"Looks a fairly good price but was this price for a series on one way tickets or a multi centre flight booking on a single ticket or some other permutation of tickets?"
it is the results of a search on Kayak.com on the Multi-City tab, three seperate single journeys all on Delta. I hope that answers your question...
"6 months is quite a short time to cover all of South and Central America. It's possible, but you will be rushed."
I see what you mean, but to be honest I want to spend a lot of my time in Peru, Bolivia and Colombia and as you said it is doable... I would like to travel for longer but as a tourist am I only aloud in South America for 3 months or does it depend on the countries rules. Otherwise I would spend 6 months in South America, then 3 months in Central America and the a couple of months in USA (California). I thought I would have to book return flights to London and flights out of South America as proof I'm not breaking any rules without a visa.
Now I know this is long winded to read but here is a rough itinerary I've put together and will be improving but mainly I'm trying to work out the route and transport I'll take. Towards the end plans get looser as I haven't researched much.
FLY FROM LONDON
START IN VENEZUALA, CARACAS
Overland Caracas > BRAZIL, Salvador
From Ciudad Bolivar (do Angel Falls tour), go to Santa Elena de Uairen, then to Boa Vista, then to Manaus, then to Belem (by boat) then down the Brazilian coast you go by bus (Fortaleza, etc) until you get to Salvador. This includes Venezuelan Gran Sabana part (the tepuys, Roraima trek, etc) and the boating through the Amazon.
Buses from Salvador > Brasilia > Rio > Sao Paulo > Florianapolis
Buses from Florianapolis > URAGUAY, Punte Del Este > Montevideo > Colonia Del Sacaramento
Boat from Colonia Del Sacramento > ARGENTINA, Buenos Aires.
ARGENTINA AND CHILE (needs more planning)
Overland from Buenos Aires > Iguaza Falls (see Brazil side too) > CHILE, Valparaiso > Santiago > ARGENTINA, Mendoza, Cafayate, Salta , San Pedro de Atacama > THE DEATH TRAIN???? BOLIVIA, La Paz
Overland from La Paz > Uyuni THE VILLAZON TRAIN??? > Potosi > Sucre > Copacabana (Isla Del Sol) > Puno (Urus Islands) >
From Puno, by tourist bus to PERU, Cuzco (Lake Titicaca)
Train to Aguas Calientes and trek to Machu Picchu along Inka Trail or do a different trail as there are others (return on train)> Colca Canyon > Arequipa > Nazca > Lima
Overland from Lima > EQUADOR, Cuenca
Overland from Cuenca > Amazon > Galapaagos Islands > Quito
Overland from Quito to COLOMBIA, Popayan > Cali (Take a "chicken" bus from Quito to Tulcan, take a taxi to the border (la frontera). Take a taxi to the Ipialas Bus station. Take the Ipialas bus to Cali (To break up the long trip, stop in Popoyan.)
Overland from Cali > Bogota (Plan it with a stop in Armenia, cross the Quindio Pass (La Linea) in the day > Medellin (day trips from here to lots of places) - > Cartegena
PANAMA-Panama City > Bocas Del Torro >
COSTA RICA-Manuel Antonio
GUATAMALA-Guatemala City (Stay in Antigua) > Mexico City.
Fly from Mexico City to California-San Francisco-Los Angeles-San Diego-Arizona. FLY FROM ARIZONA to LONDON
Please tell me what you think of this so far and how long in total you think I would need, and how I'd go about doing it in a year without visas considering I am a tourist and don't plan on working for money.
Thanks again for all the help so far and sorry for the longest reply ever,