It is highly recommended to rent a car to travel around Bradbury conveniently. The estimated cost for car rentals varies from $50-$100 per day, depending on the type of vehicle. It is also advised to keep Google Maps or another map app handy to avoid getting lost. Total estimated travel time is around 30-40 minutes from downtown Los Angeles.
If you have more time, you can visit the Citrus State Historic Park or the California Citrus State Historic Park. They're both worthy additions to your itinerary. If you have less time, you can skip the hiking activity or the visit to the botanical garden.
The nearest airport to Bradbury, California, is the Ontario International Airport (ONT). It's about a 30-minute drive from Bradbury, and the airport code is ONT. The airport offers various options for ground transportation such as taxis, shuttles, ride-shares, buses, and car rentals.