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Cheap flights from Ontario to San Francisco from $154

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 8/14. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to San Francisco

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
6:08 am - 10:15 am
ONT
-
MRY
4h 07m
1 stop
United Airlines Logo
6:45 pm - 10:59 pm
MRY
-
ONT
4h 14m
1 stop
$279United Airlines
Fri, Aug 28 - Sun, Aug 30
United Airlines Logo
6:00 am - 11:10 am
ONT
-
MRY
5h 10m
1 stop
United Airlines Logo
8:00 am - 12:12 pm
MRY
-
ONT
4h 12m
1 stop
$339United Airlines
Sat, Jul 25 - Tue, Jul 28
United Airlines Logo
6:00 am - 11:10 am
ONT
-
MRY
5h 10m
1 stop
United Airlines Logo
5:00 am - 12:50 pm
MRY
-
ONT
7h 50m
1 stop
$349United Airlines
Wed, Aug 5 - Tue, Aug 11
United Airlines Logo
6:00 am - 11:10 am
ONT
-
MRY
5h 10m
1 stop
United Airlines Logo
12:00 pm - 3:29 pm
MRY
-
ONT
3h 29m
1 stop
$368United Airlines
Wed, Aug 5 - Sat, Aug 8
United Airlines Logo
4:20 pm - 9:52 pm
ONT
-
MRY
5h 32m
1 stop
United Airlines Logo
12:00 pm - 3:29 pm
MRY
-
ONT
3h 29m
1 stop
$374United Airlines
Sat, Jul 25 - Tue, Jul 28
United Airlines Logo
6:39 pm - 11:47 pm
ONT
-
MRY
5h 08m
1 stop
United Airlines Logo
8:00 am - 12:12 pm
MRY
-
ONT
4h 12m
1 stop
$378United Airlines
Mon, Jul 13 - Mon, Jul 20
United Airlines Logo
1:18 pm - 9:10 pm
ONT
-
MRY
7h 52m
1 stop
United Airlines Logo
8:00 am - 12:12 pm
MRY
-
ONT
4h 12m
1 stop
$379United Airlines
Sat, Jul 25 - Tue, Jul 28
United Airlines Logo
1:18 pm - 9:10 pm
ONT
-
MRY
7h 52m
1 stop
United Airlines Logo
12:00 pm - 6:33 pm
MRY
-
ONT
6h 33m
1 stop
$389United Airlines
Sat, Jul 25 - Sat, Aug 1
United Airlines Logo
1:18 pm - 9:10 pm
ONT
-
MRY
7h 52m
1 stop
United Airlines Logo
8:00 am - 12:12 pm
MRY
-
ONT
4h 12m
1 stop
$404United Airlines
Wed, Jul 22 - Tue, Jul 28
United Airlines Logo
6:39 pm - 11:47 pm
ONT
-
MRY
5h 08m
1 stop
United Airlines Logo
8:00 am - 12:12 pm
MRY
-
ONT
4h 12m
1 stop
$408United Airlines
Thu, Aug 6 - Mon, Aug 10

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United Airlines flights from Ontario to Monterey

Our best United Airlines deals on Ontario to Monterey flight tickets
United Airlines
Aug 28
ONT6:08 amOntario
4h 07m
1 stop
MRY10:15 amMonterey Regional
Aug 30
MRY6:45 pmMonterey Regional
4h 14m
1 stop
ONT10:59 pmOntario
$279
United Airlines
Jul 25
ONT6:00 amOntario
5h 10m
1 stop
MRY11:10 amMonterey Regional
Jul 28
MRY8:00 amMonterey Regional
4h 12m
1 stop
ONT12:12 pmOntario
$339
United Airlines
Jul 11
ONT4:20 pmOntario
5h 32m
1 stop
MRY9:52 pmMonterey Regional
Jul 18
MRY12:00 pmMonterey Regional
6h 33m
1 stop
ONT6:33 pmOntario
$344

Alaska Airlines flights from Ontario to Monterey

Our best Alaska Airlines deals on Ontario to Monterey flight tickets
Alaska Airlines
Sep 12
ONT12:12 pmOntario
11h 47m
2 stops
MRY11:59 pmMonterey Regional
Sep 14
MRY6:23 pmMonterey Regional
16h 53m
1 stop
ONT11:16 amOntario
$448
Alaska Airlines
Aug 19
ONT7:12 amOntario
10h 34m
2 stops
MRY5:46 pmMonterey Regional
Aug 21
MRY6:23 pmMonterey Regional
19h 46m
1 stop
ONT2:09 pmOntario
$508
Alaska Airlines
Aug 21
ONT6:02 amOntario
17h 57m
2 stops
MRY11:59 pmMonterey Regional
Aug 24
MRY6:23 pmMonterey Regional
16h 41m
1 stop
ONT11:04 amOntario
$518

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 July 9, 2026.
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

Cheapest round-trip
Quickest round-trip

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 8/28

6:08 am-10:15 am

1 stop4h 07m

Monterey Regional

Sun 8/30

6:45 pm-10:59 pm

1 stop4h 14m

$279

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 7/25

6:00 am-11:10 am

1 stop5h 10m

Monterey Regional

Tue 7/28

8:00 am-12:12 pm

1 stop4h 12m

$339

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Wed 8/5

6:00 am-11:10 am

1 stop5h 10m

Monterey Regional

Tue 8/11

5:00 am-12:50 pm

1 stop7h 50m

$349

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Wed 8/5

6:00 am-11:10 am

1 stop5h 10m

Monterey Regional

Sat 8/8

12:00 pm-3:29 pm

1 stop3h 29m

$368

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 7/25

4:20 pm-9:52 pm

1 stop5h 32m

Monterey Regional

Tue 7/28

12:00 pm-3:29 pm

1 stop3h 29m

$374

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Mon 7/13

6:39 pm-11:47 pm

1 stop5h 08m

Monterey Regional

Mon 7/20

8:00 am-12:12 pm

1 stop4h 12m

$378

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 7/25

1:18 pm-9:10 pm

1 stop7h 52m

Monterey Regional

Tue 7/28

8:00 am-12:12 pm

1 stop4h 12m

$379

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 7/25

1:18 pm-9:10 pm

1 stop7h 52m

Monterey Regional

Sat 8/1

12:00 pm-6:33 pm

1 stop6h 33m

$389

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Wed 7/22

1:18 pm-9:10 pm

1 stop7h 52m

Monterey Regional

Tue 7/28

8:00 am-12:12 pm

1 stop4h 12m

$404

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Thu 8/6

6:39 pm-11:47 pm

1 stop5h 08m

Monterey Regional

Mon 8/10

8:00 am-12:12 pm

1 stop4h 12m

$408

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 March is, on average, the cheapest month to fly to Monterey from Ontario, with most prices found around $0. If you’re not able to fly to Monterey in March, then January is your next best option. Flight prices from Ontario to Monterey during January average around $0.

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 $299. 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 $449.

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 in the evening. momondo users have found flights departing from Ontario to Monterey in the evening for as low as $295. 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 $364.

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

Fastest flight time

3h 16m

Direct flights

None
The fastest flight from Ontario to Monterey takes 3h 16m
There are no direct flights from Ontario to Monterey. There are no popular flight routes from Ontario to Monterey.
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Frequently asked questions about flying from Ontario to Monterey

  • 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 16m, 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 $264Free CancellationRating
7.4
9,948 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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