i am lost

Thank you both for your advice.

Hello, I am undergraduate student -- I hope it's not an issue for me to post on the forum. Recently, I was awarded $2000+ through two grants to complete a research project. In my proposal, my plane ticket constituted most of the budget (more than 80%). I am still progressing toward completing the project, but I believe I can complete project without flying abroad to complete fieldwork. Can the institutions that offered the grants confirm that I did or did not fly internationally? Is it unethical to complete the project and retain the funds -- despite not traveling abroad, as described in the grant proposal?