Due to multiple factors, expect to potentially pay more when booking in December. For low rates, April can be a great choice for travel to Cologne. Flights to Cologne from Sacramento in April are about $986 on average during April, but can be found for as low as $560.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Sacramento to Cologne as you normally would.
On average you can expect to pay $671 for a flight from Sacramento to Cologne. The cheapest flight overall is $671 while the most popular route, (Sacramento Intl - Cologne Köln/Bonn) is currently priced at $649.