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$563+ Cheap flights from Cologne (CGN) to Ontario (ONT)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/28. Fares are subject to change and may not be available on all flights or dates of travel.
CGN — ONT
May 6 — May 131
Tue 5/6
Tue 5/13
1 adult, Economy
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Cheap flight deals from Cologne to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Cologne (CGN) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 1, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$563
(United Airlines)

Popular in

July

Cheapest in

March

Average price

$666
Provider with most accurate pricing for Cologne Köln/Bonn-Los Angeles flight deals.
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Provider most trusted by Cheapflights users for Cologne Köln/Bonn-Los Angeles flights.
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From Cologne Köln/Bonn to Ontario
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Highest demand for flights based on searches. 13% potential increase in price ($111 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($25 potential savings vs. average RT price).
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Average for round-trip flights in May 2025
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Find flight deals from Cologne to Ontario

Cheapest flights from Cologne to Ontario
Explore the most affordable flight options available from Cologne to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.

This United Airlines deal was found by Cheapflights users on 4/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2812:55 pmCGN - ONT
2 stops17h 09mUnited Airlines
Mon 6/21:36 pmONT - CGN
2 stops20h 44mUnited Airlines
Deal found 4/29$563
This British Airways deal was found by Cheapflights users on 4/29. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/210:15 amCGN - ONT
2 stops20h 25mBritish Airways
Wed 10/155:02 pmONT - CGN
2 stops18h 58mBritish Airways
Deal found 4/29$671

Cheapflights Fare Finder

Customize your flight search to find flights from Cologne to Ontario 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 May 1, 2025.
Use the filters below to find and compare flights from Cologne to Ontario that are best for you.

Fly from

Cologne

Fly to

Ontario

Route

Depart

Return

Price

CologneOntario

CGN - ONT

CGNONT

Cologne Köln/Bonn

Wed 5/28

12:55 pm-9:04 pm

2 stops17h 09m

Ontario

Mon 6/2

1:36 pm-7:20 pm

2 stops20h 44m

$563

CologneOntario

CGN - ONT

CGNONT

Cologne Köln/Bonn

Thu 10/2

10:15 am-9:40 pm

2 stops20h 25m

Ontario

Wed 10/15

5:02 pm-9:00 pm

2 stops18h 58m

$671

CologneOntario

CGN - ONT

CGNONT

Cologne Köln/Bonn

Wed 5/14

10:15 pm-6:23 pm

2 stops29h 08m

$1,776

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Best time to book a flight from Cologne to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Cologne 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 Cologne to Ontario

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

Currently, August is the cheapest month in which you can book a flight from Cologne to Ontario (average of $246). Flying from Cologne to Ontario in March is currently the most expensive (average of $328). 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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated May 1, 2025.
United Airlines
7.4
Good
8,696 reviews

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.
United Airlines
7.4
Good
8,696 reviews
United Airlines
7.4
Good
8,696 reviews

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.
British Airways
6.6
Okay
6,845 reviews
United Airlines
7.4
Good
8,696 reviews

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.

Related info for your journey

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

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Cologne to Ontario 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 Cologne to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Cologne to Ontario (average of $246). Flying from Cologne to Ontario in March is currently the most expensive (average of $328). 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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