Reaching Bien Hoa is easy. You can take a flight to Tan Son Nhat International Airport in Ho Chi Minh City (Saigon), which is the largest airport in Vietnam. You can then hire a taxi from the airport or have prior arrangements made from the tour operator for it. It will take you an hour to reach Bien Hoa from Ho Chi Minh City by taxi.
You can also reach Bien Hoa from Ho Chi Minh City from bus within an hour and a half or a maximum of three hours depending on the traffic situation or road obstructions.