$33 Find Deals on Flights from Ontario

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 4/19. 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.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for cheap international flights from Ontario

Travelers love KAYAK
41 299 237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Free to useThere are no hidden charges or fees.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
Flight Deals

Find Cheap Flights from Ontario

Where can I fly from Ontario?Prices from ONT, departing Sun 4/26 and returning Sun 5/3

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

Thu, May 7 - Mon, May 11
Frontier Logo
8:06 pm - 2:29 pm
ONT
-
CUN
16h 23m
1 stop
Frontier Logo
3:39 pm - 10:05 am
CUN
-
ONT
20h 26m
1 stop
$261Frontier
Fri, May 15 - Tue, May 19
Frontier Logo
8:06 pm - 2:29 pm
ONT
-
CUN
16h 23m
1 stop
Frontier Logo
3:39 pm - 10:05 am
CUN
-
ONT
20h 26m
1 stop
$262Frontier
Thu, May 7 - Mon, May 11
Frontier Logo
8:06 pm - 2:29 pm
ONT
-
CUN
16h 23m
1 stop
Frontier Logo
11:05 am - 7:11 pm
CUN
-
ONT
10h 06m
1 stop
$264Frontier
Tue, Apr 14 - Tue, May 12
TAP AIR PORTUGAL Logo
4:45 pm - 9:50 pm
LAX
-
BCN
20h 05m
1 stop
TAP AIR PORTUGAL Logo
6:00 am - 1:45 pm
BCN
-
LAX
16h 45m
1 stop
$497TAP AIR PORTUGAL
Tue, Apr 14 - Tue, Apr 21
TAP AIR PORTUGAL Logo
4:45 pm - 4:55 pm
LAX
-
BCN
15h 10m
1 stop
TAP AIR PORTUGAL Logo
6:00 am - 1:45 pm
BCN
-
LAX
16h 45m
1 stop
$509TAP AIR PORTUGAL
Tue, Apr 14 - Mon, Apr 20
TAP AIR PORTUGAL Logo
4:45 pm - 10:35 am
LAX
-
BCN
32h 50m
1 stop
TAP AIR PORTUGAL Logo
8:20 pm - 1:45 pm
BCN
-
LAX
26h 25m
1 stop
$513TAP AIR PORTUGAL
Fri, Apr 10 - Tue, Apr 14
LEVEL Logo
7:55 pm - 10:35 pm
LAX
-
MAD
17h 40m
1 stop
LEVEL Logo
6:00 pm - 6:10 pm
MAD
-
LAX
33h 10m
1 stop
$530LEVEL
Fri, Apr 10 - Thu, Apr 23
LEVEL Logo
7:55 pm - 10:35 pm
LAX
-
MAD
17h 40m
1 stop
LEVEL Logo
8:00 pm - 6:10 pm
MAD
-
LAX
31h 10m
1 stop
$559LEVEL
Wed, May 6 - Mon, May 18
Scandinavian Airlines Logo
7:10 pm - 12:00 pm
LAX
-
MAD
31h 50m
1 stop
Scandinavian Airlines Logo
6:30 pm - 4:50 pm
MAD
-
LAX
31h 20m
1 stop
$563Scandinavian Airlines
Mon, Aug 10 - Tue, Aug 18
Singapore Airlines Logo
12:05 am - 7:00 pm
LAX
-
BKK
28h 55m
1 stop
Singapore Airlines Logo
9:15 pm - 7:55 pm
BKK
-
LAX
36h 40m
1 stop
$571Singapore Airlines

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

Tue, Apr 21 - Thu, Apr 30
Frontier Logo
11:44 am - 12:59 pm
ONT
-
LAS
1h 15mnonstop
Frontier Logo
7:20 pm - 8:25 pm
LAS
-
ONT
1h 05mnonstop
$67Frontier
Mon, Apr 20 - Tue, Apr 21
Frontier Logo
8:59 pm - 10:08 pm
ONT
-
LAS
1h 09mnonstop
Frontier Logo
5:41 pm - 6:49 pm
LAS
-
ONT
1h 08mnonstop
$68Frontier
Wed, Apr 15 - Wed, Apr 15
Frontier Logo
11:44 am - 12:59 pm
ONT
-
LAS
1h 15mnonstop
Frontier Logo
5:41 pm - 6:49 pm
LAS
-
ONT
1h 08mnonstop
$69Frontier
Tue, Apr 14 - Sat, Apr 25
Southwest Logo
12:55 pm - 5:55 pm
ONT
-
HOU
3h 00mnonstop
Southwest Logo
8:10 am - 9:35 am
HOU
-
ONT
3h 25mnonstop
$215Southwest
Tue, Apr 21 - Tue, Apr 28
Southwest Logo
12:55 pm - 5:55 pm
ONT
-
HOU
3h 00mnonstop
Southwest Logo
9:00 pm - 10:25 pm
HOU
-
ONT
3h 25mnonstop
$217Southwest
Wed, Apr 22 - Sat, Apr 25
Delta Logo
12:49 pm - 12:48 am
ONT
-
JFK
8h 59m
1 stop
Delta Logo
2:55 pm - 9:00 pm
JFK
-
ONT
9h 05m
1 stop
$281Delta
Tue, Apr 14 - Fri, Apr 17
American Airlines Logo
11:59 pm - 1:28 pm
ONT
-
JFK
10h 29m
2 stops
American Airlines Logo
5:20 pm - 10:36 pm
JFK
-
ONT
8h 16m
1 stop
$283American Airlines
Wed, Apr 22 - Sat, Apr 25
American Airlines Logo
11:59 pm - 11:34 am
ONT
-
JFK
8h 35m
1 stop
American Airlines Logo
11:00 am - 7:34 pm
JFK
-
ONT
11h 34m
2 stops
$286American Airlines
Tue, May 5 - Thu, May 7
Alaska Airlines Logo
8:30 am - 11:35 am
ONT
-
HNL
6h 05mnonstop
Alaska Airlines Logo
12:35 pm - 9:10 pm
HNL
-
ONT
5h 35mnonstop
$357Alaska Airlines
Tue, Sep 8 - Thu, Sep 24
Alaska Airlines Logo
8:00 am - 10:57 am
ONT
-
HNL
5h 57mnonstop
Alaska Airlines Logo
12:55 pm - 9:28 pm
HNL
-
ONT
5h 33mnonstop
$364Alaska 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 (12% of total searches). The next most popular destinations are San Francisco (10%) and Seattle/Tacoma Intl (9%).

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 Taipei City, Bangkok and Manila.

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 (59% of total searches). The next most popular destinations are Mexico (36%) and El Salvador (5%).

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 Phoenix, Honolulu, Salt Lake City, Denver and San Jose. On average, the cheapest of these destinations on KAYAK over the last 2 weeks for a return flight was San Jose at $149, while the most expensive was Honolulu, at $265.

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, San José del Cabo, Morelia, León and San Salvador. On average, the cheapest of these destinations on KAYAK over the last 2 weeks for a return flight was San José del Cabo at $142, while the most expensive was Taipei City, at $767.

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 14h 40m. The next longest is Honolulu at 6h 03m, followed by a flight to New York at 5h 20m.

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 Morelia and cost $39. The next cheapest destinations were San José del Cabo at $40 and San Jose at $48.

Good to know

Low seasonJanuary
Cheapest flight$33
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly with an average 13% increase in price.
Flight from Ontario to Las Vegas

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.
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 $167 one-way - $255 round-trip; Dallas $172 one-way - $292 round-trip; Taipei City $428 one-way - $746 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 817 reviews
8.0Comfort
8.0Entertainment
8.5Crew
8.3Boarding
7.8Food
Airline reviews

Everything was fine except the seats were quite compressed and hard for the 12 hour flight

6.0 GoodJeff, Mar 2026
YVR - TPE
Read more China Airlines reviews

Everything was fine except the seats were quite compressed and hard for the 12 hour flight

The crew are amazing. Very professional, polite, kind, and accommodating.

Flight attendants. Food, entertainment and most of all, be on time.

We are glad to have used China Airlines for our trip. Continue the good service! Thank you!

The flight was uneventful and the crew was kind and professional. Really appreciate the option to order a vegan meal for the flight!

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

I absolutely loved my flight from Taipei to LAX. I was originally assigned to a different seat, however one of the stewardess noticed I was uncomfortable in my seat. She offered to move me to a more comfortable setting. Although she didn’t have to do what she did, I am more than grateful and thankful for her doing so. My longer flight felt much more comfortable, just by her taking notice. I really appreciate her.

Overall was a lovely experience. The crew were kind and courteous throughout the entire flight.

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

They need to improve on how the plane lands cause it was not smooth at all.

Southwest was greaat! The most expensive but the least upsetting for those we were flying to see.

Boarding was easy. The seats are small and fairly uncomfortable

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

Flight boarded late after announcing on time boarding. Flight arrived only a little late despite late departure. Had trouble connecting to WiFi

The Southwest experience has definitely taken a dive from its early days. You can no longer deferentiate from other airlines. Air travel is too expensive. Southwest is no longer budget friendly. They have lost me as a loyal customer.

The charges were ridiculous for an hour flight and the turbulence was very scary.

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

The wifi on the plane is great. The only issue that I have is that I prefer an aisle seat and on my trips this week, I was either in the middle or window. If we can work to secure aisle seating, I will be thrilled. Nice trip.

Great flight but super high price. Glad it was a business trip and not personal

They delayed the flight from 9:00 to 11:55 At 11:45 they canceled the flight. I paid a premium price for the tickets with poor service

My flight was canceled a few hours before boarding. I was rebooked on Copa airlines and missed an important meeting .

Business class seats felt very cramped compared to other airlines.

OK, we were delayed and had to de plane and reboard.

The 777’s economy seat’s legroom was more tolerable than expected. I appreciate the reclining mechanism which slides the seat forward to minimize cannibalizing the space behind. The food was terrible: very salty.

Seats are uncomfortable. This has been a trend in the industry for decades. Trying to fit more seats on each plane to increase profits at the expense of the passenger.

Staff were good. My seat was in need of repair, but for a short flight was not problematic. Usual basic snack and drink setup that you'll find on any US carrier. Over, a decent, basic flight.

Complimentary light meal would be appreciated. But great flight crew service on all legs

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

We had turbulence ever 1/2 hr or so and the captains announcements were SOOOO LOUD

I was in last row so that is never great bc the person in front of me leaned his seat all the way back into me.

The experience at checkin for my American Airlines flight from Sacramento to LAX was very good including the assistance I received in getting my bags checked in and boarding passes printed. Was pleasantly surprised the my bags were checked through all the way to my destination at Clark International Airport in Angeles, Philippines.

Terrible planning. And even worse gate agents. Absolutely rude behavior.

Flight was scheduled at 11:26am but they keep Delaying until midnight. They waited at airport restless.

Rough flight No beverage service due to turbulence Bottom Seat cushion was non existent

Not good. One of my luggage is missing. And until now they can’t find it

My 9:50AM flight was delayed to 3:40PM "due to incoming aircraft delay". No aircraft is "delayed" that long. Found out once we did board (after several changes in times) that the aircraft had a maintenance issue and we had to wait for another aircraft. Just tell us that. The aircraft we did get was old and the seats need to be updated. I have been traveling for several weeks with AA and you should refresh your entertainment content as frequent flyers have gone through most of your new content. I have Celiac and a shellfish allergy and continue to have struggles with meals on business and first class flights. Please keep this in mind. Sorry - was a long travel day yesterday and a bit cranky this morning with my experience comments. Still an AA fan.

Delay after delay with little communication then AA lost my luggage and at airport would not assist just said scan this QR code to track your luggage and submit a claim. However QR code provided did not work so have to go back to airport

Dloght delayed by 2.5 hrs . Common theme in my last four american floghts

They are rarely on time! Very hard to plan your travels when flights or connections keep getting delayed.

The crew acted like they had never done this and kept barking passive aggressive orders at people. + the security line + the delay + sitting on the tarmac for 2 hours + none of the apps or signage updating with correct times

More inflight connection. And leg space is horrible. And the paying for baggage I'd ridiculous!!!

My flight was originally from SAT to MCO connecting from MCO to ORD. We got diverted to ATL and than Frontier staff there was sooo un helpful first they said they couldn’t give us any accommodation since our flight first got delayed that cancelled and now it’s 221am and I am still in ATL since they said they need to create a new flight my final destination is ORD and I have been delayed twice and cancelled. With no real help the frontier app didn’t work no email updates over all such a horrible experience

There's no seats that lean back with little leg space i wad uncomfortable the entire flight. Your charges for extra baggage is despicable and costly!!

Remind customers of the need to have passport or new ID for boarding.

Flight was canceled. Most upsetting was message from Kayak, stating that the flight was canceled and click with Kayak for details regarding rebook, refund details. THERE'S NO INFORMATION PROVIDED BY KAYAK EXCEPT THAT FLIGHT IS CANCELED. AND NOW THIS SURVEY TO FIND OUT HOW WAS THE FLIGHT !!!!!!!

The flight never took off and we spent 7 hours at the airport

It was ok. It was expensive to check 2 bags ($75.00 per bag), and then it took a long time to wait for shuttle to take us from one terminal to the terminal where the plane was taking off at LAX. And all of this for a flight where we had to pay for any food or drink that was not water.

When I wanted to check in 3 hours prior to boarding time, the employees mentioned “a little over an hour delay” so I waited for an hour then I went to go look for food in the terminal and most people from that flight were in the same area looking for food. Finally I decided after food to check to see if it’s anytime closer and now it’s 2 mins until boarding closes?! What are you kidding me? I didn’t receive anything via sms about boarding now nor via email or on the intercom. I luckily made it through, barely, and then there’s no room for my carry on mind you I’m in the very first row so I had to place my purse in one further row back and my carry on sections down. Not sure who pays for better seats to get your stuff placed all over the plane but that was the worst experience I’ve ever had flying with anyone.

This airline sucks. They offer low rates then charge you for everything, the app does not work well, the seats are the most uncomfortable. Maintenance issues on the flight, and you still have to sit through their credit card commercials. People are nice enough but does not make up for overall poor experience.

Everything you need to know for your flight from Ontario

Information on your arrival and departure airports