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Cheap flights from Ontario to San Juan from $168

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 9/26. 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 (ONT-SJU)

Cheap round-trip flights

Southwest Logo
9:15 am - 12:35 amONT-SJU
12h 20m1 stop
Southwest Logo
8:45 am - 6:15 pmSJU-ONT
12h 30m1 stop
$335Southwest
Find Deal
Sun, Sep 21 - Sat, Sep 27
Logo
12:28 pm - 2:11 pmONT-SJU
22h 43m2 stops
Logo
3:22 pm - 6:35 pmSJU-ONT
30h 13m1 stop
$348
Find Deal
Fri, Sep 19 - Thu, Sep 25
United Airlines Logo
7:00 am - 9:00 pmONT-SJU
10h 00m1 stop
United Airlines Logo
2:25 pm - 8:44 pmSJU-ONT
10h 19m1 stop
$353United Airlines
Find Deal
Tue, Nov 11 - Thu, Nov 20
United Airlines Logo
6:04 am - 8:38 pmONT-SJU
11h 34m1 stop
United Airlines Logo
1:05 am - 12:13 pmSJU-ONT
14h 08m2 stops
$354United Airlines
Find Deal
Wed, Sep 24 - Tue, Sep 30
American Airlines Logo
3:05 pm - 4:55 amONT-SJU
9h 50m1 stop
American Airlines Logo
8:04 am - 11:43 pmSJU-ONT
19h 39m1 stop
$360American Airlines
Find Deal
Mon, Feb 16 - Thu, Feb 26
Logo
12:28 pm - 6:45 pmONT-SJU
27h 17m2 stops
Logo
3:22 pm - 6:35 pmSJU-ONT
30h 13m1 stop
$367
Find Deal
Thu, Sep 25 - Thu, Oct 2
American Airlines Logo
10:35 pm - 3:52 pmONT-SJU
14h 17m1 stop
American Airlines Logo
12:01 pm - 10:33 pmSJU-ONT
13h 32m2 stops
$386American Airlines
Find Deal
Tue, Sep 23 - Wed, Oct 1
Frontier Logo
7:44 pm - 3:19 pmONT-SJU
15h 35m2 stops
Frontier Logo
2:11 am - 11:10 amSJU-ONT
12h 59m2 stops
$415Frontier
Find Deal
Sun, Nov 2 - Wed, Nov 5
Frontier Logo
6:54 pm - 3:24 pmONT-SJU
17h 30m2 stops
Frontier Logo
9:19 pm - 12:37 pmSJU-ONT
18h 18m2 stops
$452Frontier
Find Deal
Thu, Oct 16 - Fri, Oct 24
Delta Logo
7:05 am - 10:00 pmONT-SJU
11h 55m1 stop
Delta Logo
2:26 pm - 10:23 pmSJU-ONT
10h 57m1 stop
$487Delta
Find Deal
Fri, Sep 19 - Thu, Sep 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
Nov 11
ONT7:00 amOntario
10h 00m
1 stop
SJU9:00 pmSan Juan Luis Munoz Marin Intl
Nov 20
SJU2:25 pmSan Juan Luis Munoz Marin Intl
10h 19m
1 stop
ONT8:44 pmOntario
$353
Find similar
United Airlines
Sep 24
ONT6:04 amOntario
11h 34m
1 stop
SJU8:38 pmSan Juan Luis Munoz Marin Intl
Sep 30
SJU1:05 amSan Juan Luis Munoz Marin Intl
14h 08m
2 stops
ONT12:13 pmOntario
$354
Find similar
United Airlines
Oct 15
ONT6:27 pmOntario
14h 33m
2 stops
SJU12:00 pmSan Juan Luis Munoz Marin Intl
Oct 20
SJU1:05 amSan Juan Luis Munoz Marin Intl
14h 46m
2 stops
ONT12:51 pmOntario
$398
Find similar

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

Our best American Airlines deals on Ontario to San Juan Luis Munoz Marin Intl Airport flight tickets
American Airlines
Feb 16
ONT3:05 pmOntario
9h 50m
1 stop
SJU4:55 amSan Juan Luis Munoz Marin Intl
Feb 26
SJU8:04 amSan Juan Luis Munoz Marin Intl
19h 39m
1 stop
ONT11:43 pmOntario
$360
Find similar
American Airlines
Sep 23
ONT10:35 pmOntario
14h 17m
1 stop
SJU3:52 pmSan Juan Luis Munoz Marin Intl
Oct 1
SJU12:01 pmSan Juan Luis Munoz Marin Intl
13h 32m
2 stops
ONT10:33 pmOntario
$386
Find similar
American Airlines
Feb 16
ONT8:04 pmOntario
11h 41m
2 stops
SJU11:45 amSan Juan Luis Munoz Marin Intl
Feb 26
SJU8:04 amSan Juan Luis Munoz Marin Intl
17h 53m
1 stop
ONT9:57 pmOntario
$411
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 August 21, 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

Sun 9/21

9:15 am-12:35 am

1 stop12h 20m

San Juan Luis Munoz Marin Intl

Sat 9/27

8:45 am-6:15 pm

1 stop12h 30m

$335

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Fri 9/19

12:28 pm-2:11 pm

2 stops22h 43m

San Juan Luis Munoz Marin Intl

Thu 9/25

3:22 pm-6:35 pm

1 stop30h 13m

$348

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 11/11

7:00 am-9:00 pm

1 stop10h 00m

San Juan Luis Munoz Marin Intl

Thu 11/20

2:25 pm-8:44 pm

1 stop10h 19m

$353

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 9/24

6:04 am-8:38 pm

1 stop11h 34m

San Juan Luis Munoz Marin Intl

Tue 9/30

1:05 am-12:13 pm

2 stops14h 08m

$354

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 2/16

3:05 pm-4:55 am

1 stop9h 50m

San Juan Luis Munoz Marin Intl

Thu 2/26

8:04 am-11:43 pm

1 stop19h 39m

$360

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 9/25

12:28 pm-6:45 pm

2 stops27h 17m

San Juan Luis Munoz Marin Intl

Thu 10/2

3:22 pm-6:35 pm

1 stop30h 13m

$367

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 9/23

10:35 pm-3:52 pm

1 stop14h 17m

San Juan Luis Munoz Marin Intl

Wed 10/1

12:01 pm-10:33 pm

2 stops13h 32m

$386

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Sun 11/2

7:44 pm-3:19 pm

2 stops15h 35m

San Juan Luis Munoz Marin Intl

Wed 11/5

2:11 am-11:10 am

2 stops12h 59m

$415

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 10/16

6:54 pm-3:24 pm

2 stops17h 30m

San Juan Luis Munoz Marin Intl

Fri 10/24

9:19 pm-12:37 pm

2 stops18h 18m

$452

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Fri 9/19

7:05 am-10:00 pm

1 stop11h 55m

San Juan Luis Munoz Marin Intl

Thu 9/25

2:26 pm-10:23 pm

1 stop10h 57m

$487

Flights are sorted by cheapest round-trip flights first.

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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 September is also cheap. Prices for this month can be found on momondo for an average of $483.

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 $602 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 $472 on momondo.

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

You could potentially save up to 24% 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 August 2025, prices for Ontario to San Juan Luis Munoz Marin Intl Airport flights are approximately 23% cheaper 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

Direct flights

None
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.
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  • 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 50m 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
3,207 reviews
Search Frontier flights
DeltaPriceFrom $355Free CancellationRating
7.9
7,981 reviews
Search Delta flights
American AirlinesPriceFrom $364Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $366Free CancellationRating
7.4
8,930 reviews
Search United Airlines flights
SouthwestPriceFrom $409Free CancellationRating
8.0
4,245 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
Caguas
Humacao
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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