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Cheap flights from Ontario to Athens from $291

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Athens departing on 9/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Ontario to Athens

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
6:00 am - 11:00 am
ONT
-
ATH
43h 00m
2 stops
Delta Logo
10:05 am - 11:36 am
ATH
-
ONT
59h 31m
2 stops
$679Delta
Sun, Apr 5 - Tue, Apr 21
KLM Logo
10:25 pm - 11:00 am
ONT
-
ATH
26h 35m
1 stop
KLM Logo
9:45 am - 9:00 pm
ATH
-
ONT
21h 15m
1 stop
$687KLM
Tue, Apr 7 - Tue, Apr 21
Air France Logo
12:57 pm - 11:00 am
ONT
-
ATH
36h 03m
1 stop
Air France Logo
9:45 am - 9:00 pm
ATH
-
ONT
21h 15m
1 stop
$690Air France
Mon, Apr 6 - Tue, Apr 21
United Airlines Logo
7:00 am - 10:35 am
ONT
-
ATH
17h 35m
1 stop
United Airlines Logo
1:10 pm - 6:19 pm
ATH
-
ONT
39h 09m
2 stops
$691United Airlines
Sun, Aug 23 - Fri, Sep 11
United Airlines Logo
7:00 am - 10:35 am
ONT
-
ATH
17h 35m
1 stop
United Airlines Logo
12:35 pm - 10:35 pm
ATH
-
ONT
20h 00m
1 stop
$694United Airlines
Sun, Apr 26 - Wed, May 6
Multiple Airlines Logo
12:57 pm - 11:00 am
ONT
-
ATH
36h 03m
1 stop
Multiple Airlines Logo
6:00 am - 5:15 pm
ATH
-
ONT
21h 15m
2 stops
$695Multiple Airlines
Mon, Apr 6 - Tue, Apr 21
Multiple Airlines Logo
12:57 pm - 11:00 am
ONT
-
ATH
36h 03m
1 stop
Multiple Airlines Logo
6:00 am - 5:15 pm
ATH
-
ONT
21h 15m
2 stops
$696Multiple Airlines
Mon, Apr 6 - Tue, Apr 21
Delta Logo
6:00 am - 11:00 pm
ONT
-
ATH
31h 00m
2 stops
Delta Logo
9:45 am - 6:36 pm
ATH
-
ONT
18h 51m
1 stop
$698Delta
Tue, May 5 - Thu, May 14
KLM Logo
6:00 am - 4:30 pm
ONT
-
ATH
24h 30m
2 stops
KLM Logo
1:10 pm - 11:44 pm
ATH
-
ONT
20h 34m
2 stops
$699KLM
Mon, Apr 6 - Wed, Apr 22
KLM Logo
5:05 pm - 1:15 am
ONT
-
ATH
22h 10m
2 stops
KLM Logo
1:10 pm - 11:44 pm
ATH
-
ONT
20h 34m
2 stops
$700KLM
Sun, Apr 19 - Wed, Apr 29

KLM flights from Ontario to Athens

Our best KLM deals on Ontario to Athens flight tickets
KLM
Apr 7
ONT10:25 pmOntario
26h 35m
1 stop
ATH11:00 amAthens Eleftherios V.
Apr 21
ATH9:45 amAthens Eleftherios V.
21h 15m
1 stop
ONT9:00 pmOntario
$687
KLM
Apr 6
ONT6:00 amOntario
24h 30m
2 stops
ATH4:30 pmAthens Eleftherios V.
Apr 22
ATH1:10 pmAthens Eleftherios V.
20h 34m
2 stops
ONT11:44 pmOntario
$699
KLM
Apr 19
ONT5:05 pmOntario
22h 10m
2 stops
ATH1:15 amAthens Eleftherios V.
Apr 29
ATH1:10 pmAthens Eleftherios V.
20h 34m
2 stops
ONT11:44 pmOntario
$700

Air France flights from Ontario to Athens

Our best Air France deals on Ontario to Athens flight tickets
Air France
Apr 6
ONT12:57 pmOntario
36h 03m
1 stop
ATH11:00 amAthens Eleftherios V.
Apr 21
ATH9:45 amAthens Eleftherios V.
21h 15m
1 stop
ONT9:00 pmOntario
$690
Air France
Apr 6
ONT12:57 pmOntario
36h 03m
1 stop
ATH11:00 amAthens Eleftherios V.
Apr 22
ATH9:45 amAthens Eleftherios V.
21h 15m
1 stop
ONT9:00 pmOntario
$741

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Athens that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated March 10, 2026.
Use the filters below to find and compare flights from Ontario to Athens that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 4/5

6:00 am-11:00 am

2 stops43h 00m

Athens Eleftherios V.

Tue 4/21

10:05 am-11:36 am

2 stops59h 31m

$679

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 4/7

10:25 pm-11:00 am

1 stop26h 35m

Athens Eleftherios V.

Tue 4/21

9:45 am-9:00 pm

1 stop21h 15m

$687

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 4/6

12:57 pm-11:00 am

1 stop36h 03m

Athens Eleftherios V.

Tue 4/21

9:45 am-9:00 pm

1 stop21h 15m

$690

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 8/23

7:00 am-10:35 am

1 stop17h 35m

Athens Eleftherios V.

Fri 9/11

1:10 pm-6:19 pm

2 stops39h 09m

$691
Quickest round-trip

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 4/26

7:00 am-10:35 am

1 stop17h 35m

Athens Eleftherios V.

Wed 5/6

12:35 pm-10:35 pm

1 stop20h 00m

$694

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 4/6

12:57 pm-11:00 am

1 stop36h 03m

Athens Eleftherios V.

Tue 4/21

6:00 am-5:15 pm

2 stops21h 15m

$695

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 4/6

12:57 pm-11:00 am

1 stop36h 03m

Athens Eleftherios V.

Tue 4/21

6:00 am-5:15 pm

2 stops21h 15m

$696

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 5/5

6:00 am-11:00 pm

2 stops31h 00m

Athens Eleftherios V.

Thu 5/14

9:45 am-6:36 pm

1 stop18h 51m

$698

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 4/6

6:00 am-4:30 pm

2 stops24h 30m

Athens Eleftherios V.

Wed 4/22

1:10 pm-11:44 pm

2 stops20h 34m

$699

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 4/19

5:05 pm-1:15 am

2 stops22h 10m

Athens Eleftherios V.

Wed 4/29

1:10 pm-11:44 pm

2 stops20h 34m

$700

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Athens from

How to get the cheapest flight ticket from Ontario to Athens

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Can stopping save me money on Ontario to Athens flights?

You could potentially save up to 52% on your flight if you consider stops on a Ontario to Athens flight.

When to book flights from Ontario to Athens

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Athens according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Athens (ONT to ATH) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Athens

Fastest flight time

18h 45m

Direct flights

None
The fastest flight from Ontario to Athens takes 18h 45m
There are no direct flights from Ontario to Athens. There are no popular flight routes from Ontario to Athens.
Search flight deals

  • How far is Ontario to Athens Eleftherios V. by plane?

    The distance between Ontario and Athens Eleftherios V. is about 6871.5 mi. A reasonable flight in good conditions will take 18h 45m.

  • When did momondo last update prices for flights from Ontario Airport to Athens Eleftherios V. Airport?

    Prices for flights from Ontario Airport to Athens Eleftherios V. Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Ontario Airport to Athens Eleftherios V. Airport?

  • How old do you have to be to fly from Ontario Airport to Athens Eleftherios V. Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Athens Eleftherios V. Airport.

  • What documentation or ID do you need to fly to Athens Eleftherios V. Airport?

    The required travel and health documents for your Athens Eleftherios V. Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Athens Eleftherios V. Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from Ontario to Athens?

Best airlines flying from Ontario to Athens

Compare and see reviews for airlines that fly from Ontario to Athens with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $588Free CancellationRating
7.4
9,409 reviews
Search United Airlines flights

Traveling to a place near Athens?

Book flights to Athens if you plan to visit one of these locations
Piraeus
Glyfada
Marathon
Hydra
Skala
Loutraki
Aegina
Tolo
Corinth
Agia Marina
Chalcis
Porto Cheli
Galaxidi

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Athens?

It is quick and easy to find Ontario to Athens flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Athens that suits you.

Can I find flights from Ontario to Athens with flexible booking policies on momondo?

Flights from Ontario to Athens with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Ontario to Athens?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Athens from Ontario.

I’m not ready to book a flight from Ontario to Athens right now. Can momondo alert me if prices change?

Price alerts on flights to Athens from Ontario are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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