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Cheap flights from Ontario to San Francisco from $201

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 Francisco departing on 3/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

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United Airlines Logo
6:00 am - 10:33 amONT-MRY
4h 33m1 stop
United Airlines Logo
2:33 pm - 5:37 pmMRY-ONT
3h 04m1 stop
$279United Airlines
Find Deal
Sat, Dec 6 - Mon, Dec 8
United Airlines Logo
1:29 pm - 9:07 pmONT-MRY
7h 38m1 stop
United Airlines Logo
5:00 am - 12:33 pmMRY-ONT
7h 33m1 stop
$319United Airlines
Find Deal
Fri, Nov 14 - Sat, Nov 15
United Airlines Logo
6:38 pm - 9:58 pmONT-MRY
3h 20m1 stop
United Airlines Logo
2:30 pm - 5:34 pmMRY-ONT
3h 04m1 stop
$327United Airlines
Find Deal
Tue, Nov 18 - Sat, Nov 22
United Airlines Logo
1:34 pm - 9:12 pmONT-MRY
7h 38m1 stop
United Airlines Logo
5:05 am - 12:32 pmMRY-ONT
7h 27m1 stop
$329United Airlines
Find Deal
Fri, Dec 5 - Sun, Dec 7
Alaska Airlines Logo
6:00 am - 5:30 pmONT-MRY
11h 30m1 stop
Alaska Airlines Logo
6:07 pm - 1:06 pmMRY-ONT
18h 59m2 stops
$351Alaska Airlines
Find Deal
Fri, Jan 9 - Mon, Jan 12
United Airlines Logo
6:00 am - 10:33 amONT-MRY
4h 33m1 stop
United Airlines Logo
5:00 am - 12:28 pmMRY-ONT
7h 28m1 stop
$354United Airlines
Find Deal
Fri, Nov 14 - Sun, Nov 16
United Airlines Logo
6:00 am - 10:33 amONT-MRY
4h 33m1 stop
United Airlines Logo
2:30 pm - 7:41 pmMRY-ONT
5h 11m1 stop
$359United Airlines
Find Deal
Sat, Nov 22 - Mon, Dec 1
Alaska Airlines Logo
7:00 am - 5:30 pmONT-MRY
10h 30m2 stops
Alaska Airlines Logo
6:07 pm - 1:06 pmMRY-ONT
18h 59m2 stops
$363Alaska Airlines
Find Deal
Fri, Jan 9 - Mon, Jan 12
Alaska Airlines Logo
7:33 pm - 10:46 amONT-MRY
15h 13m1 stop
Alaska Airlines Logo
11:23 am - 9:50 amMRY-ONT
22h 27m1 stop
$442Alaska Airlines
Find Deal
Mon, Dec 15 - Wed, Dec 17
Multiple Airlines Logo
6:00 am - 10:29 amONT-MRY
4h 29m1 stop
Multiple Airlines Logo
6:00 am - 5:03 pmMRY-ONT
11h 03m2 stops
$526Multiple Airlines
Find Deal
Mon, Dec 29 - Wed, Jan 7

United Airlines flights from Ontario to Monterey

Our best United Airlines deals on Ontario to Monterey flight tickets
United Airlines
Dec 6
ONT6:00 amOntario
4h 33m
1 stop
MRY10:33 amMonterey Regional
Dec 8
MRY2:33 pmMonterey Regional
3h 04m
1 stop
ONT5:37 pmOntario
$279
Find similar
United Airlines
Nov 14
ONT1:29 pmOntario
7h 38m
1 stop
MRY9:07 pmMonterey Regional
Nov 15
MRY5:00 amMonterey Regional
7h 33m
1 stop
ONT12:33 pmOntario
$319
Find similar
United Airlines
Nov 18
ONT6:38 pmOntario
3h 20m
1 stop
MRY9:58 pmMonterey Regional
Nov 22
MRY2:30 pmMonterey Regional
3h 04m
1 stop
ONT5:34 pmOntario
$327
Find similar

Alaska Airlines flights from Ontario to Monterey

Our best Alaska Airlines deals on Ontario to Monterey flight tickets
Alaska Airlines
Jan 9
ONT6:00 amOntario
11h 30m
1 stop
MRY5:30 pmMonterey Regional
Jan 12
MRY6:07 pmMonterey Regional
18h 59m
2 stops
ONT1:06 pmOntario
$351
Find similar
Alaska Airlines
Jan 9
ONT7:00 amOntario
10h 30m
2 stops
MRY5:30 pmMonterey Regional
Jan 12
MRY6:07 pmMonterey Regional
18h 59m
2 stops
ONT1:06 pmOntario
$363
Find similar
Alaska Airlines
Dec 15
ONT7:33 pmOntario
15h 13m
1 stop
MRY10:46 amMonterey Regional
Dec 17
MRY11:23 amMonterey Regional
22h 27m
1 stop
ONT9:50 amOntario
$442
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Monterey 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 November 2, 2025.
Use the filters below to find and compare flights from Ontario to Monterey that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 12/6

6:00 am-10:33 am

1 stop4h 33m

Monterey Regional

Mon 12/8

2:33 pm-5:37 pm

1 stop3h 04m

$279

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 11/14

1:29 pm-9:07 pm

1 stop7h 38m

Monterey Regional

Sat 11/15

5:00 am-12:33 pm

1 stop7h 33m

$319

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Tue 11/18

6:38 pm-9:58 pm

1 stop3h 20m

Monterey Regional

Sat 11/22

2:30 pm-5:34 pm

1 stop3h 04m

$327

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 12/5

1:34 pm-9:12 pm

1 stop7h 38m

Monterey Regional

Sun 12/7

5:05 am-12:32 pm

1 stop7h 27m

$329

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 1/9

6:00 am-5:30 pm

1 stop11h 30m

Monterey Regional

Mon 1/12

6:07 pm-1:06 pm

2 stops18h 59m

$351

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 11/14

6:00 am-10:33 am

1 stop4h 33m

Monterey Regional

Sun 11/16

5:00 am-12:28 pm

1 stop7h 28m

$354

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 11/22

6:00 am-10:33 am

1 stop4h 33m

Monterey Regional

Mon 12/1

2:30 pm-7:41 pm

1 stop5h 11m

$359

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 1/9

7:00 am-5:30 pm

2 stops10h 30m

Monterey Regional

Mon 1/12

6:07 pm-1:06 pm

2 stops18h 59m

$363

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Mon 12/15

7:33 pm-10:46 am

1 stop15h 13m

Monterey Regional

Wed 12/17

11:23 am-9:50 am

1 stop22h 27m

$442

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Mon 12/29

6:00 am-10:29 am

1 stop4h 29m

Monterey Regional

Wed 1/7

6:00 am-5:03 pm

2 stops11h 03m

$526

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 Francisco from

How to get the cheapest flight ticket from Ontario to Monterey

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 Monterey?

The month of July is, on average, the cheapest month to fly to Monterey from Ontario, with most prices found around $278. If you’re not able to fly to Monterey in July, then April is your next best option. Flight prices from Ontario to Monterey during April average around $318.

What is the cheapest day to depart on your flight to Monterey?

The cheapest day to depart from Ontario to Monterey is on a Saturday. Travelers who choose to depart for Monterey on a Saturday will often find tickets for as low as $296. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to Monterey for around $437.

What is the cheapest time of day to depart on your flight to Monterey?

According to our data, the cheapest time of day to fly to Monterey is at noon. momondo users have found flights departing from Ontario to Monterey at noon for as low as $65. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $332.

When to book flights from Ontario to Monterey

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

Cheap Ontario to Monterey (ONT to MRY) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Monterey

Direct flights

None
There are no direct flights from Ontario to Monterey. There are no popular flight routes from Ontario to Monterey.
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  • How far is Ontario to Monterey Regional by plane?

    There are 296.3 mi between Ontario and Monterey Regional. Flights usually cover this in 3h 20m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Ontario Airport to Monterey Regional Airport?

    Prices for flights from Ontario Airport to Monterey Regional Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to Monterey Regional Airport?

  • How old do you have to be to fly from Ontario Airport to Monterey Regional Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Monterey Regional Airport.

  • What documentation or ID do you need to fly to Monterey Regional Airport?

    The travel and health documents you'll need for your trip to Monterey Regional Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Monterey Regional Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Ontario to Monterey?

Best airlines flying from Ontario to Monterey

Compare and see reviews for airlines that fly from Ontario to Monterey with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $278Free CancellationRating
7.4
8,997 reviews
Search United Airlines flights

Why use momondo?

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

Finding the right flight to Monterey from Ontario is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Monterey quick and easy, saving you time and money.

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

momondo does allow users to show only those flights to Monterey from Ontario which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Ontario to Monterey?

Once all potential Ontario to Monterey flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Of course. momondo tracks the price of Ontario to Monterey 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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