ONT - ATH

$270 Find Cheap Flights from Ontario to Athens

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 Athens departing on 2/2. 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 deals on flights to Athens

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Athens, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Athens, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Ontario to Athens (ONT-ATH)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Athens 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 flight deals from Ontario to Athens

Thu, Nov 27 - Wed, Dec 10
Delta Logo
12:16 pm - 10:35 amONT-ATH
36h 19m2 stops
Delta Logo
12:50 pm - 7:39 pmATH-ONT
40h 49m2 stops
$479Delta
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Thu, Feb 12 - Fri, Feb 27
United Airlines Logo
1:45 pm - 6:05 pmONT-ATH
42h 20m2 stops
United Airlines Logo
6:05 am - 5:41 pmATH-ONT
21h 36m2 stops
$500United Airlines
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Wed, Nov 12 - Wed, Nov 19
Multiple Airlines Logo
5:05 am - 11:35 amONT-ATH
20h 30m2 stops
Multiple Airlines Logo
11:55 am - 12:37 pmATH-ONT
34h 42m2 stops
$503Multiple Airlines
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Wed, Nov 12 - Wed, Nov 19
Multiple Airlines Logo
5:05 am - 1:20 pmONT-ATH
22h 15m3 stops
Multiple Airlines Logo
11:55 am - 12:37 pmATH-ONT
34h 42m2 stops
$523Multiple Airlines
Find Deal
Sat, Mar 21 - Fri, Apr 3
British Airways Logo
5:02 pm - 1:25 amONT-ATH
23h 23m2 stops
British Airways Logo
5:25 am - 10:02 pmATH-ONT
26h 37m2 stops
$652British Airways
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Mon, Apr 20 - Sun, May 3
American Airlines Logo
1:33 pm - 7:10 pmONT-ATH
19h 37m2 stops
American Airlines Logo
6:20 am - 5:46 pmATH-ONT
21h 26m2 stops
$669American Airlines
Find Deal
Fri, Mar 27 - Fri, Apr 3
British Airways Logo
3:09 pm - 9:55 pmONT-ATH
21h 46m2 stops
British Airways Logo
8:05 am - 11:43 pmATH-ONT
25h 38m2 stops
$693British Airways
Find Deal
Sat, Mar 21 - Fri, Apr 3
KLM Logo
1:00 pm - 4:30 pmONT-ATH
18h 30m2 stops
KLM Logo
9:10 am - 9:14 pmATH-ONT
22h 04m1 stop
$713KLM
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Sun, Apr 19 - Wed, Apr 29
KLM Logo
7:00 am - 11:00 amONT-ATH
18h 00m1 stop
KLM Logo
9:10 am - 6:15 pmATH-ONT
19h 05m1 stop
$811KLM
Find Deal
Fri, Mar 27 - Tue, Mar 31
American Airlines Logo
11:12 pm - 11:55 pmONT-ATH
39h 43m2 stops
American Airlines Logo
1:00 pm - 5:49 pmATH-ONT
38h 49m2 stops
$853American Airlines
Find Deal

Everything you should know

Top airlines
Delta
Cheapest • from $479 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
$479
Delta
Thu 11/27Wed 12/10
ONT - ATH • 2 stops
Cheapest one-way
$270
Multiple Airlines
Mon 2/2
ONT - ATH • 2 stops
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Athens!
Booking Insights

KAYAK's insights & trends for Ontario to Athens flights

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

Which airlines provide the cheapest flights from Ontario to Athens?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Ontario to Athens were found on Delta ($479) and United Airlines ($500).

Which airlines fly non-stop between Ontario and Athens?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Ontario to Athens.

There is just one airline that flies from Ontario to Athens direct and that is United Airlines. The best round-trip deal found from United Airlines for the route is $635.

Good to know

Low seasonMarch
Cheapest flight$270
Best time to beat the crowds with an average 33% drop in price.
Most popular time to fly with an average 66% increase in price.
Flight from Ontario to Athens

When to book flights from Ontario to Athens

Are your dates flexible? Find out the best times to travel from Ontario to Athens based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to Athens

  • What is the cheapest flight from Ontario to Athens?

    In the last 3 days, the lowest price for a flight from Ontario to Athens was $270 for a one-way ticket and $479 for a round-trip.

  • Do I need a passport to fly between Ontario and Athens?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Ontario and on arrival in Athens.

  • Which aircraft models fly most regularly from Ontario to Athens?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ontario to Athens?

    Star Alliance is the only airline alliance operating flights between Ontario and Athens.

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

    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 to Athens.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Athens 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 to Athens?

    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 Athens with an airline and back to Ontario with another airline. Booking your flights between Ontario and ATH can sometimes prove cheaper using this method.

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

    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 to Athens from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Ontario to Athens

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Athens. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Athens? 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.
7.4
United AirlinesOverall score based on 8999 reviews
7.7Boarding
7.1Entertainment
6.6Food
7.3Comfort
8.1Crew
Airline reviews

Same as last comment. Food sucks. Quality. Not surprising most people have no clue about nourishment Clearly

4.0 OkayAnonymous, Oct 2025SFO - PTY
Read more United Airlines reviews

Same as last comment. Food sucks. Quality. Not surprising most people have no clue about nourishment Clearly

The flight attendants were great, I joked with one I can’t remember her name, a blond, really sweet. I thought it was run well very professional. This was great i survived Spirit, I know for which I speak.

We were in business class. the angled seats in that class do not have a real window view & the placement of the controls are bad. But we knew that. But the food options were mediocre. The taste was fine, but the size was for a child. It’s just really feels like United is skimping on everything. Even when we were in the Polaris lounge they did not have diet sodas. They said they were out no Coke zero no Diet Coke, etc. I do not think the portion of nuts they serve on the plane could get any smaller. Really a minimal service and offer for what you’re paying for in business.

I was in first class. The outlets at my seat did not work. The plane was shabby and run down. I had prepurchsed a day subscription for internet that was not redeemable. I had to repurchase the internet for my flight and then it didn’t work anyway. Quite disappointed in what was supposed to be the launch of a great vacation.

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

From the first moment you interact with United Airlines, you can expect nothing less but extreme frustration. The baggage handler at the bag drop seems completely unbothered by the presence of customers waiting in line. No help was extended to load the baggage whatsoever. And if any of your bags is overweight by 0.01 pound they will make you re-distribute everything in your suitcase just to play power trip. When it was time to board no help was extended to customers to locate their seats. Moreover. It was a chaotic mess at the gate when it was unclear who should board first and everyone just bunched up, trying to get on the plane. I am sure the crew was doing their best to perform their jobs while being paid their wages however it shouldn’t be that hard to smile once or twice when you’re in the business if serving customers. It is a shame for the United States of America to have a flagship carrier of such low caliber. Our flight was also delayed by about an hour and a half due to further delays prior to our inbound flight. Being someone who has travelled for both business and leisure in Asia, Europe, and South America I have never experienced such poor quality of service.

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

The pilots were late and it made us 1 hour late. The meat was tough and bok choy was also tough.

Stuck on tarmac for two hours plus a 5.5 hour flight. Rude flight attendant. And no meals, not even for purchase!

I learned that seating towards the end of plane that a line forms for the restroom and people use your chair as a hand railing, bumping your seat consistently. I was seated in the aisle. I think that next time if I am towards the back row I would want to sit in the middle or window seat.

Everything you need to know for your flight from Ontario to Athens

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