Find out what your airline's broken bone policies are. If you are planning to fly, contact the airline to see what their regulations are for passengers with broken bones. Some airlines require you to wait at least 48 hours after receiving your cast in case you experience any swelling in your arm.
Pack lightly. Whether you are driving or flying, pack as few personal items as possible. This will make moving around, boarding and de-boarding as quick and painless as possible. Calculate exactly what you will need for your trip and figure out what bulky items you can purchase at your destination, rather than bringing them from home.
Use convenient baggage. If flying, use a small suitcase or bag with wheels. You will be able to pull this easily through the airport without added pressure to your arm or shoulders. Avoid using a backpack or bulky bag that requires you to use your broken arm. For a bus trip or car ride, use a small tote bag with large straps that you can access easily from a sitting position.
Ask for help. If you choose to travel using public transportation, contact the bus station or airline before your trip to arrange for help. You can also ask for assistance at the ticket counter. Airlines will be able to arrange for you to take a cart through the airport to your gate. This will prevent you from walking long distances. Someone will also be able to help you board the plane and stow your carry-on baggage. When traveling by bus, the bus driver will be able to assist you in getting a handicap-accessible seat that will allow you room to sit comfortably with your cast.
Wear a sling while you travel. Most arm casts are very heavy. Wear a sling while you travel to give your shoulders and back relief from holding the weight of your cast. You can get a sling from your doctor's office or in the First Aid section of most stores.