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Cheap flights from Ontario to San Juan from $185

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 12/5. 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
7:44 pm - 3:19 pmONT-SJU
15h 35m2 stops
Frontier Logo
9:00 am - 9:27 pmSJU-ONT
16h 27m2 stops
$340Frontier
Find Deal
Fri, Nov 14 - Wed, Nov 19
Frontier Logo
2:59 pm - 3:59 pmONT-SJU
21h 00m2 stops
Frontier Logo
1:59 am - 4:33 pmSJU-ONT
18h 34m2 stops
$346Frontier
Find Deal
Thu, Dec 4 - Sun, Dec 14
Frontier Logo
7:24 pm - 5:54 pmONT-SJU
18h 30m2 stops
Frontier Logo
4:14 pm - 6:27 amSJU-ONT
18h 13m2 stops
$351Frontier
Find Deal
Mon, Nov 10 - Sat, Nov 15
Frontier Logo
7:39 am - 1:32 amONT-SJU
13h 53m2 stops
Frontier Logo
3:59 am - 12:37 pmSJU-ONT
12h 38m2 stops
$357Frontier
Find Deal
Thu, Nov 6 - Fri, Nov 14
Southwest Logo
10:30 am - 12:35 amONT-SJU
10h 05m2 stops
Southwest Logo
8:55 am - 6:40 pmSJU-ONT
13h 45m2 stops
$390Southwest
Find Deal
Wed, Dec 3 - Tue, Dec 9
Multiple Airlines Logo
6:20 pm - 5:33 pmONT-SJU
19h 13m1 stop
Multiple Airlines Logo
7:01 pm - 11:59 pmSJU-ONT
32h 58m2 stops
$398Multiple Airlines
Find Deal
Mon, Jan 5 - Sat, Jan 10
United Airlines Logo
5:00 am - 6:25 pmONT-SJU
9h 25m1 stop
United Airlines Logo
2:25 pm - 8:45 pmSJU-ONT
10h 20m1 stop
$445United Airlines
Find Deal
Tue, Mar 3 - Thu, Mar 5
American Airlines Logo
6:46 am - 11:30 pmONT-SJU
12h 44m2 stops
American Airlines Logo
9:30 am - 8:24 pmSJU-ONT
14h 54m1 stop
$461American Airlines
Find Deal
Tue, Mar 3 - Thu, Mar 5
American Airlines Logo
6:10 am - 9:35 pmONT-SJU
11h 25m1 stop
American Airlines Logo
6:25 am - 6:20 pmSJU-ONT
15h 55m2 stops
$470American Airlines
Find Deal
Mon, Nov 10 - Sat, Nov 15
United Airlines Logo
6:00 am - 9:26 pmONT-SJU
11h 26m1 stop
United Airlines Logo
2:05 am - 5:41 pmSJU-ONT
19h 36m3 stops
$480United Airlines
Find Deal
Wed, Feb 11 - Tue, Feb 17

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
Nov 14
ONT7:44 pmOntario
15h 35m
2 stops
SJU3:19 pmSan Juan Luis Munoz Marin Intl
Nov 19
SJU9:00 amSan Juan Luis Munoz Marin Intl
16h 27m
2 stops
ONT9:27 pmOntario
$340
Find similar
Frontier
Dec 4
ONT2:59 pmOntario
21h 00m
2 stops
SJU3:59 pmSan Juan Luis Munoz Marin Intl
Dec 14
SJU1:59 amSan Juan Luis Munoz Marin Intl
18h 34m
2 stops
ONT4:33 pmOntario
$346
Find similar
Frontier
Nov 10
ONT7:24 pmOntario
18h 30m
2 stops
SJU5:54 pmSan Juan Luis Munoz Marin Intl
Nov 15
SJU4:14 pmSan Juan Luis Munoz Marin Intl
18h 13m
2 stops
ONT6:27 amOntario
$351
Find similar

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
Mar 3
ONT5:00 amOntario
9h 25m
1 stop
SJU6:25 pmSan Juan Luis Munoz Marin Intl
Mar 5
SJU2:25 pmSan Juan Luis Munoz Marin Intl
10h 20m
1 stop
ONT8:45 pmOntario
$445
Find similar
United Airlines
Feb 11
ONT6:00 amOntario
11h 26m
1 stop
SJU9:26 pmSan Juan Luis Munoz Marin Intl
Feb 17
SJU2:05 amSan Juan Luis Munoz Marin Intl
19h 36m
3 stops
ONT5:41 pmOntario
$480
Find similar
United Airlines
Nov 10
ONT5:05 amOntario
13h 17m
2 stops
SJU10:22 pmSan Juan Luis Munoz Marin Intl
Nov 14
SJU2:05 amSan Juan Luis Munoz Marin Intl
14h 28m
2 stops
ONT12:33 pmOntario
$560
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 October 27, 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 11/14

7:44 pm-3:19 pm

2 stops15h 35m

San Juan Luis Munoz Marin Intl

Wed 11/19

9:00 am-9:27 pm

2 stops16h 27m

$340

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 12/4

2:59 pm-3:59 pm

2 stops21h 00m

San Juan Luis Munoz Marin Intl

Sun 12/14

1:59 am-4:33 pm

2 stops18h 34m

$346

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 11/10

7:24 pm-5:54 pm

2 stops18h 30m

San Juan Luis Munoz Marin Intl

Sat 11/15

4:14 pm-6:27 am

2 stops18h 13m

$351

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Thu 11/6

7:39 am-1:32 am

2 stops13h 53m

San Juan Luis Munoz Marin Intl

Fri 11/14

3:59 am-12:37 pm

2 stops12h 38m

$357

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 12/3

10:30 am-12:35 am

2 stops10h 05m

San Juan Luis Munoz Marin Intl

Tue 12/9

8:55 am-6:40 pm

2 stops13h 45m

$390

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 1/5

6:20 pm-5:33 pm

1 stop19h 13m

San Juan Luis Munoz Marin Intl

Sat 1/10

7:01 pm-11:59 pm

2 stops32h 58m

$398

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 3/3

5:00 am-6:25 pm

1 stop9h 25m

San Juan Luis Munoz Marin Intl

Thu 3/5

2:25 pm-8:45 pm

1 stop10h 20m

$445

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Tue 3/3

6:46 am-11:30 pm

2 stops12h 44m

San Juan Luis Munoz Marin Intl

Thu 3/5

9:30 am-8:24 pm

1 stop14h 54m

$461

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Mon 11/10

6:10 am-9:35 pm

1 stop11h 25m

San Juan Luis Munoz Marin Intl

Sat 11/15

6:25 am-6:20 pm

2 stops15h 55m

$470

OntarioSan Juan

ONT - SJU

ONTSJU

Ontario

Wed 2/11

6:00 am-9:26 pm

1 stop11h 26m

San Juan Luis Munoz Marin Intl

Tue 2/17

2:05 am-5:41 pm

3 stops19h 36m

$480

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 April is also cheap. Prices for this month can be found on momondo for an average of $478.

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 $588 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 $411 on momondo.

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

As of October 2025, prices for Ontario to San Juan Luis Munoz Marin Intl Airport flights are approximately 17% 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

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 25m 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
3,122 reviews
Search Frontier flights
American AirlinesPriceFrom $365Free CancellationRating
7.2
11,033 reviews
Search American Airlines flights
United AirlinesPriceFrom $366Free CancellationRating
7.4
8,997 reviews
Search United Airlines flights
DeltaPriceFrom $375Free CancellationRating
7.9
7,996 reviews
Search Delta flights
SouthwestPriceFrom $409Free CancellationRating
8.0
4,236 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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