Jarle H Knudsen wrote:
Is it possible to visit Stonehenge by public transportation from London as
a one day excursion?

Yes.

Considering both convenience and price, what would you suggest?

We will most likely be traveling in May.

South West Trains from London Waterloo to Salisbury, then bus.

http://www.nationalrail.co.uk/statio.../nonrail/s.htm
http://www.wdbus.co.uk/htm/ta/sdo-stonehenge.asp
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Arthur Figgis Surrey, UK