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Cheap flights from Ontario to San Juan from $174

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 4/18. 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
4:15 pm - 5:53 am
ONT
-
SJU
10h 38m
1 stop
Frontier Logo
6:15 am - 3:25 pm
SJU
-
ONT
12h 10m
1 stop
$276Frontier
Tue, Aug 11 - Wed, Aug 19
Delta Logo
10:15 pm - 11:45 am
ONT
-
SJU
10h 30m
1 stop
Delta Logo
12:55 pm - 9:00 pm
SJU
-
ONT
11h 05m
1 stop
$354Delta
Sat, May 2 - Wed, May 6
Frontier Logo
4:15 pm - 5:53 am
ONT
-
SJU
10h 38m
1 stop
Frontier Logo
6:15 am - 3:25 pm
SJU
-
ONT
12h 10m
1 stop
$361Frontier
Mon, Aug 10 - Wed, Aug 19
Frontier Logo
4:15 pm - 5:53 am
ONT
-
SJU
10h 38m
1 stop
Frontier Logo
6:15 am - 3:25 pm
SJU
-
ONT
12h 10m
1 stop
$366Frontier
Wed, Aug 5 - Wed, Aug 12
Multiple Airlines Logo
4:15 pm - 5:53 am
ONT
-
SJU
10h 38m
1 stop
Multiple Airlines Logo
1:25 pm - 9:29 pm
SJU
-
ONT
11h 04m
1 stop
$368Multiple Airlines
Wed, Sep 2 - Wed, Sep 16
Delta Logo
10:15 pm - 11:45 am
ONT
-
SJU
10h 30m
1 stop
Delta Logo
12:55 pm - 9:00 pm
SJU
-
ONT
11h 05m
1 stop
$388Delta
Sat, Apr 18 - Fri, Apr 24
American Airlines Logo
10:26 pm - 8:51 pm
ONT
-
SJU
19h 25m
1 stop
American Airlines Logo
7:25 am - 9:07 pm
SJU
-
ONT
16h 42m
1 stop
$402American Airlines
Fri, May 1 - Wed, May 6
Frontier Logo
4:15 pm - 5:53 am
ONT
-
SJU
10h 38m
1 stop
Frontier Logo
6:15 am - 3:25 pm
SJU
-
ONT
12h 10m
1 stop
$406Frontier
Tue, Aug 4 - Wed, Aug 12
United Airlines Logo
7:00 am - 11:50 pm
ONT
-
SJU
13h 50m
2 stops
United Airlines Logo
1:00 am - 12:22 pm
SJU
-
ONT
14h 22m
2 stops
$411United Airlines
Sat, Apr 25 - Thu, Apr 30
Delta Logo
10:59 pm - 11:56 am
ONT
-
SJU
9h 57m
1 stop
Delta Logo
7:30 am - 6:01 pm
SJU
-
ONT
13h 31m
1 stop
$412Delta
Sun, Aug 30 - Fri, Sep 4

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
Aug 11
ONT4:15 pmOntario
10h 38m
1 stop
SJU5:53 amSan Juan Luis Munoz Marin Intl
Aug 19
SJU6:15 amSan Juan Luis Munoz Marin Intl
12h 10m
1 stop
ONT3:25 pmOntario
$276
Frontier
Aug 10
ONT4:15 pmOntario
10h 38m
1 stop
SJU5:53 amSan Juan Luis Munoz Marin Intl
Aug 19
SJU6:15 amSan Juan Luis Munoz Marin Intl
12h 10m
1 stop
ONT3:25 pmOntario
$361
Frontier
Aug 5
ONT4:15 pmOntario
10h 38m
1 stop
SJU5:53 amSan Juan Luis Munoz Marin Intl
Aug 12
SJU6:15 amSan Juan Luis Munoz Marin Intl
12h 10m
1 stop
ONT3:25 pmOntario
$366

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

Our best Delta deals on Ontario to San Juan Luis Munoz Marin Intl Airport flight tickets
Delta
May 2
ONT10:15 pmOntario
10h 30m
1 stop
SJU11:45 amSan Juan Luis Munoz Marin Intl
May 6
SJU12:55 pmSan Juan Luis Munoz Marin Intl
11h 05m
1 stop
ONT9:00 pmOntario
$354
Delta
Apr 18
ONT10:15 pmOntario
10h 30m
1 stop
SJU11:45 amSan Juan Luis Munoz Marin Intl
Apr 24
SJU12:55 pmSan Juan Luis Munoz Marin Intl
11h 05m
1 stop
ONT9:00 pmOntario
$388
Delta
Aug 30
ONT10:59 pmOntario
9h 57m
1 stop
SJU11:56 amSan Juan Luis Munoz Marin Intl
Sep 4
SJU7:30 amSan Juan Luis Munoz Marin Intl
13h 31m
1 stop
ONT6:01 pmOntario
$412

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 March 22, 2026.
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

Cheapest round-trip

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 8/11

4:15 pm-5:53 am

1 stop10h 38m

San Juan Luis Munoz Marin Intl

Wed 8/19

6:15 am-3:25 pm

1 stop12h 10m

$276
Quickest round-trip

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 5/2

10:15 pm-11:45 am

1 stop10h 30m

San Juan Luis Munoz Marin Intl

Wed 5/6

12:55 pm-9:00 pm

1 stop11h 05m

$354

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 8/10

4:15 pm-5:53 am

1 stop10h 38m

San Juan Luis Munoz Marin Intl

Wed 8/19

6:15 am-3:25 pm

1 stop12h 10m

$361

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 8/5

4:15 pm-5:53 am

1 stop10h 38m

San Juan Luis Munoz Marin Intl

Wed 8/12

6:15 am-3:25 pm

1 stop12h 10m

$366

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 9/2

4:15 pm-5:53 am

1 stop10h 38m

San Juan Luis Munoz Marin Intl

Wed 9/16

1:25 pm-9:29 pm

1 stop11h 04m

$368

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 4/18

10:15 pm-11:45 am

1 stop10h 30m

San Juan Luis Munoz Marin Intl

Fri 4/24

12:55 pm-9:00 pm

1 stop11h 05m

$388

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Fri 5/1

10:26 pm-8:51 pm

1 stop19h 25m

San Juan Luis Munoz Marin Intl

Wed 5/6

7:25 am-9:07 pm

1 stop16h 42m

$402

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 8/4

4:15 pm-5:53 am

1 stop10h 38m

San Juan Luis Munoz Marin Intl

Wed 8/12

6:15 am-3:25 pm

1 stop12h 10m

$406

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sat 4/25

7:00 am-11:50 pm

2 stops13h 50m

San Juan Luis Munoz Marin Intl

Thu 4/30

1:00 am-12:22 pm

2 stops14h 22m

$411

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sun 8/30

10:59 pm-11:56 am

1 stop9h 57m

San Juan Luis Munoz Marin Intl

Fri 9/4

7:30 am-6:01 pm

1 stop13h 31m

$412

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 typical price of a round-trip flight between Ontario and San Juan Luis Munoz Marin Intl Airport?

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 February is also cheap. Prices for this month can be found on momondo for an average of $484.

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 $576 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 $451 on momondo.

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

You could potentially save up to 18% 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 March 2026, prices for Ontario to San Juan Luis Munoz Marin Intl Airport flights are approximately 27% 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 10m

Direct flights

None
The fastest flight from Ontario to San Juan Luis Munoz Marin Intl Airport takes 9h 10m
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 10m 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 $137Free CancellationRating
5.7
3,020 reviews
Search Frontier flights
DeltaPriceFrom $292Free CancellationRating
7.9
8,315 reviews
Search Delta flights
United AirlinesPriceFrom $321Free CancellationRating
7.4
9,458 reviews
Search United Airlines flights
American AirlinesPriceFrom $365Free CancellationRating
7.1
11,485 reviews
Search American Airlines flights
SouthwestPriceFrom $445Free CancellationRating
8.0
4,325 reviews
Search Southwest flights
JetBluePriceFrom $455Free CancellationRating
7.2
2,911 reviews
Search JetBlue 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
Caguas
Rio Grande
Humacao
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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