ONT - ATH

$257 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 3/3. 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
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.

Bundle and saveSave money when you bundle your flight + hotel.

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

Everything you should know

Cheapest round-trip
$634
Delta
Wed 3/18Mon 3/30
ONT - ATH • 2 stops
Cheapest one-way
$433
British Airways
Tue 3/3
ONT - ATH • 2 stops
Top airlines
Delta
Cheapest • from $634 (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
Insights
Insights
Top layover airports
Dallas (DFW)
Cheapest • Avg $1,560 (round-trip)
Atlanta (ATL)
Shortest trip • 17h 53m (one-way)
Insights
Insights
Insights
Insights
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!
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

Wed, Mar 18 - Mon, Mar 30
Delta Logo
1:20 pm - 4:35 pm
ONT
-
ATH
18h 15m
2 stops
Delta Logo
9:45 am - 9:00 pm
ATH
-
ONT
21h 15m
1 stop
$634Delta
Sun, Apr 12 - Wed, May 20
Delta Logo
10:25 pm - 11:00 am
ONT
-
ATH
26h 35m
1 stop
Delta Logo
6:00 am - 10:34 pm
ATH
-
ONT
26h 34m
2 stops
$639Delta
Sat, Aug 22 - Wed, Sep 2
British Airways Logo
12:47 pm - 2:10 am
ONT
-
ATH
27h 23m
2 stops
British Airways Logo
7:00 pm - 6:17 pm
ATH
-
ONT
57h 17m
2 stops
$640British Airways
Wed, Apr 8 - Wed, Apr 22
British Airways Logo
12:19 pm - 12:25 pm
ONT
-
ATH
38h 06m
2 stops
British Airways Logo
8:00 pm - 9:59 pm
ATH
-
ONT
35h 59m
2 stops
$666British Airways
Wed, Apr 29 - Tue, May 12
British Airways Logo
12:19 pm - 12:25 pm
ONT
-
ATH
38h 06m
2 stops
British Airways Logo
6:30 pm - 6:30 pm
ATH
-
ONT
34h 00m
2 stops
$673British Airways
Sat, Aug 22 - Wed, Sep 2
British Airways Logo
12:47 pm - 2:10 am
ONT
-
ATH
27h 23m
2 stops
British Airways Logo
12:00 pm - 9:28 pm
ATH
-
ONT
19h 28m
1 stop
$680British Airways
Sat, Mar 14 - Wed, May 13
United Airlines Logo
11:59 pm - 10:10 am
ONT
-
ATH
49h 11m
2 stops
United Airlines Logo
1:10 pm - 10:30 pm
ATH
-
ONT
43h 20m
2 stops
$683United Airlines
Thu, Apr 30 - Fri, May 8
United Airlines Logo
7:00 am - 10:35 am
ONT
-
ATH
17h 35m
1 stop
United Airlines Logo
12:35 pm - 10:30 pm
ATH
-
ONT
19h 55m
1 stop
$684United Airlines
Tue, Mar 17 - Wed, May 13
Delta Logo
10:25 pm - 9:35 am
ONT
-
ATH
26h 10m
2 stops
Delta Logo
9:45 am - 9:48 pm
ATH
-
ONT
22h 03m
1 stop
$688Delta
Tue, Mar 24 - Wed, Apr 1
British Airways Logo
3:19 pm - 1:20 am
ONT
-
ATH
25h 01m
2 stops
British Airways Logo
7:30 am - 10:19 pm
ATH
-
ONT
24h 49m
2 stops
$691British Airways
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 ($634) and British Airways ($640).

Find deals

Good to know

Low seasonFebruary
Cheapest flight$433
Best time to beat the crowds with an average 42% drop in price.
Most popular time to fly and prices are also 4% lower on average.
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 $257 for a one-way ticket and $634 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 9349 reviews
8.1Crew
7.3Comfort
6.6Food
7.7Boarding
7.1Entertainment
Airline reviews

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

2.0 MediocreHASSAN, Feb 2026
SFO - SNA
Read more United Airlines reviews

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

Women boarding passengers at the gate was absolutely rude and disrespectful of passengers. The flight attendant was absolutely delightful! Smiling and connected with the passengers. So happy. The seats are cramped and uncomfortable but I guess that’s just the way it is Communication regarding flight was excellent

it was a very short flight so my expectations were low.

Entertainment kept turning itself off. Gave up on watching a movie.

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Crew was great (professional, attentive, prompt). Snacks for 4 hrs flight is deplorable.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

Terrible. No customer service, no food, no drinks on a 6 hour premier economy booking.

Check-in and in-flight staff were better than average. The seat was a fair size but too hard and not enough padding. The cushion/pillow provided is poor (thin and seems to be disposable ,it provides no effective cushioning or support). Food was OK-ish but no choice of inflight snacks and no easy place to get drinks other than water (I could ask for juice by intruding into the staff area at the back of the plane) Entertainment was very good actually. Overall better than I expected from a US-based airline (sorry!) but compared to ANA or Singapore it was so-so. (I live in Japan so they are my comparative airlines)

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

Information on your arrival and departure airports

Ontario (ONT)
Athens (ATH)