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Cheap flights from Ontario to San Francisco from $187

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 9/27. 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

United Airlines Logo
6:00 am - 10:33 amONT-MRY
4h 33m1 stop
United Airlines Logo
7:00 am - 12:17 pmMRY-ONT
5h 17m1 stop
$279United Airlines
Find Deal
Sat, Nov 15 - Tue, Dec 2
United Airlines Logo
6:39 pm - 11:44 pmONT-MRY
5h 05m1 stop
United Airlines Logo
2:20 pm - 5:37 pmMRY-ONT
3h 17m1 stop
$284United Airlines
Find Deal
Wed, Aug 13 - Wed, Aug 20
United Airlines Logo
6:10 am - 11:05 amONT-MRY
4h 55m1 stop
United Airlines Logo
2:20 pm - 5:37 pmMRY-ONT
3h 17m1 stop
$289United Airlines
Find Deal
Tue, Aug 12 - Wed, Aug 20
United Airlines Logo
6:00 am - 10:31 amONT-MRY
4h 31m1 stop
United Airlines Logo
6:30 am - 12:13 pmMRY-ONT
5h 43m1 stop
$314United Airlines
Find Deal
Sat, Sep 20 - Tue, Sep 23
Alaska Airlines Logo
4:11 pm - 10:37 amONT-MRY
18h 26m1 stop
Alaska Airlines Logo
8:05 pm - 9:40 amMRY-ONT
13h 35m1 stop
$322Alaska Airlines
Find Deal
Tue, Nov 18 - Fri, Nov 21
United Airlines Logo
6:00 am - 10:31 amONT-MRY
4h 31m1 stop
United Airlines Logo
10:00 am - 5:37 pmMRY-ONT
7h 37m1 stop
$332United Airlines
Find Deal
Sat, Aug 23 - Sat, Aug 30
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
$352Alaska Airlines
Find Deal
Fri, Oct 10 - Fri, Oct 17
Alaska Airlines Logo
7:10 am - 7:14 pmONT-MRY
12h 04m2 stops
Alaska Airlines Logo
7:56 pm - 10:44 amMRY-ONT
14h 48m1 stop
$371Alaska Airlines
Find Deal
Sat, Sep 6 - Mon, Sep 8
American Airlines Logo
1:10 pm - 12:16 pmONT-MRY
23h 06m1 stop
American Airlines Logo
6:09 am - 11:56 amMRY-ONT
29h 47m1 stop
$401American Airlines
Find Deal
Fri, Sep 26 - Tue, Sep 30
American Airlines Logo
12:22 pm - 9:14 amONT-MRY
20h 52m1 stop
American Airlines Logo
7:05 pm - 11:32 amMRY-ONT
16h 27m1 stop
$421American Airlines
Find Deal
Fri, Aug 29 - Mon, Sep 1

United Airlines flights from Ontario to Monterey

Our best United Airlines deals on Ontario to Monterey flight tickets
United Airlines
Nov 15
ONT6:00 amOntario
4h 33m
1 stop
MRY10:33 amMonterey Regional
Dec 2
MRY7:00 amMonterey Regional
5h 17m
1 stop
ONT12:17 pmOntario
$279
Find similar
United Airlines
Aug 13
ONT6:39 pmOntario
5h 05m
1 stop
MRY11:44 pmMonterey Regional
Aug 20
MRY2:20 pmMonterey Regional
3h 17m
1 stop
ONT5:37 pmOntario
$284
Find similar
United Airlines
Aug 12
ONT6:10 amOntario
4h 55m
1 stop
MRY11:05 amMonterey Regional
Aug 20
MRY2:20 pmMonterey Regional
3h 17m
1 stop
ONT5:37 pmOntario
$289
Find similar

Alaska Airlines flights from Ontario to Monterey

Our best Alaska Airlines deals on Ontario to Monterey flight tickets
Alaska Airlines
Nov 18
ONT4:11 pmOntario
18h 26m
1 stop
MRY10:37 amMonterey Regional
Nov 21
MRY8:05 pmMonterey Regional
13h 35m
1 stop
ONT9:40 amOntario
$322
Find similar
Alaska Airlines
Oct 10
ONT1:31 pmOntario
5h 44m
1 stop
MRY7:15 pmMonterey Regional
Oct 17
MRY7:57 pmMonterey Regional
16h 40m
1 stop
ONT12:37 pmOntario
$352
Find similar
Alaska Airlines
Sep 6
ONT7:10 amOntario
12h 04m
2 stops
MRY7:14 pmMonterey Regional
Sep 8
MRY7:56 pmMonterey Regional
14h 48m
1 stop
ONT10:44 amOntario
$371
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 July 31, 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 11/15

6:00 am-10:33 am

1 stop4h 33m

Monterey Regional

Tue 12/2

7:00 am-12:17 pm

1 stop5h 17m

$279

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Wed 8/13

6:39 pm-11:44 pm

1 stop5h 05m

Monterey Regional

Wed 8/20

2:20 pm-5:37 pm

1 stop3h 17m

$284

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Tue 8/12

6:10 am-11:05 am

1 stop4h 55m

Monterey Regional

Wed 8/20

2:20 pm-5:37 pm

1 stop3h 17m

$289

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 9/20

6:00 am-10:31 am

1 stop4h 31m

Monterey Regional

Tue 9/23

6:30 am-12:13 pm

1 stop5h 43m

$314

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Tue 11/18

4:11 pm-10:37 am

1 stop18h 26m

Monterey Regional

Fri 11/21

8:05 pm-9:40 am

1 stop13h 35m

$322

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 8/23

6:00 am-10:31 am

1 stop4h 31m

Monterey Regional

Sat 8/30

10:00 am-5:37 pm

1 stop7h 37m

$332

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 10/10

1:31 pm-7:15 pm

1 stop5h 44m

Monterey Regional

Fri 10/17

7:57 pm-12:37 pm

1 stop16h 40m

$352

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Sat 9/6

7:10 am-7:14 pm

2 stops12h 04m

Monterey Regional

Mon 9/8

7:56 pm-10:44 am

1 stop14h 48m

$371

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 9/26

1:10 pm-12:16 pm

1 stop23h 06m

Monterey Regional

Tue 9/30

6:09 am-11:56 am

1 stop29h 47m

$401

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Fri 8/29

12:22 pm-9:14 am

1 stop20h 52m

Monterey Regional

Mon 9/1

7:05 pm-11:32 am

1 stop16h 27m

$421

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 $283. If you’re not able to fly to Monterey in July, then October is your next best option. Flight prices from Ontario to Monterey during October average around $317.

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 $283. 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 $338.

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

Best Price Found

$187

Fastest flight time

2h 58m

Direct flights

None

Airports in Monterey

1 airport
The best one-way flight to Monterey from Ontario in the past 72 hours is $187. The best round-trip flight deal from Ontario to Monterey found on momondo in the last 72 hours is $279.
The fastest flight from Ontario to Monterey takes 2h 58m
There are no direct flights from Ontario to Monterey. Popular non-direct route for this connection is Ontario Airport - Monterey Regional Airport.
There is 1 airport near Monterey: Monterey Regional (MRY)
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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 2h 58m, 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
8,900 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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