The five Liberal Democrat MPs in Cornwall claimed about £62,000 for travel in the year 2005/2006.
The figures follow a two-year freedom of information battle with House of Commons authorities.
St Ives MP Andrew George topped the Cornish list at £17,000 and claimed for cycling expenses of 20p a mile, notching up £9.
Truro MP Matthew Taylor spent nearly £7,000 on car journeys, £4,000 on trains and more than £1,000 on flights.
South East Cornwall MP Colin Breed, claimed nearly £6,000 for train journeys and £5,000 on his car.
Falmouth and Camborne's Julia Goldsworthy claimed more than £11,000 and Dan Rogerson in north Cornwall more than £10,000.
The figures were published after a campaign by Lib Dem MP Norman Baker, who said the public ought to know how money was being spent.
Overall MPs spent about £2m on driving, £1.5m on trains and £1m on flights.