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$289+ 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 10/30. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — CPH
Oct 29 — Nov 51
Wed 10/29
Wed 11/5
1 adult, Economy
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Cheap flight deals from Ontario to Europe

Keep the following information in mind while searching for Ontario to Europe flight deals. Data was last updated September 29, 2025.

Round-trip from

$422
(Delta)

One-way from

$289
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$999
From Ontario to Europe
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One-way flight from Ontario to Europe
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Highest demand for flights based on searches. 15% potential increase in price ($191 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($37 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 29, 2025.

This Delta deal was found by Cheapflights users on 9/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1210:00 pmONT - VCE
1 stop28h 35mDelta
Wed 11/59:50 amVCE - ONT
2 stops21h 32mDelta
Deal found 9/28$422
This Delta deal was found by Cheapflights users on 9/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/97:05 amONT - VCE
2 stops25h 15mDelta
Wed 12/246:10 amVCE - ONT
2 stops25h 23mDelta
Deal found 9/29$436
This Delta deal was found by Cheapflights users on 9/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2910:25 pmONT - FCO
1 stop24h 30mDelta
Wed 12/1010:05 amFCO - ONT
1 stop18h 34mDelta
Deal found 9/27$475
This lol.travel deal was found by Cheapflights users on 9/29. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/206:36 pmONT - FCO
1 stop34h 04mUnited Airlines
Wed 11/512:20 pmFCO - ONT
2 stops19h 31mUnited Airlines
Deal found 9/29$476
This lol.travel deal was found by Cheapflights users on 9/28. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/197:02 amONT - VCE
2 stops18h 08mUnited Airlines
Tue 11/46:45 amVCE - ONT
2 stops19h 49mUnited Airlines
Deal found 9/28$479
This KLM deal was found by Cheapflights users on 9/29. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/126:00 amONT - FCO
2 stops17h 40mMultiple Airlines
Wed 11/2610:05 amFCO - ONT
1 stop21h 59mMultiple Airlines
Deal found 9/29$480
This Delta deal was found by Cheapflights users on 9/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1010:25 pmONT - FCO
1 stop27h 05mDelta
Wed 11/2612:40 pmFCO - ONT
1 stop19h 24mDelta
Deal found 9/28$481
This KLM deal was found by Cheapflights users on 9/26. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/97:05 amONT - FCO
1 stop15h 50mKLM
Tue 11/256:10 amFCO - ONT
2 stops19h 59mKLM
Deal found 9/26$498
This United Airlines deal was found by Cheapflights users on 9/26. 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 11/95:05 amONT - FCO
2 stops42h 25mUnited Airlines
Tue 11/251:05 pmFCO - ONT
2 stops42h 26mUnited Airlines
Deal found 9/26$500
This Delta deal was found by Cheapflights users on 9/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/285:50 pmONT - FCO
2 stops28h 15mDelta
Tue 11/46:00 amFCO - ONT
2 stops25h 41mDelta
Deal found 9/28$501
This United Airlines deal was found by Cheapflights users on 9/28. 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 10/144:15 pmONT - VCE
2 stops32h 25mUnited Airlines
Fri 11/710:30 amVCE - ONT
2 stops20h 19mUnited Airlines
Deal found 9/28$503
This United Airlines deal was found by Cheapflights users on 9/27. 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 10/186:36 pmONT - FCO
1 stop33h 44mUnited Airlines
Thu 11/131:30 pmFCO - ONT
2 stops18h 21mUnited Airlines
Deal found 9/27$503

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 September 29, 2025.
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

OntarioVenice

ONT - VCE

ONTVCE

Ontario

Sun 10/12

10:00 pm-11:35 am

1 stop28h 35m

Venice Marco Polo

Wed 11/5

9:50 am-10:22 pm

2 stops21h 32m

$422

OntarioVenice

ONT - VCE

ONTVCE

Ontario

Sun 10/12

10:00 pm-11:35 am

1 stop28h 35m

Venice Marco Polo

Thu 11/6

6:10 am-10:22 pm

2 stops25h 12m

$422

OntarioRome

ONT - FCO

ONTFCO

Ontario

Wed 11/12

7:05 am-10:30 am

1 stop18h 25m

Rome Fiumicino

Wed 11/26

12:40 pm-11:04 pm

1 stop19h 24m

$475

OntarioRome

ONT - FCO

ONTFCO

Ontario

Sat 11/29

10:25 pm-7:55 am

1 stop24h 30m

Rome Fiumicino

Wed 12/10

10:05 am-7:39 pm

1 stop18h 34m

$475

OntarioRome

ONT - FCO

ONTFCO

Ontario

Tue 11/11

7:05 am-10:30 am

1 stop18h 25m

Rome Fiumicino

Wed 11/26

12:40 pm-11:04 pm

1 stop19h 24m

$475

OntarioVenice

ONT - VCE

ONTVCE

Ontario

Tue 10/14

4:15 pm-9:40 am

2 stops32h 25m

Venice Marco Polo

Fri 11/7

10:30 am-9:49 pm

2 stops20h 19m

$503

OntarioMadrid

ONT - MAD

ONTMAD

Ontario

Tue 11/18

6:05 am-9:15 am

2 stops18h 10m

Madrid Barajas

Wed 11/26

1:35 pm-3:21 pm

2 stops34h 46m

$504

OntarioVenice

ONT - VCE

ONTVCE

Ontario

Wed 10/22

6:00 am-9:05 am

2 stops18h 05m

Venice Marco Polo

Tue 11/4

1:50 pm-10:51 pm

2 stops18h 01m

$507

OntarioRome

ONT - FCO

ONTFCO

Ontario

Wed 2/25

5:40 am-8:30 am

2 stops17h 50m

Rome Fiumicino

Tue 3/3

7:05 am-9:19 pm

2 stops23h 14m

$507

OntarioRome

ONT - FCO

ONTFCO

Ontario

Tue 1/27

5:05 am-7:55 am

2 stops17h 50m

Rome Fiumicino

Tue 2/10

9:45 am-9:58 pm

2 stops21h 13m

$507

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/27

Showing 1-10 of 60 results
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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, November is the cheapest month in which you can book a flight from Ontario to Europe (average of $523). Flying from Ontario to Europe in June is currently the most expensive (average of $910). 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.

What is the cheapest time of day to fly from ONT to EU?

Find hourly flight availability from Ontario to Europe. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 29, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Europe as you normally would.

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 September 29, 2025.
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
8.0
Very good
7,964 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

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
8.0
Very good
7,964 reviews
Delta
8.0
Very good
7,964 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

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
8,924 reviews
Delta
8.0
Very good
7,964 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

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
10,000 reviews
Delta
8.0
Very good
7,964 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

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
2,959 reviews
Delta
8.0
Very good
7,964 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

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
7,406 reviews
Delta
8.0
Very good
7,964 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

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 $671, Delta can have you in Europe from Ontario in 15h 40m. 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 cheapest airlines to fly from Ontario to Europe one-way?

    To fly one-way, consider booking your trip with KLM, which is currently one of the cheapest options available, starting at $353. Iberia flights start at $377 while deals on British Airways start at $377 one-way.

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

    The most popular route from Ontario to Europe is Ontario - Paris Charles de Gaulle. You may also consider Ontario - London Heathrow 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, November is the cheapest month in which you can book a flight from Ontario to Europe (average of $523). Flying from Ontario to Europe in June is currently the most expensive (average of $910). 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 7 airlines flying from Ontario to Europe

Discover the top 7 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 September 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$444Average$872FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$469Average$884FlexibilityNo cancel feeOn-time72%
British AirwaysCheapest$489Average$925FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$492Average$842FlexibilityNo cancel feeOn-time69%
IberiaCheapest$496Average$850FlexibilityNo cancel feeOn-time77%
KLMCheapest$580Average$884FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$621Average$1,101FlexibilityNo cancel feeOn-time71%

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