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The cheapest way to travel to Australia depends on where you are traveling from. The easiest and quickest way to travel would be by plane but a boat would also get your there.
WALK.
by plane
Cheapest and Quickest, is by train.
Yes, the cheapest way was to travel by water because by land you had to walk unlike in water which has currents. It does the walking for you.
Backpacking it, staying in hostels and using the slow trains for transportation makes for the cheapest travel around Europe.
bushow do i know ? i live there
Walk
The cheapest way to travel is using public transportation. You can take the train or you can take NJ Transit bus 190 that takes you straight into Port Authority.
Greyhound Bus.
Walk.
Airtran Airways is not always the cheapest way to travel. Though they often offer cheap deals, they do not travel to every airport or city. It also may be cheaper to drive if you are only traveling a short distance and you can drive.