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Cheap flights from Ontario to San Francisco from $95

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 2/25. 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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Find the cheapest flights from Ontario to San Francisco

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
7:17 pm - 3:29 pm
ONT
-
MRY
20h 12m
1 stop
Multiple Airlines Logo
4:19 pm - 5:48 pm
MRY
-
ONT
25h 29m
1 stop
$182Multiple Airlines
Wed, Feb 18 - Sun, Feb 22
United Airlines Logo
1:40 pm - 6:00 pm
ONT
-
MRY
4h 20m
1 stop
United Airlines Logo
7:00 pm - 10:57 pm
MRY
-
ONT
3h 57m
1 stop
$239United Airlines
Wed, Mar 18 - Sat, Mar 21
United Airlines Logo
1:40 pm - 6:00 pm
ONT
-
MRY
4h 20m
1 stop
United Airlines Logo
7:00 pm - 10:57 pm
MRY
-
ONT
3h 57m
1 stop
$296United Airlines
Sat, Mar 7 - Mon, Mar 9
United Airlines Logo
1:40 pm - 6:00 pm
ONT
-
MRY
4h 20m
1 stop
United Airlines Logo
7:00 pm - 10:57 pm
MRY
-
ONT
3h 57m
1 stop
$299United Airlines
Thu, Mar 5 - Sun, Mar 8
United Airlines Logo
1:50 pm - 5:20 pm
ONT
-
MRY
3h 30m
1 stop
United Airlines Logo
6:40 am - 12:38 pm
MRY
-
ONT
5h 58m
1 stop
$309United Airlines
Thu, Feb 19 - Mon, Feb 23
United Airlines Logo
1:53 pm - 5:20 pm
ONT
-
MRY
3h 27m
1 stop
United Airlines Logo
6:03 pm - 10:57 pm
MRY
-
ONT
4h 54m
1 stop
$319United Airlines
Sat, Feb 14 - Wed, Feb 18
Multiple Airlines Logo
7:30 am - 3:29 pm
ONT
-
MRY
31h 59m
2 stops
Multiple Airlines Logo
4:19 pm - 1:11 pm
MRY
-
ONT
20h 52m
1 stop
$322Multiple Airlines
Wed, Feb 18 - Sun, Feb 22
United Airlines Logo
1:50 pm - 5:20 pm
ONT
-
MRY
3h 30m
1 stop
United Airlines Logo
5:00 am - 12:43 pm
MRY
-
ONT
7h 43m
1 stop
$339United Airlines
Wed, Feb 25 - Sat, Feb 28
Alaska Airlines Logo
6:14 am - 11:43 pm
ONT
-
MRY
17h 29m
2 stops
Alaska Airlines Logo
6:00 am - 10:44 pm
MRY
-
ONT
16h 44m
2 stops
$343Alaska Airlines
Tue, Mar 3 - Tue, Mar 10
Alaska Airlines Logo
6:14 am - 6:36 pm
ONT
-
MRY
12h 22m
1 stop
Alaska Airlines Logo
7:13 pm - 11:08 am
MRY
-
ONT
15h 55m
1 stop
$358Alaska Airlines
Mon, Mar 9 - Fri, Mar 13

United Airlines flights from Ontario to Monterey

Our best United Airlines deals on Ontario to Monterey flight tickets
United Airlines
Mar 18
ONT1:40 pmOntario
4h 20m
1 stop
MRY6:00 pmMonterey Regional
Mar 21
MRY7:00 pmMonterey Regional
3h 57m
1 stop
ONT10:57 pmOntario
$239
United Airlines
Mar 7
ONT1:40 pmOntario
4h 20m
1 stop
MRY6:00 pmMonterey Regional
Mar 9
MRY7:00 pmMonterey Regional
3h 57m
1 stop
ONT10:57 pmOntario
$296
United Airlines
Mar 5
ONT1:40 pmOntario
4h 20m
1 stop
MRY6:00 pmMonterey Regional
Mar 8
MRY7:00 pmMonterey Regional
3h 57m
1 stop
ONT10:57 pmOntario
$299

Alaska Airlines flights from Ontario to Monterey

Our best Alaska Airlines deals on Ontario to Monterey flight tickets
Alaska Airlines
Mar 3
ONT6:14 amOntario
17h 29m
2 stops
MRY11:43 pmMonterey Regional
Mar 10
MRY6:00 amMonterey Regional
16h 44m
2 stops
ONT10:44 pmOntario
$343
Alaska Airlines
Mar 9
ONT6:14 amOntario
12h 22m
1 stop
MRY6:36 pmMonterey Regional
Mar 13
MRY7:13 pmMonterey Regional
15h 55m
1 stop
ONT11:08 amOntario
$358
Alaska Airlines
Mar 6
ONT4:02 pmOntario
22h 04m
2 stops
MRY2:06 pmMonterey Regional
Mar 9
MRY7:13 pmMonterey Regional
19h 55m
1 stop
ONT3:08 pmOntario
$396

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 February 5, 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

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Wed 2/18

7:17 pm-3:29 pm

1 stop20h 12m

Monterey Regional

Sun 2/22

4:19 pm-5:48 pm

1 stop25h 29m

$182

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Wed 3/18

1:40 pm-6:00 pm

1 stop4h 20m

Monterey Regional

Sat 3/21

7:00 pm-10:57 pm

1 stop3h 57m

$239

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 3/7

1:40 pm-6:00 pm

1 stop4h 20m

Monterey Regional

Mon 3/9

7:00 pm-10:57 pm

1 stop3h 57m

$296

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Thu 3/5

1:40 pm-6:00 pm

1 stop4h 20m

Monterey Regional

Sun 3/8

7:00 pm-10:57 pm

1 stop3h 57m

$299

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Thu 2/19

1:50 pm-5:20 pm

1 stop3h 30m

Monterey Regional

Mon 2/23

6:40 am-12:38 pm

1 stop5h 58m

$309

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 2/14

1:53 pm-5:20 pm

1 stop3h 27m

Monterey Regional

Wed 2/18

6:03 pm-10:57 pm

1 stop4h 54m

$319

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Wed 2/18

7:30 am-3:29 pm

2 stops31h 59m

Monterey Regional

Sun 2/22

4:19 pm-1:11 pm

1 stop20h 52m

$322

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Wed 2/25

1:50 pm-5:20 pm

1 stop3h 30m

Monterey Regional

Sat 2/28

5:00 am-12:43 pm

1 stop7h 43m

$339

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Tue 3/3

6:14 am-11:43 pm

2 stops17h 29m

Monterey Regional

Tue 3/10

6:00 am-10:44 pm

2 stops16h 44m

$343

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Mon 3/9

6:14 am-6:36 pm

1 stop12h 22m

Monterey Regional

Fri 3/13

7:13 pm-11:08 am

1 stop15h 55m

$358

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 November is your next best option. Flight prices from Ontario to Monterey during November average around $314.

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 $288. When flying out on a Monday, 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 in the evening. momondo users have found flights departing from Ontario to Monterey in the evening for as low as $273. 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

Fastest flight time

3h 24m

Direct flights

None
The fastest flight from Ontario to Monterey takes 3h 24m
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 3h 24m, 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
9,240 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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