The cheapest times to fly from CGN to SEA are

  • January 8th to March 25th
  • April 9th to June 3rd
  • October 22nd to December 9th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from CGN to SEA is mid May. Prices can be as high as $1364 for Saturday flights during mid August, or as low as $799 for Tuesday flights around mid May.


When to Fly to Seattle

Flying from Cologne (CGN) to Seattle, WA (SEA) will usually cost between $829 to $1281 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid May with an average ticket price of $836. Due to high demand the most expensive time to fly is mid August, with an average price of $1307. Planning your trip to low-cost times can easily save you $471 on economy flights and even more on first-class flights. Generally, any price below $964 can be considered a good price for a round-trip CGN to SEA flight.

See below for a graph of average weekly prices for the CGN to SEA route. All prices are for round-trip tickets in USD.

CGN to SEA Flight Prices

Compared to other flights, the CGN to SEA flight is priced close to the average and costs slightly more than the average flight leaving from Cologne. The average price per mile (for a direct flight) is $0.12, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to fly to SEA, and Thursday the cheapest day to fly back into CGN. Saturdays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $86 (6%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $955. Return trip prices are from the SEA to CGN flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from CGN to SEA can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 9 hour 60 minutes may not be realistic.


Flight Hacking CGN to SEA

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from CGN to SEA — but Champion Traveler does!

Hack #1: London (CGN > LHR > SEA)

  • Price for both tickets: $590
  • Average savings: $374 (38.8%)

See CGN to DUB flights

Hack #2: Dublin (CGN > DUB > SEA)

  • Price for both tickets: $615
  • Average savings: $350 (36.26%)

See CGN to LHR flights

Hack #3: Berlin (CGN > TXL > SEA)

  • Price for both tickets: $627
  • Average savings: $337 (34.96%)

See CGN to TXL flights


Flight Questions Answered

Still have questions about flying from CGN to SEA? We’ve got answers.

Which airlines fly this route?

You can find 14 major airlines flying this route most often: Air Canada, Air France, Air New Zealand, Alaska, Alitalia, Austrian, British Airways, Eurowings, KLM, Lufthansa, SWISS, Tap Air Portugal, Turkish Airlines, United, and potentially more during busy seasons.

How far away is it from Seattle/Tacoma International Airport to Koeln Bonn Airport?

The distance between the two airports is roughly 5010 miles or 8063 kilometers.

How long does it take to fly from CGN to SEA?

The real-world flight time for a nonstop CGN to SEA flight is about 9 hour 60 minutes.

How many flights go between Cologne and Seattle, WA?

It depends on the day of the week and the date, but a typical day might have around 55 available flights from CGN to SEA.


Airport Location Info


Departing Airport

Origination codeCGN
Origination airport nameKoeln Bonn Airport

Return Airport

Destination codeSEA
Destination airport nameSeattle/Tacoma International Airport
CitySeattle, WA
Countrythe United States


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.