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Cheap flights from Ontario to San Francisco from $126

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 4/15. 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 Francisco

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
6:00 am - 11:16 am
ONT
-
MRY
5h 16m
1 stop
United Airlines Logo
8:00 am - 12:22 pm
MRY
-
ONT
4h 22m
1 stop
$299United Airlines
Sat, May 2 - Sun, May 3
United Airlines Logo
1:27 pm - 6:00 pm
ONT
-
MRY
4h 33m
1 stop
United Airlines Logo
7:00 pm - 10:45 pm
MRY
-
ONT
3h 45m
1 stop
$304United Airlines
Fri, Apr 3 - Fri, Apr 17
United Airlines Logo
6:45 pm - 10:19 pm
ONT
-
MRY
3h 34m
1 stop
United Airlines Logo
7:00 pm - 10:45 pm
MRY
-
ONT
3h 45m
1 stop
$309United Airlines
Fri, Apr 3 - Mon, Apr 6
United Airlines Logo
1:27 pm - 6:00 pm
ONT
-
MRY
4h 33m
1 stop
United Airlines Logo
7:00 pm - 10:45 pm
MRY
-
ONT
3h 45m
1 stop
$314United Airlines
Fri, Apr 3 - Fri, Apr 17
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, Jun 27 - Mon, Jun 29
United Airlines Logo
6:45 pm - 10:19 pm
ONT
-
MRY
3h 34m
1 stop
United Airlines Logo
7:00 pm - 10:45 pm
MRY
-
ONT
3h 45m
1 stop
$359United Airlines
Fri, Apr 10 - Mon, Apr 13
United Airlines Logo
6:49 pm - 10:19 pm
ONT
-
MRY
3h 30m
1 stop
United Airlines Logo
12:02 pm - 5:47 pm
MRY
-
ONT
5h 45m
1 stop
$361United Airlines
Thu, Apr 9 - Mon, Apr 13
United Airlines Logo
1:30 pm - 6:08 pm
ONT
-
MRY
4h 38m
1 stop
United Airlines Logo
12:05 pm - 5:52 pm
MRY
-
ONT
5h 47m
1 stop
$369United Airlines
Sat, May 2 - Wed, May 6
United Airlines Logo
6:49 pm - 10:19 pm
ONT
-
MRY
3h 30m
1 stop
United Airlines Logo
7:00 pm - 10:45 pm
MRY
-
ONT
3h 45m
1 stop
$371United Airlines
Thu, Apr 16 - Mon, Apr 20
United Airlines Logo
6:00 am - 11:27 am
ONT
-
MRY
5h 27m
1 stop
United Airlines Logo
7:00 pm - 10:45 pm
MRY
-
ONT
3h 45m
1 stop
$376United Airlines
Fri, Apr 10 - Mon, Apr 13

United Airlines flights from Ontario to Monterey

Our best United Airlines deals on Ontario to Monterey flight tickets
United Airlines
May 2
ONT6:00 amOntario
5h 16m
1 stop
MRY11:16 amMonterey Regional
May 3
MRY8:00 amMonterey Regional
4h 22m
1 stop
ONT12:22 pmOntario
$299
United Airlines
Apr 3
ONT1:27 pmOntario
4h 33m
1 stop
MRY6:00 pmMonterey Regional
Apr 17
MRY7:00 pmMonterey Regional
3h 45m
1 stop
ONT10:45 pmOntario
$304
United Airlines
Apr 3
ONT6:45 pmOntario
3h 34m
1 stop
MRY10:19 pmMonterey Regional
Apr 6
MRY7:00 pmMonterey Regional
3h 45m
1 stop
ONT10:45 pmOntario
$309

Alaska Airlines flights from Ontario to Monterey

Our best Alaska Airlines deals on Ontario to Monterey flight tickets
Alaska Airlines
May 2
ONT7:00 amOntario
9h 07m
2 stops
MRY4:07 pmMonterey Regional
May 6
MRY4:44 pmMonterey Regional
21h 48m
1 stop
ONT2:32 pmOntario
$443
Alaska Airlines
May 6
ONT6:00 amOntario
10h 07m
1 stop
MRY4:07 pmMonterey Regional
May 8
MRY4:44 pmMonterey Regional
17h 01m
1 stop
ONT9:45 amOntario
$470
Alaska Airlines
May 2
ONT7:00 amOntario
9h 07m
2 stops
MRY4:07 pmMonterey Regional
May 6
MRY4:44 pmMonterey Regional
5h 48m
1 stop
ONT10:32 pmOntario
$492

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 March 23, 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

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 5/2

6:00 am-11:16 am

1 stop5h 16m

Monterey Regional

Sun 5/3

8:00 am-12:22 pm

1 stop4h 22m

$299

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 4/3

1:27 pm-6:00 pm

1 stop4h 33m

Monterey Regional

Fri 4/17

7:00 pm-10:45 pm

1 stop3h 45m

$304

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 4/3

6:45 pm-10:19 pm

1 stop3h 34m

Monterey Regional

Mon 4/6

7:00 pm-10:45 pm

1 stop3h 45m

$309

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 4/3

1:27 pm-6:00 pm

1 stop4h 33m

Monterey Regional

Fri 4/17

7:00 pm-10:45 pm

1 stop3h 45m

$314

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 6/27

6:00 am-11:10 am

1 stop5h 10m

Monterey Regional

Mon 6/29

8:00 am-12:12 pm

1 stop4h 12m

$339

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 4/10

6:45 pm-10:19 pm

1 stop3h 34m

Monterey Regional

Mon 4/13

7:00 pm-10:45 pm

1 stop3h 45m

$359

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Thu 4/9

6:49 pm-10:19 pm

1 stop3h 30m

Monterey Regional

Mon 4/13

12:02 pm-5:47 pm

1 stop5h 45m

$361

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 5/2

1:30 pm-6:08 pm

1 stop4h 38m

Monterey Regional

Wed 5/6

12:05 pm-5:52 pm

1 stop5h 47m

$369
Quickest round-trip

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Thu 4/16

6:49 pm-10:19 pm

1 stop3h 30m

Monterey Regional

Mon 4/20

7:00 pm-10:45 pm

1 stop3h 45m

$371

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 4/10

6:00 am-11:27 am

1 stop5h 27m

Monterey Regional

Mon 4/13

7:00 pm-10:45 pm

1 stop3h 45m

$376

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 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 $443.

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 $285. 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 $343.

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 10m

Direct flights

None
The fastest flight from Ontario to Monterey takes 3h 10m
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 10m, 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
9,460 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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