$19 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 8/10. 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

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Find Cheap Flights from Ontario

Where can I fly from Ontario?Prices from ONT, departing Sat 8/2 and returning Sat 8/9

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

Sun, Aug 17 - Thu, Aug 21
Aeromexico Logo
10:15 am - 5:05 pmLAX-CUN
4h 50mnonstop
Aeromexico Logo
6:05 pm - 9:06 pmCUN-LAX
5h 01mnonstop
$235Aeromexico
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Mon, Aug 25 - Wed, Aug 27
American Airlines Logo
12:45 am - 10:55 amLAX-CUN
8h 10m1 stop
American Airlines Logo
11:00 am - 5:06 pmCUN-LAX
8h 06m1 stop
$241American Airlines
Find Deal
Mon, Aug 25 - Wed, Aug 27
American Airlines Logo
12:45 am - 10:55 amLAX-CUN
8h 10m1 stop
American Airlines Logo
12:30 pm - 10:41 pmCUN-LAX
12h 11m1 stop
$242American Airlines
Find Deal
Tue, Jul 15 - Thu, Sep 4
 Logo
6:50 pm - 8:55 pmLAX-BCN
17h 05m1 stop
 Logo
10:00 am - 3:15 pmBCN-LAX
38h 15m1 stop
Fri, Oct 10 - Mon, Oct 20
TAP AIR PORTUGAL Logo
4:40 pm - 1:30 amLAX-BCN
23h 50m1 stop
TAP AIR PORTUGAL Logo
10:40 pm - 2:40 pmBCN-LAX
25h 00m1 stop
$444TAP AIR PORTUGAL
Find Deal
Mon, Nov 10 - Sun, Nov 16
 Logo
2:30 pm - 8:55 pmLAX-BCN
21h 25m1 stop
 Logo
9:40 pm - 12:30 pmBCN-LAX
23h 50m1 stop
Wed, Aug 13 - Wed, Aug 20
 Logo
8:15 pm - 10:10 pmLAX-BVA
16h 55m1 stop
 Logo
10:20 am - 6:25 pmBVA-LAX
17h 05m1 stop
Tue, Oct 7 - Thu, Oct 16
 Logo
10:30 pm - 8:50 amLAX-LCY
26h 20m2 stops
 Logo
7:20 pm - 4:30 pmLCY-LAX
29h 10m1 stop
Sun, Aug 10 - Mon, Aug 25
 Logo
8:15 pm - 11:00 pmLAX-BVA
17h 45m1 stop
 Logo
6:25 am - 6:25 pmBVA-LAX
21h 00m1 stop
Sun, Aug 10 - Mon, Aug 25
 Logo
8:15 pm - 11:00 pmLAX-BVA
17h 45m1 stop
 Logo
6:25 am - 6:25 pmBVA-LAX
21h 00m1 stop

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

Mon, Jul 21 - Mon, Jul 28
Frontier Logo
9:41 pm - 11:14 pmONT-SFO
1h 33mnonstop
Frontier Logo
10:11 pm - 11:40 pmSFO-ONT
1h 29mnonstop
$38Frontier
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Mon, Jul 21 - Mon, Jul 28
Frontier Logo
9:41 pm - 11:14 pmONT-SFO
1h 33mnonstop
Frontier Logo
10:11 pm - 11:40 pmSFO-ONT
1h 29mnonstop
$45Frontier
Find Deal
Mon, Jul 28 - Mon, Aug 4
Frontier Logo
9:41 pm - 11:14 pmONT-SFO
1h 33mnonstop
Frontier Logo
10:11 pm - 11:40 pmSFO-ONT
1h 29mnonstop
$48Frontier
Find Deal
Sat, Aug 9 - Sat, Aug 9
Frontier Logo
5:13 pm - 6:27 pmONT-LAS
1h 14mnonstop
Frontier Logo
8:45 pm - 9:52 pmLAS-ONT
1h 07mnonstop
$53Frontier
Find Deal
Wed, Jul 16 - Wed, Jul 16
Frontier Logo
7:00 am - 8:11 amONT-LAS
1h 11mnonstop
Frontier Logo
8:45 pm - 9:52 pmLAS-ONT
1h 07mnonstop
$58Frontier
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Tue, Jul 15 - Wed, Jul 16
Frontier Logo
5:15 pm - 6:29 pmONT-LAS
1h 14mnonstop
Frontier Logo
8:45 pm - 9:52 pmLAS-ONT
1h 07mnonstop
$59Frontier
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Fri, Jul 18 - Sat, Jul 19
Frontier Logo
12:59 am - 4:19 amONT-DEN
2h 20mnonstop
Frontier Logo
7:49 am - 9:09 amDEN-ONT
2h 20mnonstop
$93Frontier
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Mon, Sep 8 - Mon, Sep 15
Delta Logo
12:00 pm - 7:05 pmONT-HNL
10h 05m1 stop
Delta Logo
10:33 pm - 11:09 amHNL-ONT
9h 36m1 stop
$337Delta
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Wed, Sep 17 - Mon, Sep 22
Delta Logo
6:00 am - 6:57 pmONT-HNL
15h 57m2 stops
Delta Logo
10:33 pm - 11:09 amHNL-ONT
9h 36m1 stop
$342Delta
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Mon, Aug 18 - Wed, Aug 27
American Airlines Logo
6:17 am - 12:22 pmONT-HNL
9h 05m1 stop
American Airlines Logo
11:04 pm - 11:32 amHNL-ONT
9h 28m1 stop
$344American Airlines
Find Deal
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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 Seattle/Tacoma Intl (13% of total searches). The next most popular destinations are New York (11%) and Dallas (7%).

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 London, San José del Cabo and Bangkok.

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 (54% of total searches). The next most popular destinations are Mexico (27%) and El Salvador (19%).

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, Phoenix, Portland, Honolulu and Salt Lake City. On average, the cheapest of these destinations on KAYAK over the last 2 weeks for a return flight was Portland at $113, while the most expensive was Honolulu, at $319.

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, Guadalajara 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 $185, while the most expensive was Taipei City, at $816.

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 05m. The next longest is Honolulu at 5h 55m, followed by a flight to New York at 5h 31m.

Good to know

Low seasonFebruary
High seasonJuly
Cheapest flight$19
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly with an average 2% increase in price.
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 
FraxysFlew with American AirlinesONT-DFWJun 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 FrontierONT-LASDec 2024
Pack light and arrive earlier.. Also download the App and check your flight and check in..
LeoFlew with American AirlinesONT-CLTSep 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 AirlinesONT-CLTJan 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 $124 one-way - $220 round-trip; Dallas $167 one-way - $305 round-trip; Seattle $121 one-way - $197 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 744 reviews
8.0Comfort
7.8Food
8.5Crew
8.0Entertainment
8.3Boarding
Airline reviews

Sat next to a woman who had her period. Blood was on her seat and on the arm rest between us. I ended up having period blood on my jacket and shoes. Very gross!

2.0 Mediocrelinzy, Jun 2025TPE - CGK
Read more China Airlines reviews

Sat next to a woman who had her period. Blood was on her seat and on the arm rest between us. I ended up having period blood on my jacket and shoes. Very gross!

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.

I did not like how the plane landed. It was not smooth.

Been flying with China Airline over years many times. Good experience with them, no issues.

China Airlines crews are very excellent doing their job. Very friendly and hardworking. I will always choose China Airlines over and over. Thank you all for making my flight comfortable. God bless to all the staff. :)

Staff was so nice and very helpful with directions aswell!

Most relaxing long distance flight I have been on. And I have flown on many.

Not great, will likely try to fly another or maybe I should have upgraded my ticket? Needed Air…

I don’t think I’ll be flying them again. Tight seats, no flowing air or air nozzles that you can turn air on you, for those who could have motion sickness this would be your worst nightmare. The pilot was great and experienced (which is what you want when flying 12 hours) overall I’m thankful knowledgeable pilots!

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

No trays in our seats, we sat in first row, purchased a business class fare. Had to hold our drinks and snack in our hands. No plugs for our cell phones. Had to pay for it a drink cocktail each. Seats so uncomfortable.

Flight wasn’t even full, but too many carry-ons caused us to run out of bin space. New bag fee has folks who would usually check their bags carrying on. Watching Southwest morph into Spirit/Frontier is so sad to watch

Southwest is Southwest. No frills. If you're luck enough to get a happy crew (we did), then it makes for a nicer flight.

It was a perfect flight in all aspects! Both legs!

Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.

I liked the crew member who gave flight instructions on "in case of a problem:. The seats are so small that only a young teenager could sit in middle seat.

Great flight staff. Ease of boarding. Overall, very uneventful and easy trip.

Employees were kind and funny, as always! Flight was late but no announcements were made for people with tight connections to help them transition quickly. No service due to turbulence.

I recently flew Southwest from San Jose to Honolulu. I was very impressed with the flight crew, especially the flight attendant in charge of the front of the plane. She came through the aisle at least five times for drinks and water, and two times for snacks. I have not seen such service since I flew first class. Also, for the first time, they gave us the correct baggage claim number, and the luggage came out quickly. I can't wait for Southwest to have assigned seating! I absolutely hate the Cattle Call boarding procedure and the mad dash to get seats and overhead bins. However, the boarding was efficient.

Boarded plane and then delayed 1.5 hours while on the plane

Horrific. They missed my connecting flight to San Diego. I didn’t get there until Monday at 9am when I had a mandatory court settlement conference scheduled at 6am since we had parties on the east coast. This caused many issues. All because United apparently forgot to hold the doors open until my flight landed that only had a 10 minute delay. This was the last flight to Southern California. So I couldn’t even rent a car to finish the trip. United cannot be trusted when traveling on specific days and times since weather didn’t have anything to do with the delays.

Really good 😊 the woman at the gate entrance was a little rude checking in our carry-on but i dont think she worked for the airline, she worked for the airport at sacramento, other than that amazing.

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

Very comfortable (upgraded to business class). The audio on my screen didn’t work, but I managed to play the audio through my phone while watching the screen.

The food was the worst I’ve had on any flight I’ve ever been on.

I was supposed to be on business class at first class from Denver back to Miami due to weather changes. I missed my connection and it’s put on a flight to Fort Lauderdale. Instead of honoring my business class/1st class ticket, they put me in coach, but there were two first class seats open. I think it’s absolutely disgusting that I paid for first class $1300 ticket and they put me in economy and they had to open seats available and I have still not been refunded the difference. I ended up having to eat a snack box instead of the meal I was supposed to get and did not get home till 2 AM so I think that’s a little pathetic that I had to live off crackers for dinner And my poor dog ate some cheese and salami. Oh yes, apparently when they switched me to the new flight they forgot to mention I had a service dog

Flight was late as pilot crew had to land at different airport in their previous flight. Passengers boarded and had to wait for pilots inside plane. Series of incomplete and unnecessary announcements by an annoying voice, rather than complete, informative announcements.

Breakfast was not loaded at SFO due to catering company change. Seems like a major airline at a major hub would have thought of something else or warned passengers to pick up food before boarding a 3 hour flight.

Boarding seemed to be organized bedlam. For what ever reason, preboarding took longer than 20 minutes. Made the plane 20 minutes late taking off. Luckily we arrived on time. Flight crew seemed very friendly. Only slight turbulence.

AA re-routed flight from HNL to LAX due to delay. My group of 3 with reserved seats in row 9 was broken up, with one assigned to a middle seat, another in the last row of the plane. Not happy. No explanation to the delay. No apologies. No compensation. Would have been nice to be offered an Admiral Club admission or a voucher for the extra 3 hours of layover in LAX. Could not hear the boarding gate announcements in LAX. Adjacent gate was boarding at the same time. Loud speakers were competing against each other. Barely made my boarding group.

Almost a 6 hour flight and the only food option is a cheese plate… and chips. Also how is it there are no options for texting on American. I’ll be going back to delta and united.

Bad food, small seats that didn’t recline. I thought I was buying a quantas ticket so I feel like I got scammed

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!

Cramped seats. FAA should make airlines have more legroom, for even short people complain

Flight was full, and would have preferred an aisle seat, but due to getting a late ticket ,the seat I had was adequate. The flight crew were very help full and hard working. Food and drink were excellent for the 11hr flight. Overall I was pleased with flight, and would recommend British Airways again.

Eventless. It was a good flight and good crew. Can’t complaint.

Very helpful ground crew after an earlier flight delay and being rebooked on a different flight.

British Airways staff are very polite and willing to help.

The plane was late and then sat on the runway for almost 45 minutes before taking off.

We’ve all seen the YouTube vids of out of control passengers. But this was an instance of a highly aggressive, bully flight attendant. Yelling in the face of a vet with PTSD who was texting their family. And no , we had not yet been instructed to put our phones in airplane mode. My suggestion is that you should pay whatever difference there is in order to avoid Frontier airlines. Additionally, after 3hrs trying to get customer service frontier offered a $25 voucher. I declined. This experience was so traumatic. To be verbally assaulted and abused by a flight attendant that has the power to say “boo” and I miss my flight ( which was to a family member’s funeral ). Frontier is unsafe and I cannot impress enough how much I discourage anyone ( esp those with any kind of disability like PTSD ) flying on Frontier.

Cancelled flight after I arrived at airport after 75 min drive and parking. Next flight was 4 days in the future. Had to scramble and buy a much more expensive flight on another carrier.

I liked the turn-style feature at gate 209B at LAX. Very efficient process. The gate staff also made several, clearly directed announcements so I felt very informed.

The seats were awful, hard plastic covered in sheet vinyl. The airline tries to scam you into paying extra to get seat together when the flight wasn’t full. They were going to separate a family with young children but my wife who had a row to herself gave up her seat so the young mom could be with her young boys. I’m never giving this airline my money again.

It was a short flight so no food or entertainment….

Frontier had yet another flight cancellation. Have never made a complete round trip with this airline without at least one leg getting cancelled. Miserable flights - dirty, uncomfortable planes that apparently always have issues since I've had multiple delays and cancellations with them.

Flight was delayed 3 times, would have been nice to have received text message instead of email notifications. Frontier app wasn’t even updated accordingly, no gate number disclosed. No agent at front desk of gate to inform of delay. Very confused and left if the dark

They changed the timing , first delayed by 4 hours then went back to 40 mins late, we had to run back to airport to not miss our flight. This is ridiculous

No frills for sure. No gate announcements about flight delay, not even water to drink on the flight.

I loked walking out on the tarmac to board and no first class. I didn't like that they have no snacks or onboard wifi to bide your time.

Everything you need to know for your flight from Ontario

Information on your arrival and departure airports

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