$438 Cheap Flights from Cologne (CGN) to Ontario (ONT)

View $438 flight on Sat, Jan 17, 2026Opens in a new window

Popular airlines from Cologne - Bonn Airport (CGN) to Los Angeles - Ontario Intl. Airport (ONT)

Cheap Flights from Cologne to Ontario (CGN-ONT)

Prices were available within the past 7 days and start at $438 for one-way flights and $659 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Sat, Jan 17 - Sat, Mar 28
CGN
Cologne
ONT
Ontario
$659 Roundtrip, found 2 hours ago
$659
Roundtrip
found 2 hours ago
Select British Airways flight, departing Sat, Jan 17 from Cologne to Ontario, returning Sat, Mar 28, priced at $659 found 2 hours ago
British Airways
Sun, Mar 15 - Tue, Apr 14
CGN
Cologne
ONT
Ontario
$662 Roundtrip, found 3 days ago
$662
Roundtrip
found 3 days ago
Select British Airways flight, departing Sun, Mar 15 from Cologne to Ontario, returning Tue, Apr 14, priced at $662 found 3 days ago
British Airways
Sat, Jan 17 - Sat, Mar 28
CGN
Cologne
ONT
Ontario
$815 Roundtrip, found 2 hours ago
$815
Roundtrip
found 2 hours ago
Select British Airways flight, departing Sat, Jan 17 from Cologne to Ontario, returning Sat, Mar 28, priced at $815 found 2 hours ago
British Airways
Sun, Mar 15 - Tue, Apr 14
CGN
Cologne
ONT
Ontario
$819 Roundtrip, found 3 days ago
$819
Roundtrip
found 3 days ago
Select British Airways flight, departing Sun, Mar 15 from Cologne to Ontario, returning Tue, Apr 14, priced at $819 found 3 days ago
British Airways
Fri, Nov 7 - Fri, May 1
CGN
Cologne
ONT
Ontario
$906 Roundtrip, found 2 days ago
$906
Roundtrip
found 2 days ago
Select British Airways flight, departing Fri, Nov 7 from Cologne to Ontario, returning Fri, May 1, priced at $906 found 2 days ago
British Airways
Sat, Jan 17 - Sat, Mar 28
CGN
Cologne
ONT
Ontario
$954 Roundtrip, found 2 hours ago
$954
Roundtrip
found 2 hours ago
Select British Airways flight, departing Sat, Jan 17 from Cologne to Ontario, returning Sat, Mar 28, priced at $954 found 2 hours ago
British Airways
Sun, Mar 15 - Tue, Apr 14
CGN
Cologne
ONT
Ontario
$959 Roundtrip, found 3 days ago
$959
Roundtrip
found 3 days ago
Select British Airways flight, departing Sun, Mar 15 from Cologne to Ontario, returning Tue, Apr 14, priced at $959 found 3 days ago
British Airways
Tue, Oct 28 - Tue, Nov 11
CGN
Cologne
ONT
Ontario
$1,021 Roundtrip, found 4 days ago
$1,021
Roundtrip
found 4 days ago
Select British Airways flight, departing Tue, Oct 28 from Cologne to Ontario, returning Tue, Nov 11, priced at $1,021 found 4 days ago
British Airways
Fri, Nov 7 - Fri, May 1
CGN
Cologne
ONT
Ontario
$1,046 Roundtrip, found 2 days ago
$1,046
Roundtrip
found 2 days ago
Select British Airways flight, departing Fri, Nov 7 from Cologne to Ontario, returning Fri, May 1, priced at $1,046 found 2 days ago
British Airways
Sat, Mar 28 - Wed, Apr 8
CGN
Cologne
ONT
Ontario
$1,306 Roundtrip, found 6 days ago
$1,306
Roundtrip
found 6 days ago
Select British Airways flight, departing Sat, Mar 28 from Cologne to Ontario, returning Wed, Apr 8, priced at $1,306 found 6 days ago
Flights from Cologne (CGN) to Ontario (ONT)
Origin airport
Cologne - Bonn
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
British Airways
Roundtrip price
$659
Distance
5674 mi

Cologne to Ontario Flights

The cheapest times to fly from Cologne to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Cologne to Ontario are during the month of January. You can find some of the cheapest flights from Cologne to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Cologne to Ontario

Sunday is one of the best days to book for cheap flights from Cologne to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Cologne to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Cologne to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $438 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Cologne to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Cologne to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Cologne - Bonn Airport (CGN) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Get a cheap one-way flight from $438 or cheap return flight from $659 from Cologne - Bonn Airport (CGN) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Cologne - Bonn Airport (CGN) to Los Angeles - Ontario Intl. Airport (ONT)?
Planning your trip for January may help you find better deals, as it's the cheapest month for flights between CGN and ONT. You'll usually find the lowest fares during off-peak months.
What is the cheapest airline that flies from Cologne - Bonn Airport (CGN) to Los Angeles - Ontario Intl. Airport (ONT)?
Use the filter tool on Expedia to compare different airlines and find the cheapest carrier that'll fly you from CGN to ONT. Then, sort your results by "Price (lowest to highest)" to snap up the best deal available.
How many flights per day from Cologne - Bonn Airport (CGN) to Los Angeles - Ontario Intl. Airport (ONT)?
Direct flights from Cologne - Bonn Airport (CGN) to Los Angeles - Ontario Intl. Airport (ONT) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from CGN to ONT?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Cologne - Bonn Airport (CGN) to Los Angeles - Ontario Intl. Airport (ONT)?
To land at Los Angeles - Ontario Intl. Airport (ONT) on schedule, opt for a flight that leaves from Cologne - Bonn Airport (CGN) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Cologne - Bonn Airport (CGN) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Last-minute bookings from CGN to ONT are generally more expensive. For the best rates, start searching for flights early. That being said, if you can play around with your travel dates, you may find a cheap fare just before your departure.
Is it cheaper to book a CGN to ONT flight and hotel package?
Booking a CGN to ONT flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip in one place. Pick from our impressive range of hotels and then add car rentals, activities and flights to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Cologne - Bonn Airport (CGN) to Los Angeles - Ontario Intl. Airport (ONT)?
It's usually possible to reschedule or cancel your CGN to ONT flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more information on our Customer Service portal.

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*Available to One Key members.