The answer to your question as well as to the general question of who is
responsible for closing any flight plan is: The pilot-in-command

Though generally speaking when you land at a towered airport they usually
close your IFR flight plan for you,,, but it is more a courtesy rather than
something they are 'responsible' for,,, so-to-speak. In the end it is the
responsibility of the PIC

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Good Flights!

Cecil
PP-ASEL
Student-IASEL

Check out my personal flying adventures from my first flight to the
checkride AND the continuing adventures beyond!
Complete with pictures and text at: www.bayareapilot.com

"I fly because it releases my mind from the tyranny of petty things."
- Antoine de Saint-Exupery -

"We who fly, do so for the love of flying. We are alive in the air with
this miracle that lies in our hands and beneath our feet"
- Cecil Day Lewis -