ONT - ATH

$365 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 8/4. 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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41 299 237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$801
Typical prices: $660-$615
United Airlines
Tue 9/1Wed 9/9
ONT - ATH • 2 stops
Cheapest one-way
$365
British Airways
Tue 8/4
ONT - ATH • 1 stop
Top airlines
United Airlines
Cheapest • from $801 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Ontario and Athens. You'll need at least 2 connections.
Insights
Insights
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Insights
Top layover airports
Dallas (DFW)
Cheapest • Avg $1,288 (round-trip)
Atlanta (ATL)
Shortest trip • 17h 55m (one-way)
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Athens!
Flight Deals
Booking Insights
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

Tue, Sep 1 - Wed, Sep 9
United Airlines Logo
5:00 am - 10:10 am
ONT
-
ATH
19h 10m
2 stops
United Airlines Logo
1:10 pm - 6:11 pm
ATH
-
ONT
39h 01m
2 stops
$801United Airlines
Mon, Sep 28 - Sun, Oct 11
Turkish Airlines Logo
10:56 pm - 8:55 am
ONT
-
ATH
23h 59m
2 stops
Turkish Airlines Logo
3:55 am - 9:29 pm
ATH
-
ONT
27h 34m
2 stops
$803Turkish Airlines
Sun, Aug 16 - Wed, Sep 2
Air Canada Logo
5:00 am - 11:10 am
ONT
-
ATH
20h 10m
2 stops
Air Canada Logo
3:25 pm - 12:38 pm
ATH
-
ONT
31h 13m
2 stops
$808Air Canada
Tue, Sep 15 - Mon, Oct 12
Turkish Airlines Logo
10:56 pm - 8:55 am
ONT
-
ATH
23h 59m
2 stops
Turkish Airlines Logo
10:00 pm - 9:29 pm
ATH
-
ONT
33h 29m
2 stops
$814Turkish Airlines
Tue, Sep 22 - Wed, Sep 30
British Airways Logo
4:59 pm - 2:10 am
ONT
-
ATH
23h 11m
2 stops
British Airways Logo
7:00 pm - 6:57 pm
ATH
-
ONT
33h 57m
2 stops
$817British Airways
Sun, Aug 2 - Tue, Nov 17
United Airlines Logo
6:30 am - 10:35 am
ONT
-
ATH
18h 05m
1 stop
United Airlines Logo
6:25 am - 5:47 pm
ATH
-
ONT
21h 22m
2 stops
$823United Airlines
Sun, Apr 26 - Tue, May 12
KLM Logo
7:05 am - 11:00 am
ONT
-
ATH
17h 55m
1 stop
KLM Logo
12:10 pm - 9:48 pm
ATH
-
ONT
19h 38m
1 stop
$833KLM
Sun, Apr 26 - Tue, May 12
Lufthansa Logo
7:00 am - 10:35 am
ONT
-
ATH
17h 35m
1 stop
Lufthansa Logo
11:45 am - 10:35 pm
ATH
-
ONT
20h 50m
2 stops
$837Lufthansa
Tue, Sep 1 - Wed, Sep 9
Iberia Logo
2:22 pm - 11:45 am
ONT
-
ATH
35h 23m
1 stop
Iberia Logo
6:55 am - 11:06 pm
ATH
-
ONT
26h 11m
2 stops
$842Iberia
Tue, May 5 - Thu, May 14
KLM Logo
10:15 pm - 11:00 am
ONT
-
ATH
26h 45m
1 stop
KLM Logo
9:45 am - 6:36 pm
ATH
-
ONT
18h 51m
1 stop
$843KLM
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.

How much is a round-trip flight from Ontario to Athens?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to Athens departing in September.
Find deals

Good to know

Low seasonFebruary
Cheapest flight$365
Best time to beat the crowds with an average 36% drop in price.
Most popular time to fly with an average 85% 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 $365 for a one-way ticket and $801 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 9538 reviews
7.7Boarding
8.1Crew
7.1Entertainment
7.3Comfort
6.6Food
Airline reviews

It was perfect! I've never flown with United before, but I definitely will in the future

10.0 ExcellentAnonymous, Apr 2026
SFO - LAS
Read more United Airlines reviews

It was perfect! I've never flown with United before, but I definitely will in the future

I had a cancelled flight because of technical issues going to my destination, and a delayed flight coming home. All told it wasn’t a total bust.

The business class seat is exceptional. I wish the food is more palatable.

the entire flight felt off. The crew seemed uninterested and disengaged. The food service was really bad - overcooked, bland, weird food service. They actually woke us up to serve chicken wraps in the middle of the night, after dinner and before breakfast. Made no sense. Ultimately, I was glad they did though, because the breakfast had been held for so long it was inedible. Eggs, potatoes, sausage - all disgusting. We were asked to "honor" the lavatories for premium customers and stay in our own cabin: this was also strange. So people in economy didn't pay enough to use the closest toilet to them??? It's a toilet. All in all, not the experience I have come to expect from United Airlines. The return flight from Paris to SFO was better, btw.

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.

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

Information on your arrival and departure airports

Ontario (ONT)
Athens (ATH)