If you intend to use the Cronos web portal for filing a flight plan (V/Z/Y), you need to apply for a user account in the system by filling out the registration form at the link below:
C-preflight-information
Flight plan
Operators create flight plan in accordance with AIP Iceland ENr 1.10 and submit it to air navigation services before their flight.
Flight plans can be submitted via phone:+354 424 4242
IFR flight plans
Detailed information on flight plans can be found in section ENR 1.10 of the AIP Iceland.