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Cheap flights from Ontario to San Juan from $113

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to San Juan departing on 1/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to San Juan

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:31 am - 6:34 am
ONT
-
SJU
18h 03m1 stop
Frontier Logo
7:05 pm - 10:59 pm
SJU
-
ONT
31h 54m2 stops
$280Frontier
Fri, Jan 9 - Mon, Jan 12
United Airlines Logo
6:00 am - 9:26 pm
ONT
-
SJU
11h 26m1 stop
United Airlines Logo
8:35 am - 5:43 pm
SJU
-
ONT
13h 08m2 stops
$283United Airlines
Sun, Jan 18 - Thu, Jan 22
Frontier Logo
8:31 am - 6:34 am
ONT
-
SJU
18h 03m1 stop
Frontier Logo
7:05 pm - 10:59 pm
SJU
-
ONT
31h 54m2 stops
$302Frontier
Fri, Jan 9 - Mon, Jan 12
American Airlines Logo
4:45 pm - 10:48 am
ONT
-
SJU
14h 03m2 stops
American Airlines Logo
8:20 am - 6:20 pm
SJU
-
ONT
14h 00m2 stops
$308American Airlines
Sun, Jan 18 - Thu, Jan 22
Multiple Airlines Logo
7:56 pm - 12:27 pm
ONT
-
SJU
12h 31m1 stop
Multiple Airlines Logo
6:00 am - 2:27 pm
SJU
-
ONT
36h 27m2 stops
$311Multiple Airlines
Sun, Jan 18 - Sun, Jan 25
United Airlines Logo
8:00 am - 9:26 pm
ONT
-
SJU
9h 26m1 stop
United Airlines Logo
8:35 am - 8:58 pm
SJU
-
ONT
16h 23m2 stops
$323United Airlines
Tue, Jan 20 - Tue, Jan 27
Multiple Airlines Logo
8:32 am - 12:27 pm
ONT
-
SJU
23h 55m1 stop
Multiple Airlines Logo
4:22 pm - 11:24 pm
SJU
-
ONT
35h 02m2 stops
$326Multiple Airlines
Fri, Jan 16 - Fri, Jan 23
JetBlue Logo
11:25 pm - 1:47 pm
ONT
-
SJU
11h 22m1 stop
JetBlue Logo
1:50 pm - 10:09 pm
SJU
-
ONT
11h 19m1 stop
$342JetBlue
Mon, May 11 - Thu, May 14
Frontier Logo
4:22 pm - 6:34 am
ONT
-
SJU
10h 12m1 stop
Frontier Logo
7:06 pm - 7:24 am
SJU
-
ONT
16h 18m1 stop
$344Frontier
Wed, Dec 24 - Mon, Dec 29
Multiple Airlines Logo
6:20 am - 11:59 pm
ONT
-
SJU
13h 39m2 stops
Multiple Airlines Logo
7:44 pm - 2:27 pm
SJU
-
ONT
22h 43m1 stop
$355Multiple Airlines
Fri, Jan 23 - Sun, Jan 25

United Airlines flights from Ontario to San Juan Luis Munoz Marin Intl Airport

Our best United Airlines deals on Ontario to San Juan Luis Munoz Marin Intl Airport flight tickets
United Airlines
Feb 25
ONT8:00 amOntario
9h 26m
1 stop
SJU9:26 pmSan Juan Luis Munoz Marin Intl
Mar 4
SJU3:46 pmSan Juan Luis Munoz Marin Intl
10h 13m
1 stop
ONT9:59 pmOntario
$283
Find similar
United Airlines
Feb 24
ONT8:00 amOntario
9h 26m
1 stop
SJU9:26 pmSan Juan Luis Munoz Marin Intl
Feb 26
SJU3:46 pmSan Juan Luis Munoz Marin Intl
10h 13m
1 stop
ONT9:59 pmOntario
$373
Find similar
United Airlines
Apr 17
ONT6:00 amOntario
11h 38m
1 stop
SJU8:38 pmSan Juan Luis Munoz Marin Intl
Apr 21
SJU1:00 amSan Juan Luis Munoz Marin Intl
14h 38m
2 stops
ONT12:38 pmOntario
$386
Find similar

Frontier flights from Ontario to San Juan Luis Munoz Marin Intl Airport

Our best Frontier deals on Ontario to San Juan Luis Munoz Marin Intl Airport flight tickets
Frontier
Jan 9
ONT8:31 amOntario
18h 03m
1 stop
SJU6:34 amSan Juan Luis Munoz Marin Intl
Jan 12
SJU7:05 pmSan Juan Luis Munoz Marin Intl
31h 54m
2 stops
ONT10:59 pmOntario
$280
Find similar
Frontier
Jan 9
ONT8:31 amOntario
18h 03m
1 stop
SJU6:34 amSan Juan Luis Munoz Marin Intl
Jan 12
SJU7:05 pmSan Juan Luis Munoz Marin Intl
31h 54m
2 stops
ONT10:59 pmOntario
$302
Find similar
Frontier
Dec 18
ONT4:16 pmOntario
10h 18m
1 stop
SJU6:34 amSan Juan Luis Munoz Marin Intl
Dec 22
SJU7:06 pmSan Juan Luis Munoz Marin Intl
16h 18m
1 stop
ONT7:24 amOntario
$314
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to San Juan Luis Munoz Marin Intl Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 11, 2025.
Use the filters below to find and compare flights from Ontario to San Juan Luis Munoz Marin Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Fri 1/9

8:31 am-6:34 am

1 stop18h 03m

San Juan Luis Munoz Marin Intl

Mon 1/12

7:05 pm-10:59 pm

2 stops31h 54m

$280

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sun 1/18

6:00 am-9:26 pm

1 stop11h 26m

San Juan Luis Munoz Marin Intl

Thu 1/22

8:35 am-5:43 pm

2 stops13h 08m

$283

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Fri 1/9

8:31 am-6:34 am

1 stop18h 03m

San Juan Luis Munoz Marin Intl

Mon 1/12

7:05 pm-10:59 pm

2 stops31h 54m

$302

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sun 1/18

4:45 pm-10:48 am

2 stops14h 03m

San Juan Luis Munoz Marin Intl

Thu 1/22

8:20 am-6:20 pm

2 stops14h 00m

$308

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sun 1/18

7:56 pm-12:27 pm

1 stop12h 31m

San Juan Luis Munoz Marin Intl

Sun 1/25

6:00 am-2:27 pm

2 stops36h 27m

$311

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 1/20

8:00 am-9:26 pm

1 stop9h 26m

San Juan Luis Munoz Marin Intl

Tue 1/27

8:35 am-8:58 pm

2 stops16h 23m

$323

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Fri 1/16

8:32 am-12:27 pm

1 stop23h 55m

San Juan Luis Munoz Marin Intl

Fri 1/23

4:22 pm-11:24 pm

2 stops35h 02m

$326

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 5/11

11:25 pm-1:47 pm

1 stop11h 22m

San Juan Luis Munoz Marin Intl

Thu 5/14

1:50 pm-10:09 pm

1 stop11h 19m

$342

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 12/24

4:22 pm-6:34 am

1 stop10h 12m

San Juan Luis Munoz Marin Intl

Mon 12/29

7:06 pm-7:24 am

1 stop16h 18m

$344

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Fri 1/23

6:20 am-11:59 pm

2 stops13h 39m

San Juan Luis Munoz Marin Intl

Sun 1/25

7:44 pm-2:27 pm

1 stop22h 43m

$355

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to San Juan from

How to get the cheapest flight ticket from Ontario to San Juan Luis Munoz Marin Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to San Juan Luis Munoz Marin Intl Airport?

If you aren’t able to travel to San Juan Luis Munoz Marin Intl Airport during the month of October, then flying in April is also cheap. Prices for this month can be found on momondo for an average of $477.

What is the cheapest day to depart on your flight to San Juan Luis Munoz Marin Intl Airport?

On average, the least expensive day to fly to San Juan Luis Munoz Marin Intl Airport from Ontario is on a Sunday. momondo users have found tickets for Sunday departures for as low as $520. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Saturday is the most expensive day to depart from Ontario because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $538.

What is the cheapest time of day to depart on your flight to San Juan Luis Munoz Marin Intl Airport?

The cheapest time of day to fly to San Juan Luis Munoz Marin Intl Airport is at noon when flights can be purchased for as low as $388. Flights in the afternoon are often more expensive with an average ticket price of $481.

How far in advance should I book a flight to San Juan Luis Munoz Marin Intl Airport?

You are more likely to see cheaper flights to San Juan Luis Munoz Marin Intl Airport from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan Luis Munoz Marin Intl Airport for around $564 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Juan Luis Munoz Marin Intl Airport from Ontario for as low as $494 on momondo.

Can stopping save me money on Ontario to San Juan Luis Munoz Marin Intl Airport flights?

You could potentially save up to 5% on your flight if you consider stops on a Ontario to San Juan Luis Munoz Marin Intl Airport flight.

How have Ontario to San Juan Luis Munoz Marin Intl Airport flight prices changed over time?

As of December 2025, prices for Ontario to San Juan Luis Munoz Marin Intl Airport flights are approximately 9% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to San Juan Luis Munoz Marin Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to San Juan Luis Munoz Marin Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to San Juan Luis Munoz Marin Intl Airport (ONT to SJU) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to San Juan Luis Munoz Marin Intl Airport

Fastest flight time

9h 20m

Direct flights

None
The fastest flight from Ontario to San Juan Luis Munoz Marin Intl Airport takes 9h 20m
There are no direct flights from Ontario to San Juan Luis Munoz Marin Intl Airport. There are no popular flight routes from Ontario to San Juan Luis Munoz Marin Intl Airport.
Search flight deals

  • How far is Ontario to San Juan Luis Munoz Marin Intl by plane?

    A flight from Ontario to San Juan Luis Munoz Marin Intl will travel around 3337.2 mi. Typically, this will take 9h 20m by plane in normal conditions.

  • When did momondo last update prices for flights from Ontario Airport to San Juan Luis Munoz Marin Intl Airport?

    Prices for flights from Ontario Airport to San Juan Luis Munoz Marin Intl Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to San Juan Luis Munoz Marin Intl Airport?

  • How old do you have to be to fly from Ontario Airport to San Juan Luis Munoz Marin Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to San Juan Luis Munoz Marin Intl Airport.

  • What documentation or ID do you need to fly to San Juan Luis Munoz Marin Intl Airport?

    The necessary travel and health documents for your San Juan Luis Munoz Marin Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Ontario to San Juan Luis Munoz Marin Intl Airport?

Best airlines flying from Ontario to San Juan Luis Munoz Marin Intl Airport

Compare and see reviews for airlines that fly from Ontario to San Juan Luis Munoz Marin Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $73Free CancellationRating
5.8
3,084 reviews
Search Frontier flights
DeltaPriceFrom $355Free CancellationRating
7.9
8,008 reviews
Search Delta flights
United AirlinesPriceFrom $355Free CancellationRating
7.4
9,095 reviews
Search United Airlines flights
American AirlinesPriceFrom $365Free CancellationRating
7.2
11,050 reviews
Search American Airlines flights
SouthwestPriceFrom $480Free CancellationRating
7.9
4,253 reviews
Search Southwest flights

Traveling to a place near San Juan?

Book flights to San Juan if you plan to visit one of these locations
Carolina
Fajardo
Dorado
Luquillo
Humacao
Caguas
Rio Grande
Bayamón

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to San Juan?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to San Juan. momondo saves you time and could save you money on your trip.

Can I find flights from Ontario to San Juan with flexible booking policies on momondo?

Yes. All flights to San Juan from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Ontario to San Juan?

Once you have performed a search for Ontario to San Juan flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Ontario to San Juan right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Ontario to San Juan flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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