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$236+ 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 14 — Mar 211
Sat 3/14
Sat 3/21
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 12, 2026.

This United Airlines deal was found by Cheapflights users on 2/9. 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 2/248:00 am
ONT
-
LIS
2 stops16h 10m
United Airlines
Thu 3/1211:20 am
LIS
-
ONT
2 stops41h 58m
United Airlines
Deal found 2/9$492
This United Airlines deal was found by Cheapflights users on 2/8. 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 3/96:00 am
ONT
-
LIS
2 stops19h 10m
United Airlines
Tue 3/175:00 am
LIS
-
ONT
2 stops22h 50m
United Airlines
Deal found 2/8$500
This United Airlines deal was found by Cheapflights users on 2/9. 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 4/146:05 am
ONT
-
LIS
2 stops18h 15m
United Airlines
Tue 4/216:15 am
LIS
-
ONT
2 stops22h 21m
United Airlines
Deal found 2/9$502
This United Airlines deal was found by Cheapflights users on 2/11. 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 3/16:09 am
ONT
-
FCO
2 stops40h 36m
United Airlines
Tue 3/1012:10 pm
FCO
-
ONT
2 stops42h 08m
United Airlines
Deal found 2/11$503
This American Airlines deal was found by Cheapflights users on 2/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/232:39 pm
ONT
-
FCO
2 stops17h 16m
American Airlines
Fri 3/611:35 am
FCO
-
ONT
1 stop19h 54m
American Airlines
Deal found 2/9$505
This United Airlines deal was found by Cheapflights users on 2/10. 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.
Sat 3/711:59 pm
ONT
-
FCO
1 stop22h 46m
United Airlines
Wed 3/187:05 am
FCO
-
ONT
2 stops23h 52m
United Airlines
Deal found 2/10$507
This United Airlines deal was found by Cheapflights users on 2/11. 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 8/111:00 pm
ONT
-
FCO
1 stop14h 20m
United Airlines
Thu 8/272:20 pm
FCO
-
ONT
1 stop15h 00m
United Airlines
Deal found 2/11$508
This oojo deal was found by Cheapflights users on 2/11. 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.
Sun 4/1912:19 pm
ONT
-
LIS
2 stops26h 46m
British Airways
Fri 5/16:55 pm
LIS
-
ONT
2 stops29h 27m
British Airways
Deal found 2/11$509
This United Airlines deal was found by Cheapflights users on 2/10. 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 2/175:00 am
ONT
-
FCO
2 stops19h 25m
United Airlines
Tue 3/109:45 am
FCO
-
ONT
2 stops21h 12m
United Airlines
Deal found 2/10$510
This United Airlines deal was found by Cheapflights users on 2/9. 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
-
MAD
2 stops18h 06m
United Airlines
Wed 3/41:35 pm
MAD
-
ONT
2 stops41h 43m
United Airlines
Deal found 2/9$510
This United Airlines deal was found by Cheapflights users on 2/9. 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 stops19h 36m
United Airlines
Deal found 2/9$511
This United Airlines deal was found by Cheapflights users on 2/10. 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 2/178:00 am
ONT
-
LIS
2 stops16h 10m
United Airlines
Tue 2/2410:15 am
LIS
-
ONT
2 stops18h 35m
United Airlines
Deal found 2/10$512

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 12, 2026.

Round-trip from

$492
(United Airlines)

One-way from

$236
(United Airlines)

Popular in

June

Cheapest in

January

Average price

$720
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 ($229 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($40 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 12, 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

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 2/24

8:00 am-8:10 am

2 stops16h 10m

Lisbon Humberto Delgado

Thu 3/12

11:20 am-10:18 pm

2 stops41h 58m

$492

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Mon 3/9

6:00 am-8:10 am

2 stops19h 10m

Lisbon Humberto Delgado

Tue 3/17

5:00 am-8:50 pm

2 stops22h 50m

$500

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Mon 3/9

6:00 am-8:10 am

2 stops19h 10m

Lisbon Humberto Delgado

Tue 3/24

6:10 am-10:18 pm

2 stops23h 08m

$502

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 3/3

8:00 am-10:15 am

2 stops18h 15m

Lisbon Humberto Delgado

Tue 3/17

6:10 am-10:18 pm

2 stops23h 08m

$502

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 3/10

6:00 am-10:15 am

2 stops21h 15m

Lisbon Humberto Delgado

Wed 3/18

6:10 am-10:57 pm

2 stops23h 47m

$502

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 4/14

6:05 am-8:20 am

2 stops18h 15m

Lisbon Humberto Delgado

Tue 4/21

6:15 am-8:36 pm

2 stops22h 21m

$502

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Mon 2/23

6:00 am-8:10 am

2 stops18h 10m

Lisbon Humberto Delgado

Wed 3/4

6:10 am-5:41 pm

2 stops19h 31m

$502

OntarioRome

ONT - FCO

ONTFCO

Ontario

Tue 3/17

10:25 pm-6:55 am

1 stop24h 30m

Rome Fiumicino

Thu 4/2

9:45 am-9:00 pm

1 stop20h 15m

$508

OntarioRome

ONT - FCO

ONTFCO

Ontario

Tue 8/11

1:00 pm-12:20 pm

1 stop14h 20m

Rome Fiumicino

Fri 8/28

2:20 pm-8:20 pm

1 stop15h 00m

$508

OntarioRome

ONT - FCO

ONTFCO

Ontario

Sun 3/15

11:59 pm-7:45 am

1 stop23h 46m

Rome Fiumicino

Tue 3/31

2:20 pm-8:36 pm

1 stop15h 16m

$508

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/12

Showing 1-10 of 60 results
1
2
3
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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 $335). Flying from Ontario to Europe in June is currently the most expensive (average of $581). 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 12, 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
8,181 reviews

Entertainment

7.8

Overall

7.9

Boarding

8.1

Food

7.2

Comfort

7.9

Crew

8.5

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
8,181 reviews
Delta
7.9
Good
8,181 reviews

Entertainment

7.8

Overall

7.9

Boarding

8.1

Food

7.2

Comfort

7.9

Crew

8.5

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
9,279 reviews
Delta
7.9
Good
8,181 reviews

Entertainment

7.8

Overall

7.9

Boarding

8.1

Food

7.2

Comfort

7.9

Crew

8.5

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
11,271 reviews
Delta
7.9
Good
8,181 reviews

Entertainment

7.8

Overall

7.9

Boarding

8.1

Food

7.2

Comfort

7.9

Crew

8.5

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
3,113 reviews
Delta
7.9
Good
8,181 reviews

Entertainment

7.8

Overall

7.9

Boarding

8.1

Food

7.2

Comfort

7.9

Crew

8.5

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
7,731 reviews
Delta
7.9
Good
8,181 reviews

Entertainment

7.8

Overall

7.9

Boarding

8.1

Food

7.2

Comfort

7.9

Crew

8.5

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 $626, United Airlines can have you in Europe from Ontario in 15h 31m. Airlines will cover a distance of 5407 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 - Rome Fiumicino or Ontario - Paris Charles de Gaulle.

  • 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 $335). Flying from Ontario to Europe in June is currently the most expensive (average of $581). 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 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$439Average$949FlexibilityNo cancel feeOn-time71%
DeltaCheapest$444Average$888FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$497Average$862FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$504Average$968FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$515Average$890FlexibilityNo cancel feeOn-time69%
KLMCheapest$580Average$808FlexibilityNo cancel feeOn-time75%

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