is above that range.
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 3 departure dates from 11 Dec to 12 Oct 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 6-night return fares leaving within 3 days of 11 Dec to compare.
Every date we hold
3 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 11 Dec – 17 Dec | $765 | avianca airlines | Juan Santamaria International Airport (SJO) → Ontario International Airport (ONT) | out 1 stop, back 1 stop | found 2 days ago | See prices for these dates |
| 1 Mar 2027 – 4 Mar 2027 | $628 | Southwest Airlines | Juan Santamaria International Airport (SJO) → Ontario International Airport (ONT) | out 2 stops, back 1 stop | found 5 days ago | See prices for these dates |
| 12 Oct 2027 – 18 Oct 2027 | $673 | avianca airlines | Juan Santamaria International Airport (SJO) → Ontario International Airport (ONT) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
Which month looks cheapest?
March 2027 is the cheapest month — from $628.
Airlines on the cheapest dates: avianca airlines, Southwest Airlines.
Premium cabin fares from San Jose to Ontario
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 Dec – 17 Dec in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for San Jose to Ontario?
Return
The cheapest fares were 7 to 13 days before departure.
From the cheapest return each day between 24 Sept and 11 Nov (38 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 |
|---|---|---|---|---|
| 7–13 days | $559 | $309 | Cheapest seen | 10 |
| 14–29 days | $579 | $262 | +4% | 17 |
| 30–59 days | $585 | $558 | +5% | 7 |
| 60–89 days | $832 | $785 | +49% | 7 |
| 90–179 days | $628 | $383 | +12% | 7 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
San Jose → Los Angeles
56 km from Ontario
$564
$201 less than flying to Ontario
12 Feb 2027 – 17 Feb 2027 · SJO → SNA · out 2 stops, back 1 stop
found 4 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 11 Dec – 17 Dec. 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 San Jose to Ontario?
The cheapest return found recently is $765 with avianca airlines, 11 Dec to 17 Dec, found 2 days ago. The cheapest return we hold, of any age, is $628 with Southwest Airlines, 1 Mar 2027 to 4 Mar 2027, found 5 days ago. The cheapest return fare on each of 3 departure dates is usually $651 to $719.
What is the cheapest month to fly from San Jose to Ontario?
March 2027 is the cheapest month for a return, from $628, 1 Mar 2027 to 4 Mar 2027, found 5 days ago.
How far ahead should I book a flight from San Jose to Ontario?
In 38 days of prices between 24 Sept and 11 Nov, return fares were cheapest 7 to 13 days before departure.
Which airlines have the cheapest flights from San Jose to Ontario?
Between 11 Dec and 12 Oct 2027, avianca airlines has the cheapest return on 2 of the 3 departure dates we hold, and Southwest 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