What route should a pilot fly if there's a two-way radio communications failure and no assigned route exists?

In the event of a two-way radio communications failure and no assigned route exists, the pilot should follow the last filed flight plan route. This practice aligns with established aviation rules and procedures that stipulate that if communication is lost, the pilot should proceed as planned unless updated or altered instructions are received from air traffic control.

Following the last filed flight plan ensures that the pilot continues the flight with a clear reference that was previously agreed upon with air traffic control. This helps maintain orderly traffic flow and minimizes the risk of conflicts with other aircraft. The planned route allows the pilot to navigate effectively while ensuring compliance with air traffic regulations.

While returning to the departure airport, flying directly to the destination, or maintaining the current route are options with varying levels of risk and uncertainty, the most structured and safe response is to adhere to the last filed flight plan. As such, it is the most reliable choice in a communications failure scenario, ensuring that the pilot can still navigate and make progress toward the intended destination under the guidance of a previously established flight path.