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Cheap flights from Ontario to San Francisco from $171

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 9/22. 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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0 bags

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Cheap round-trip flights

Multiple Airlines Logo
6:00 am - 8:29 pmONT-MRY
14h 29m1 stop
Multiple Airlines Logo
9:19 pm - 8:42 pmMRY-ONT
23h 23m1 stop
$216Multiple Airlines
Find Deal
Mon, Oct 6 - Mon, Oct 13
United Airlines Logo
6:51 pm - 9:38 pmONT-MRY
2h 47m1 stop
United Airlines Logo
6:15 am - 12:13 pmMRY-ONT
5h 58m1 stop
$240United Airlines
Find Deal
Sat, Oct 4 - Mon, Oct 6
Multiple Airlines Logo
6:00 am - 8:29 pmONT-MRY
14h 29m1 stop
Multiple Airlines Logo
9:19 pm - 11:50 pmMRY-ONT
26h 31m2 stops
$241Multiple Airlines
Find Deal
Mon, Oct 6 - Mon, Oct 13
United Airlines Logo
6:36 pm - 9:38 pmONT-MRY
3h 02m1 stop
United Airlines Logo
6:15 am - 12:13 pmMRY-ONT
5h 58m1 stop
$279United Airlines
Find Deal
Thu, Oct 16 - Sat, Oct 25
United Airlines Logo
6:51 pm - 9:38 pmONT-MRY
2h 47m1 stop
United Airlines Logo
6:15 am - 12:13 pmMRY-ONT
5h 58m1 stop
$284United Airlines
Find Deal
Sat, Oct 4 - Tue, Oct 7
United Airlines Logo
6:36 pm - 9:38 pmONT-MRY
3h 02m1 stop
United Airlines Logo
6:15 am - 12:13 pmMRY-ONT
5h 58m1 stop
$289United Airlines
Find Deal
Tue, Sep 30 - Sat, Oct 4
United Airlines Logo
6:36 pm - 9:38 pmONT-MRY
3h 02m1 stop
United Airlines Logo
6:15 am - 12:13 pmMRY-ONT
5h 58m1 stop
$314United Airlines
Find Deal
Thu, Oct 16 - Mon, Oct 20
Alaska Airlines Logo
6:00 am - 11:34 pmONT-MRY
17h 34m2 stops
Alaska Airlines Logo
11:23 am - 6:32 pmMRY-ONT
7h 09m1 stop
$368Alaska Airlines
Find Deal
Sat, Dec 13 - Tue, Dec 16
American Airlines Logo
1:00 pm - 9:19 amONT-MRY
20h 19m1 stop
American Airlines Logo
7:29 pm - 9:19 amMRY-ONT
13h 50m1 stop
$394American Airlines
Find Deal
Fri, Oct 24 - Sun, Oct 26
Alaska Airlines Logo
1:31 pm - 7:15 pmONT-MRY
5h 44m1 stop
Alaska Airlines Logo
7:57 pm - 12:37 pmMRY-ONT
16h 40m1 stop
$418Alaska Airlines
Find Deal
Wed, Oct 22 - Fri, Oct 24

Alaska Airlines flights from Ontario to Monterey

Our best Alaska Airlines deals on Ontario to Monterey flight tickets
Alaska Airlines
Dec 13
ONT6:00 amOntario
17h 34m
2 stops
MRY11:34 pmMonterey Regional
Dec 16
MRY11:23 amMonterey Regional
7h 09m
1 stop
ONT6:32 pmOntario
$368
Find similar
Alaska Airlines
Oct 22
ONT1:31 pmOntario
5h 44m
1 stop
MRY7:15 pmMonterey Regional
Oct 24
MRY7:57 pmMonterey Regional
16h 40m
1 stop
ONT12:37 pmOntario
$418
Find similar
Alaska Airlines
Oct 28
ONT4:11 pmOntario
18h 26m
1 stop
MRY10:37 amMonterey Regional
Oct 31
MRY11:14 amMonterey Regional
9h 39m
1 stop
ONT8:53 pmOntario
$422
Find similar

United Airlines flights from Ontario to Monterey

Our best United Airlines deals on Ontario to Monterey flight tickets
United Airlines
Oct 4
ONT6:51 pmOntario
2h 47m
1 stop
MRY9:38 pmMonterey Regional
Oct 6
MRY6:15 amMonterey Regional
5h 58m
1 stop
ONT12:13 pmOntario
$240
Find similar
United Airlines
Oct 16
ONT6:36 pmOntario
3h 02m
1 stop
MRY9:38 pmMonterey Regional
Oct 25
MRY6:15 amMonterey Regional
5h 58m
1 stop
ONT12:13 pmOntario
$279
Find similar
United Airlines
Oct 4
ONT6:51 pmOntario
2h 47m
1 stop
MRY9:38 pmMonterey Regional
Oct 7
MRY6:15 amMonterey Regional
5h 58m
1 stop
ONT12:13 pmOntario
$284
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 September 16, 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

Mon 10/6

6:00 am-8:29 pm

1 stop14h 29m

Monterey Regional

Mon 10/13

9:19 pm-8:42 pm

1 stop23h 23m

$216

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 10/4

6:51 pm-9:38 pm

1 stop2h 47m

Monterey Regional

Mon 10/6

6:15 am-12:13 pm

1 stop5h 58m

$240

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Mon 10/6

6:00 am-8:29 pm

1 stop14h 29m

Monterey Regional

Mon 10/13

9:19 pm-11:50 pm

2 stops26h 31m

$241

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Thu 10/16

6:36 pm-9:38 pm

1 stop3h 02m

Monterey Regional

Sat 10/25

6:15 am-12:13 pm

1 stop5h 58m

$279

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 10/4

6:51 pm-9:38 pm

1 stop2h 47m

Monterey Regional

Tue 10/7

6:15 am-12:13 pm

1 stop5h 58m

$284

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Tue 9/30

6:36 pm-9:38 pm

1 stop3h 02m

Monterey Regional

Sat 10/4

6:15 am-12:13 pm

1 stop5h 58m

$289

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Thu 10/16

6:36 pm-9:38 pm

1 stop3h 02m

Monterey Regional

Mon 10/20

6:15 am-12:13 pm

1 stop5h 58m

$314

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 12/13

6:00 am-11:34 pm

2 stops17h 34m

Monterey Regional

Tue 12/16

11:23 am-6:32 pm

1 stop7h 09m

$368

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 10/24

1:00 pm-9:19 am

1 stop20h 19m

Monterey Regional

Sun 10/26

7:29 pm-9:19 am

1 stop13h 50m

$394

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Wed 10/22

1:31 pm-7:15 pm

1 stop5h 44m

Monterey Regional

Fri 10/24

7:57 pm-12:37 pm

1 stop16h 40m

$418

Flights are sorted by cheapest round-trip flights 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 $285. 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 $335.

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.
Search flight deals

  • How far is Ontario to Monterey Regional by plane?

    There are 296.3 mi between Ontario and Monterey Regional. Flights usually cover this in 2h 47m, 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
8,924 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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