The cheapest times to fly from CRL to SEA are

  • July 30th to September 23rd (except the weeks of August 13th and September 10th)
  • October 8th to October 28th
  • November 19th to January 28th (except the weeks of December 10th, December 17th, and January 15th)

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 CRL to SEA is early August. Prices can be as high as $6741 for Sunday flights during early February, or as low as $3452 for Thursday flights around early August.


When to Fly to Seattle

Flying from Charleroi (CRL) to Seattle, WA (SEA) will usually cost between $3466 to $5912 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early August with an average ticket price of $3603. Due to high demand the most expensive time to fly is early February, with an average price of $4656. Planning your trip to low-cost times can easily save you $1053 on economy flights and even more on first-class flights. Generally, any price below $3837 can be considered a good price for a round-trip CRL to SEA flight.

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

CRL to SEA Flight Prices

Compared to other flights, the CRL to SEA flight is more expensive than the average and costs more than the average flight leaving from Brussels. The average price per mile (for a direct flight) is $0.48, which is a bit above average.


Flight Prices by Day of the Week

Thursday is usually the cheapest day to fly to SEA, and Wednesday the cheapest day to fly back into CRL. Sundays 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 $2320 (39%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Thursday and returning a week later will cost an average of $3654. Return trip prices are from the SEA to CRL 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 CRL to SEA can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 9 hour 55 minutes may not be realistic.


Flight Hacking CRL 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 CRL to SEA — but Champion Traveler does!

Hack #1: Copenhagen (CRL > CPH > SEA)

  • Price for both tickets: $573
  • Average savings: $3264 (85.06%)

See CRL to DUB flights

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

  • Price for both tickets: $646
  • Average savings: $3191 (83.16%)

See CRL to CPH flights

Hack #3: Manchester (CRL > MAN > SEA)

  • Price for both tickets: $728
  • Average savings: $3109 (81.04%)

See CRL to MAN flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 14 major airlines flying this route most often: Air Algerie, Air Canada, Air France, Alaska, Austrian, Belavia, British Airways, Delta, Finnair, KLM, LOT, Lufthansa, United, WestJet, and potentially more during busy seasons.

How far away is it from Seattle/Tacoma International Airport to Brussels South Airport?

The distance between the two airports is roughly 4968 miles or 7995 kilometers.

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

The real-world flight time for a nonstop CRL to SEA flight is about 9 hour 55 minutes.

How many flights go between Charleroi and Seattle, WA?

It depends on the day of the week and the date, but a typical day might have around 47 available flights from CRL to SEA.


Airport Location Info


Departing Airport

Origination code CRL
Origination airport name Brussels South Airport
City Charleroi
Country Belgium
Latitude 50.5
Longitude 4.5

Return Airport

Destination code SEA
Destination airport name Seattle/Tacoma International Airport
City Seattle, WA
Country the United States
Latitude 47.5
Longitude -122.3


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.