Yes, Pilots Can Legally Fly Without A Radio In Parts Of US Airspace: Here’s Where

Pilots can legally fly an aircraft without an onboard radio in parts of the United States, provided the flight complies with applicable airspace, operating, and equipment requirements. Under visual flight rules (VFR), Class G airspace generally does not require routine two-way communication with air traffic control (ATC), and much of Class E airspace has no such requirement either. This allows appropriately equipped and operated aircraft to fly in certain areas without communicating with controllers. However, the rules change near busy airports, in designated controlled airspace, and during instrument flight. The legality of flying without a radio depends on where the aircraft operates, how the flight is conducted, and which other equipment regulations apply.