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$226+ Cheap flights from Ontario (ONT) to Europe

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — CPH
Mar 10 — Mar 171
Tue 3/10
Tue 3/17
1 adult, Economy
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Cheap flight deals from Ontario to Europe

Cheapest flights from Ontario to Europe
Explore the most affordable flight options available from Ontario to Europe. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 8, 2026.

This United Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/911:59 pm
ONT
-
ATH
2 stops24h 06m
United Airlines
Mon 3/1612:15 pm
ATH
-
ONT
2 stops38h 26m
United Airlines
Deal found 2/7$480
This United Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:37 pm
ONT
-
ATH
2 stops21h 03m
United Airlines
Mon 3/1612:15 pm
ATH
-
ONT
2 stops38h 26m
United Airlines
Deal found 2/5$483
This Kissandfly.com deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/56:37 pm
ONT
-
ATH
2 stops21h 03m
Lufthansa
Thu 3/196:25 am
ATH
-
ONT
2 stops25h 32m
Lufthansa
Deal found 2/4$488
This United Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/245:15 am
ONT
-
FCO
2 stops33h 45m
United Airlines
Tue 3/3111:30 am
FCO
-
ONT
2 stops43h 56m
United Airlines
Deal found 2/7$496
This United Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/46:09 am
ONT
-
FCO
2 stops31h 51m
United Airlines
Thu 3/1210:15 am
FCO
-
ONT
2 stops44h 42m
United Airlines
Deal found 2/7$501
This United Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/811:59 pm
ONT
-
FCO
1 stop23h 46m
United Airlines
Wed 3/189:45 am
FCO
-
ONT
1 stop20h 33m
United Airlines
Deal found 2/7$508
This United Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/105:15 am
ONT
-
MAD
2 stops20h 00m
United Airlines
Wed 3/1812:40 pm
MAD
-
ONT
2 stops41h 38m
United Airlines
Deal found 2/7$510
This United Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/255:00 am
ONT
-
FCO
2 stops17h 45m
United Airlines
Tue 3/37:05 am
FCO
-
ONT
2 stops22h 45m
United Airlines
Deal found 2/6$511
This oojo deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/92:39 pm
ONT
-
MAD
2 stops19h 51m
British Airways
Wed 3/1812:30 pm
MAD
-
ONT
1 stop16h 54m
British Airways
Deal found 2/6$512
This United Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/256:09 am
ONT
-
FCO
2 stops16h 36m
United Airlines
Thu 3/59:45 am
FCO
-
ONT
1 stop21h 33m
United Airlines
Deal found 2/5$513
This United Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/51:40 pm
ONT
-
ATH
2 stops24h 50m
United Airlines
Wed 3/1110:55 am
ATH
-
ONT
2 stops39h 46m
United Airlines
Deal found 2/5$514
This United Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/51:40 pm
ONT
-
ATH
2 stops24h 50m
United Airlines
Thu 3/126:25 am
ATH
-
ONT
2 stops25h 32m
United Airlines
Deal found 2/5$516

Find flight deals from Ontario to Europe

Keep the following information in mind while searching for Ontario to Europe flight deals. Data was last updated February 8, 2026.

Round-trip from

$480
(United Airlines)

One-way from

$226
(oojo)

Popular in

June

Cheapest in

February

Average price

$746
From Ontario to Europe
Search Deals
One-way flight from Ontario to Europe
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($227 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Europe 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, Cheapflights users made 2,558,603 searches. Data last updated February 8, 2026.
Use the filters below to find and compare flights from Ontario to Europe that are best for you.

Fly from

Ontario

Fly to

Europe

Route

Depart

Return

Price

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 3/9

11:59 pm-9:05 am

2 stops24h 06m

Athens Eleftherios V.

Mon 3/16

12:15 pm-5:41 pm

2 stops38h 26m

$480

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 3/5

1:40 pm-12:30 am

2 stops24h 50m

Athens Eleftherios V.

Thu 3/12

6:25 am-10:57 pm

2 stops25h 32m

$516

OntarioRome

ONT - FCO

ONTFCO

Ontario

Wed 2/25

7:30 am-3:15 pm

2 stops22h 45m

Rome Fiumicino

Tue 3/3

12:40 pm-12:02 pm

1 stop32h 22m

$518

OntarioRome

ONT - FCO

ONTFCO

Ontario

Sat 4/11

6:49 pm-1:20 pm

1 stop33h 31m

Rome Fiumicino

Thu 4/23

11:30 am-10:26 pm

2 stops43h 56m

$518

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 3/5

1:40 pm-12:30 am

2 stops24h 50m

Athens Eleftherios V.

Sun 3/8

11:25 am-9:18 pm

2 stops43h 53m

$521

OntarioMadrid

ONT - MAD

ONTMAD

Ontario

Tue 3/3

5:00 am-8:00 am

2 stops18h 00m

Madrid Barajas

Thu 3/19

6:00 am-5:41 pm

2 stops19h 41m

$529

OntarioMadrid

ONT - MAD

ONTMAD

Ontario

Tue 3/10

6:15 am-9:15 am

2 stops19h 00m

Madrid Barajas

Tue 3/17

11:15 am-10:57 pm

2 stops19h 42m

$530

OntarioMadrid

ONT - MAD

ONTMAD

Ontario

Tue 3/10

6:15 am-9:15 am

2 stops19h 00m

Madrid Barajas

Tue 3/31

11:15 am-12:14 pm

2 stops33h 59m

$530

OntarioRome

ONT - FCO

ONTFCO

Ontario

Sun 4/5

11:05 am-1:20 pm

1 stop17h 15m

Rome Fiumicino

Wed 4/15

10:20 am-10:26 pm

2 stops21h 06m

$543

OntarioAmsterdam

ONT - AMS

ONTAMS

Ontario

Mon 3/9

12:57 pm-12:25 pm

2 stops39h 28m

Amsterdam Schiphol

Tue 3/24

10:45 am-11:51 pm

2 stops21h 06m

$548

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/7

Showing 1-10 of 60 results
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6

Best time to book a flight from Ontario to Europe

Have a flexible travel schedule? Discover the best time to fly to Europe from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Europe

What is the cheapest month to book a flight from Ontario to Europe?

Currently, February is the cheapest month in which you can book a flight from Ontario to Europe (average of $340). Flying from Ontario to Europe in June is currently the most expensive (average of $582). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Europe

Get insights into the airlines that provide service to Europe. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Europe. Reviews last updated February 8, 2026.
See what other customers who have flown with Delta, United Airlines, and American Airlines from Ontario to Europe have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,172 reviews

Overall

7.9

Food

7.2

Comfort

7.9

Crew

8.5

Entertainment

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
7.9
Good
8,172 reviews
Delta
7.9
Good
8,172 reviews

Overall

7.9

Food

7.2

Comfort

7.9

Crew

8.5

Entertainment

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
9,254 reviews
Delta
7.9
Good
8,172 reviews

Overall

7.9

Food

7.2

Comfort

7.9

Crew

8.5

Entertainment

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
11,249 reviews
Delta
7.9
Good
8,172 reviews

Overall

7.9

Food

7.2

Comfort

7.9

Crew

8.5

Entertainment

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Iberia
7.0
Good
3,106 reviews
Delta
7.9
Good
8,172 reviews

Overall

7.9

Food

7.2

Comfort

7.9

Crew

8.5

Entertainment

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
British Airways
6.7
Okay
7,720 reviews
Delta
7.9
Good
8,172 reviews

Overall

7.9

Food

7.2

Comfort

7.9

Crew

8.5

Entertainment

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Europe. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Europe?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to Europe.

  • How long is the flight from Ontario to Europe?

    For as low as $512, United Airlines can have you in Europe from Ontario in 19h 51m. Airlines will cover a distance of 5790 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the most popular routes from Ontario to Europe?

    The most popular route from Ontario to Europe is Ontario - London Heathrow. You may also consider Ontario - Paris Charles de Gaulle or Ontario - Rome Fiumicino.

  • Can I find deals for flights from Ontario to Europe that include hotel bookings?

    Yes. In addition to deals on Ontario to Europe flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Europe?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Europe.

  • Can I find deals for business class flights from Ontario to Europe?

    Yes. Cheapflights offers flight deals from Ontario to Europe by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Europe?

    Currently, February is the cheapest month in which you can book a flight from Ontario to Europe (average of $340). Flying from Ontario to Europe in June is currently the most expensive (average of $582). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Ontario to Europe

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Ontario to Europe

Discover the top 6 airlines that operate flights from Ontario to Europe. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$439Average$1,059FlexibilityNo cancel feeOn-time71%
DeltaCheapest$444Average$880FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$487Average$938FlexibilityNo cancel feeOn-time70%
IberiaCheapest$497Average$862FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$508Average$870FlexibilityNo cancel feeOn-time69%
KLMCheapest$734Average$963FlexibilityNo cancel feeOn-time75%

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