$134 Find Deals on Flights from Ontario - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Worldwide departing on 10/1. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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Find Cheap Flights from Ontario

Where can I fly from Ontario?Prices from ONT, departing Sat 8/22 and returning Sat 8/29

Book Cheap International Flights from Ontario

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip international flight deals from Ontario to anywhere

Tue, Aug 11 - Tue, Aug 25
Multiple Airlines Logo
12:15 am - 2:05 am
LAX
-
CUN
23h 50m
1 stop
Multiple Airlines Logo
12:49 pm - 6:12 pm
CUN
-
LAX
7h 23m
1 stop
$316Multiple Airlines
Sat, Sep 5 - Sat, Sep 12
Viva Logo
3:10 pm - 6:45 pm
LAX
-
CUN
25h 35m
1 stop
Viva Logo
7:00 am - 1:40 pm
CUN
-
LAX
8h 40m
1 stop
$322Viva
Sat, Aug 29 - Sat, Sep 5
Viva Logo
3:05 pm - 5:00 pm
LAX
-
CUN
23h 55m
1 stop
Viva Logo
7:00 am - 1:40 pm
CUN
-
LAX
8h 40m
1 stop
$324Viva
Tue, Aug 18 - Thu, Aug 27
TAP AIR PORTUGAL Logo
4:45 pm - 12:20 am
LAX
-
MAD
22h 35m
1 stop
TAP AIR PORTUGAL Logo
10:25 pm - 2:35 pm
MAD
-
LAX
25h 10m
1 stop
$638TAP AIR PORTUGAL
Tue, Sep 8 - Fri, Sep 18
TAP AIR PORTUGAL Logo
4:45 pm - 12:20 am
LAX
-
MAD
22h 35m
1 stop
TAP AIR PORTUGAL Logo
8:10 pm - 2:40 pm
MAD
-
LAX
27h 30m
1 stop
$639TAP AIR PORTUGAL
Tue, Sep 8 - Thu, Sep 24
TAP AIR PORTUGAL Logo
4:45 pm - 12:20 am
LAX
-
MAD
22h 35m
1 stop
TAP AIR PORTUGAL Logo
10:25 pm - 2:35 pm
MAD
-
LAX
25h 10m
1 stop
$640TAP AIR PORTUGAL
Wed, Sep 2 - Mon, Sep 21
China Southern Logo
11:50 pm - 2:20 pm
LAX
-
HND
22h 30m
1 stop
China Southern Logo
3:40 pm - 8:00 pm
HND
-
LAX
20h 20m
1 stop
$729China Southern
Mon, Oct 5 - Sat, Dec 5
Singapore Airlines Logo
11:30 pm - 5:15 pm
LAX
-
BKK
27h 45m
1 stop
Singapore Airlines Logo
9:10 pm - 6:10 pm
BKK
-
LAX
36h 00m
1 stop
$740Singapore Airlines
Tue, Aug 4 - Wed, Sep 2
Cathay Pacific Logo
1:20 pm - 11:05 am
LAX
-
BKK
31h 45m
1 stop
Cathay Pacific Logo
7:35 am - 11:15 am
BKK
-
LAX
17h 40m
1 stop
$741Cathay Pacific
Tue, Aug 18 - Tue, Aug 25
China Eastern Logo
12:30 pm - 3:50 pm
LAX
-
BKK
37h 20m
1 stop
China Eastern Logo
5:05 am - 10:05 am
BKK
-
LAX
19h 00m
1 stop
$742China Eastern

Book Cheap Domestic Flights from Ontario

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip domestic flight deals from Ontario

Thu, Sep 3 - Fri, Sep 11
Frontier Logo
8:48 am - 10:15 am
ONT
-
SFO
1h 27mnonstop
Frontier Logo
12:31 pm - 2:00 pm
SFO
-
ONT
1h 29mnonstop
$79Frontier
Thu, Sep 3 - Mon, Sep 7
Frontier Logo
8:48 am - 10:15 am
ONT
-
SFO
1h 27mnonstop
Frontier Logo
9:33 am - 11:02 am
SFO
-
ONT
1h 29mnonstop
$84Frontier
Wed, Oct 21 - Tue, Oct 27
American Airlines Logo
7:34 pm - 9:29 am
ONT
-
JFK
10h 55m
2 stops
American Airlines Logo
7:58 am - 3:16 pm
JFK
-
ONT
10h 18m
2 stops
$298American Airlines
Mon, Aug 31 - Fri, Sep 4
United Airlines Logo
7:13 pm - 9:13 am
ONT
-
LGA
11h 00m
2 stops
United Airlines Logo
5:25 pm - 10:35 pm
LGA
-
ONT
8h 10m
1 stop
$304United Airlines
Mon, Aug 10 - Mon, Aug 24
United Airlines Logo
5:45 am - 4:44 pm
ONT
-
LGA
7h 59m
1 stop
United Airlines Logo
3:29 pm - 10:35 pm
LGA
-
ONT
10h 06m
1 stop
$306United Airlines
Tue, Sep 29 - Thu, Oct 1
Delta Logo
5:15 pm - 6:26 am
ONT
-
JFK
10h 11m
1 stop
Delta Logo
6:00 am - 12:14 pm
JFK
-
ONT
9h 14m
1 stop
$312Delta
Mon, Aug 24 - Tue, Aug 25
American Airlines Logo
12:59 pm - 11:58 pm
ONT
-
JFK
7h 59m
1 stop
American Airlines Logo
6:56 am - 1:31 pm
JFK
-
ONT
9h 35m
1 stop
$316American Airlines
Mon, Sep 28 - Mon, Oct 5
Multiple Airlines Logo
7:59 pm - 10:47 am
ONT
-
HNL
17h 48m
1 stop
Multiple Airlines Logo
12:58 pm - 9:29 pm
HNL
-
ONT
5h 31mnonstop
$377Multiple Airlines
Sun, Sep 27 - Tue, Oct 27
Delta Logo
6:00 am - 7:28 pm
ONT
-
HNL
16h 28m
2 stops
Delta Logo
7:00 am - 11:46 pm
HNL
-
ONT
13h 46m
2 stops
$378Delta
Mon, Aug 17 - Wed, Aug 26
Multiple Airlines Logo
5:26 pm - 12:12 am
ONT
-
HNL
9h 46m
1 stop
Multiple Airlines Logo
1:33 pm - 10:10 pm
HNL
-
ONT
5h 37mnonstop
$379Multiple Airlines
Booking Insights

KAYAK's insights & trends for flights from Ontario

Get data-powered insights and trends into flights from Ontario to help you find the cheapest flights, the best time to fly and much more.

Which are the most popular places to fly to from Ontario?

The domestic destinations KAYAK users have most searched for when searching for flights from Ontario.

Based on KAYAK flight searches, the most popular place to fly from Ontario is Honolulu (20% of total searches). The next most popular destinations are New York (15%) and Seattle/Tacoma Intl (13%).

What are the most popular international flights out of Ontario?

The international destinations KAYAK users have most searched for when searching for flights from Ontario.

There are many international destinations you can fly to from Ontario. The most popular international destinations among KAYAK users are Tokyo, Mexico City and Cancún.

What are the most popular countries to fly to from Ontario?

The most popular countries KAYAK users have searched for from Ontario along with the average round-trip price for the route clicked by KAYAK users in the last 2 weeks.

Based on KAYAK flight searches, the most popular country to fly to from Ontario is Taiwan (53% of total searches). The next most popular destinations are Mexico (39%) and El Salvador (8%).

Which cities can I fly to direct from Ontario?

There are loads of places you can fly direct to from Ontario. The most popular destinations for direct flights among KAYAK users are Chicago, Chicago, Phoenix, Portland and Honolulu. On average, the cheapest of these destinations on KAYAK over the last 2 weeks for a return flight was Chicago at $119, while the most expensive was Portland, at $318.

Which international cities can I fly to direct from Ontario?

There are many international destinations you can fly to non-stop from Ontario. The most popular international destinations from KAYAK users are Taipei City, Guadalajara, Morelia, León and San Salvador. On average, the cheapest of these destinations on KAYAK over the last 2 weeks for a return flight was Morelia at $250, while the most expensive was Taipei City, at $890.

What is the longest direct flight from Ontario?

The longest direct flight you can take from Ontario is to Taipei City Taiwan Taoyuan Intl Airport, with a duration of 13h 20m. The next longest is Honolulu at 5h 58m, followed by a flight to New York at 5h 22m.

What are the cheapest places to fly to from Ontario?

The cheapest destination for a flight from Ontario found on KAYAK in the last two weeks was San Francisco and cost $28. The next cheapest destinations were San Jose at $54 and Las Vegas at $64.

Good to know

Low season

January

Cheapest flight

$28
Best time to beat the crowds with an average 16% drop in price.
Most popular time to fly and prices are also 2% lower on average.
Flight from Ontario to San Francisco

Flights from Ontario: the best tips from KAYAK users' own experiences

Insights shared by verified travelers who flew from Ontario to anywhere 
Verified travelerFlew with Alaska Airlines
ONT
-
PDX
Mar 2026
TSA security isn’t bad, sometimes gets crowded right before another flight goes out. Smaller airport but has many flight options.
AdrianaFlew with American Airlines
ONT
-
PHX
Apr 2026
Check on your flight status often, as things can change and you may not be notified promptly
FraxysFlew with American Airlines
ONT
-
DFW
Jun 2025
Bring an empty refillable water bottle/container through TSA and fill it up as soon as you pass the security check. The water station is available to the left and to the right of it.
Verified travelerFlew with Frontier
ONT
-
LAS
Dec 2024
Pack light and arrive earlier.. Also download the App and check your flight and check in..
LeoFlew with American Airlines
ONT
-
CLT
Sep 2024
Have plenty of patience for the casual travelers! They are oblivious of rules and etiquettes that slows down the process for everyone. Case in point, a guy held up the line trying to place both his personal item (should be UNDER the seat in front of you) and his carry on case horizontally. Obviously not aware of the big poster right in front of his displaying the proper way of placing his case on it's side. Slowed the whole line of people behind him. Also be mindful the agents in Ontario airport (or any smaller airports) might not be the most knowledgeable on the rules and regulations of air travel, luggage specification allowances etc. Stay patient!! Also the seats do not recline that well anymore on AA flights. So if you have back problems, be sure to bring some back supports.
MariFlew with American Airlines
ONT
-
CLT
Jan 2024
Bring a blanket it's very cold on plane

FAQs for booking flights out of Ontario

  • Do flights from Ontario via Ontario International Airport (ONT) consider persons with reduced mobility?

    Special needs passengers, such as those with restricted mobility or impaired vision, will find it easier to fly from Ontario via ONT. To assist these passengers, all airlines have workers stationed throughout the airport. Anyone who requires special airport services should make their request while making their travel arrangements.

  • Can I park my car at Ontario International Airport?

    Different types of parking indicate the probability of parking your car at the airport. If you've arrived at the airport and have a to-and-fro flight from Ontario, consider parking your car at private, public, or valet parking lots with a surcharge both for short and long parking.

  • Are there nursing rooms at Ontario International Airport?

    Lactating mothers are much considered on flights from Ontario via ONT, for it features two nursing rooms for them. One of these nursing rooms is situated in Terminal 2 on the second floor past the TSA screening across from gate 204, next to the women's restroom. The other one is at Terminal 4 on the second floor across from gate 407, next to the family restroom.

  • Which airlines have lounges at Ontario International Airport in Ontario?

    Consider using the Aspire Lounge in Terminal 2, open to guests traveling with United, Alaska, Frontier, and Delta airlines. The lounge provides unparalleled airfield views, excellent food, and comfortable seating to work or relax.

  • What is Ontario also known as?

    Ontario Airport’s airport code is ONT. It can also be referred to as Ontario, Ontario Intl.

  • How does KAYAK find such low prices on flights from Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to your destination with an airline and back to Ontario with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding a cheap flight out of Ontario

  • Looking for a cheap flight? 25% of our users found tickets from Ontario to the following destinations at these prices or less: Denver $190 one-way - $296 round-trip; Dallas $188 one-way - $351 round-trip; Taipei City $505 one-way - $919 round-trip
  • Flights from Ontario depart from Ontario International Airport (ONT). Most passengers use Ontario International Airport from Ontario to Mexico and Las Vegas.
  • It would take you approximately 5 minutes to cover the 3 miles connecting the Ontario city center to Ontario International Airport. If you are in a hurry, consider using a private means of transport such as a taxi, Uber, or car rental. A bus or a train is an alternative means of transport if you are not in a hurry to catch your flight.
  • Travelers with the earliest flight from the airport should consider staying in one of the hotels close to it. For instance, you can book a room at Holiday Inn Ontario Airport. This hotel is a 3-minute walk to ONT and provides a complimentary airport shuttle to its guests who are connecting to the airport for a flight and have pieces of luggage.
  • Never leave your pet behind if you have a flight from Ontario through Ontario International Airport. The airport considers animals by building several pet relief areas inside and outside. These areas are close to gates 210 in Terminal 2 and 410 in Terminal 4. The outside pet relief area is located at the end of the terminal building.
  • Everyone understands how stressful it is to travel with children on long vacations. JetBlue Airlines is a good option if you are flying with children from Ontario. This airline provides kid-friendly amenities such as video games, subscribed cartoon channels, plane toys, and free refreshments to keep kids entertained during the flight. This airline's planes boast big, pleasant seats with ample legroom, making it ideal for parents with children on their laps.

Reviews of the top 5 airlines serving from Ontario to Worldwide

 
Need help choosing which airline to fly with from Ontario to Worldwide? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.3
China AirlinesOverall score based on 838 reviews
8.0Entertainment
8.3Boarding
8.0Comfort
7.8Food
8.5Crew
Airline reviews

We were not sat together for the longeset duration of our travel very uncomfortable didnt enjoy that they fed us at 2 am

2.0 MediocreAnonymous, Jul 2026
SFO - TPE
Read more China Airlines reviews

We were not sat together for the longeset duration of our travel very uncomfortable didnt enjoy that they fed us at 2 am

I love my Delta crew, they were so welcoming and helpful.

Better organization of boarding procedures. Terrible leadership guiding people to gates.

I did not take the flight, tried to cancel it right after I booked it, but was unable to reach anyone. I blame Kayak for this situation because they sent the booking through another company and I was unable to get anyone to talk to me about the situation. I had to just take the hit and pay for another flight through Cathay Pacific, which was wonderful. I will never use Kayak again. (I bet they don’t post this review!) I’ll just post about them on social media sites. I don’t want anyone to have to go through the hassle and expense I dealt with.

Unable to set seat assignment. Got a call from presumably “China airlines representative” but was asking for an exorbitant amount for the seat assignment. Was traveling as a family end up being assigned to different seats as a result. Will never use underpricer again.

Not many selections for entertainment. Bulk head seats are no longer available with out fee at the counter. That’s pretty lame.

I would have liked to know how to order a special meal (for medical purposes) before the flight.

Ask flight attendant for water during flight and she was a little rude get the water.

For a long-haul flight, the crew did a very good job of keeping the lavatories clean and the aisles clear.

The check-in crew at SF did not put on breakable glass stickers on check-in baggages which caused my antique whisky bottle to break during transportation.

Red eye from San Diego. Temperature of the cabin was way too warm and the air duct flowed very little air.

I think Southwest is the number one airline that anyone can fly I have flown for the first time Frontier and what a joke and their customer service United was a very strange experience I'm only sticking to Southwest from here on out for sure

Great job Southwest! My family doesn't fly often but we felt safe the whole time.

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

Was fine, delayed and feels like southwest is always late

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

Delayed flight, lack of information, boarding process is a mess as is the carryon luggage causing issues when leaving the plane….just a poor experience.

Comfortable. Easy. No problems. Just wish they had gf options for snacks.

The crew was very kind and made going to Hawaii relaxing and fun to look forward to! Thank you Southwest for a pleasant flight!

I liked receiving attention from aged and well experienced flight attendants. I disliked the non-gluten-free snack but I brought my own so I was OK.

Baggage claim signs were not updated with my flight information, so I had to guess. The app wasn't updated either.

It was a short, comfortable flight. It did leave an hour late due to the pilot having to be replaced (family emergency) but that didn’t inconvenience myself & my friend. The situation was explained, eventually.

The seats were very uncomfortable. I paid for the front economy. i swear they added a row of seats in there. It was so tight, that I could measure the distance between my seat and the one in front from my elbow to the tips of my fingers plus six inches. The seat cushion was completely worn out. The dinner was very good. Thank you for having a vegetarian option as a standard. But breakfast was nothing but sugar. that's not food. The crew was crabby and rude, especially in regards to coming to the back gallery. And the entertainment choice: why would you put violent movies on the choice? the Godfather? Some movies with black women being beaten over the head with clubs? What the heck? You know that when there is a movie on a plane, everyone gets to watch it. Why choose the most violent titles possible? The total number of movies were very limited, and the television, even more so. No games were available on the set. The wellness section was nice, thank you. I appreciated a galley in the middle where I could stand. The seats were unbearable.

UA594 was delayed multiple times. I ended up getting picked up so I can make it in time for work 6AM on Monday, 7/6/2026

Boarded from a very small gate at LAX. Staff at gate had us line up, then waited 25 minutes to board without a word of explanation. Plane arrived on time then waited 20 minutes for a plane to vacate our gate. Majority of bags arrived after 15 minutes but it took an hour for a small number of remaining bags to be off-loaded despite my “priority” bag tag.

Excellent communication from the staff. We actually arrived early. Very friendly and professional staff.

Great staff. Clean plane, but we were delayed for more than an hour due to maintenance issues and had to board another plane.

I was very disappointed with my experience at the United Airlines baggage check. The representative was rude and unhelpful. I was required to remove approximately 1.5 pounds from my two checked bags, even though it was a very small amount over the limit. The interaction was unnecessarily unpleasant, and I expected much better customer service. I hope United will review this incident and provide additional customer service training to its staff.

No extra snacks were available. Meals quality is terrible. Crew was not friendly.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

Not good. Flight crew, was not friendly and just shoved stuff at us. Not the way I like to travel.

The WiFi didn’t work entire flight, couldn’t watch a movie. The recline button didn’t work

Well, true to American Airlines, both of my flights were delayed. But it’s a good thing that American is so consistently incompetent because if the first flight was delayed in the second flight was on time then I might’ve had a problem..

Aside from the little delay, overall was flight good. Made it safely. Thanks!

Ontario airport boarding was very easy to park and access, is clean and TSA took 10 minutes total. Check-in was a breeze and cruise was very nice.

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

The flight was on time and arrived early. The crew were friendly and helpful.

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

VERY disappointed at the agent checking in my luggage. I know that the weight limit is 23 kg, a little over 50 pounds (50.71 pounds). Yet the agent kept repeating "50 pounds". So I said, the limit is 23 kg, and she had the audacity to say 'no, it is 22 kg!" Imagine my surprise. Was she ignorant or was she poorly trained? Not sure. The boarding process was pretty good. The speakers were loud enough so I still could hear them despite inconsiderate passengers continuing to speak while the announcements were going on. During the flight, the teenage girl sitting behind me kept pressing her feet to the back of my chair. I turned around several times, yet she did not get the hint. I did not make a fuss since I sense I had a bad streak that night with AA, so I just did the best I can to lean forward and not let that bother me.

It was wonderful upgrading to first. Plane was so cold thou. Crew was great. Wish there was a food option in first for such a long flight. Doesnt matter the time of day. Chintzy.

The seats are tiny and they don’t recline. The planes are dirty and very small. You have to pay for carry on and even the personal item that you’re allowed is smaller than with other airlines. Flights are usually delayed and there’s no screens or any amenities or entertainment.

The takeoff was the smoothest I've ever experienced on any airline and this is the first time I've flown on frontier so this was an extremely pleasant surprise!

A lady asked to stop the flight after the tunnel pulled away and we began to depart a flight that was already hours late. The attendance respectfully stopped the the plane and had the tunnel return. After the tunnel returned the passenger claimed to have changed her mind . The tunnel was then put in reverse and the passenger remained on the plane .. They should have sent the sick passenger off the plane like initially replaced. They existed a couple off the plane prior to that situation.. So.. all and all.. it was a long and flight.. .

We understand and comply with Frontier’s bag sizes. We’ve had some problems in past while having to await other passengers who do not understand the baggage restrictions or have not prepaid and that is usually our biggest concern (others delaying us) with flying Frontier. Flying OUT of ONT, however, has always been a great experience. I’ve also noted even on delayed Frontier flights very knowledgeable pilots who manage expectations well.

Long lines, rude staff, everything that's offered you have to pay for.

The last time I flew Frontier was in the 1960s when it was a “real” airline. We flew this time because of the price & schedule. As the saying goes, you get what you pay for.

I appreciated the upgrade to free cary-on bag and seat selection at no charge

Flight was delayed on the runway for 40 minutes the crew did not even offer even water to passengers to compensate for the flight delayed. The flight was delayed due to aircraft mechanical issues. Worst customer service ever

This isna terribly run airlines. If you're one minute late, they will deny your ticket. Don't waste your time or money

Flight was delayed for more than 3 hours, crew at ONT airport was rude, and when we got to DFW the airplane had an issue landing, we had to be taxied to the terminal, and the luggage was hold until the next day.

Everything you need to know for your flight from Ontario

Information on your arrival and departure airports