At uncontrolled fields, it's your responsibility to close the flight plan.
If my first radio contact is with ATC or FISO at the departure airport, he will find the plan because you will say something like "XXX Tower G-ABCD, Cessna 172 on apron,
VFR flight plan to Lelystad, request departure information".
If the first contact is XXX Information (provided you took off from an uncontrolled airfield) you will say "XXX Information G-ABCD, Cessna 172
on VFR flight plan to Lelystad, just departed ZZZ, departure time 45". This allows him to activate the plan by filling the departure time.
If the destination is controlled field, they will close your plan.
If uncontrolled, I am used to close the plan on short final like this "XXX Information, G-ABCD short final runway 24, please close my flightplan." You talked to him all the time, he knows who you are and where you are. The response will be "G-ABCD flightplan closed, landing time 55".
Works for me every time.