Uwe Schwertfeger wrote:

Hi there!

Maybe a silly question, but how "severe" is the booking situation for
flights during the Xmas days in North America normally? I mean when at
the latest do you have to make up your mind to do the booking in order
to get a seat for sure?

The leg in question would be a round trip from Vancouver Island/Canada
to Chicago/USA between Dec 19 and Jan 2. When would you do

I would start looking now. That is one of the busiest air travel times of
the year. Schools are closed from before Christmas until after New Years.
There will be a l lot of college and university students heading home for
the holidays, and a lot of families head south for a few weeks of sunshine.