'airfare' originates from the combination of 'air' and 'fare', where 'air' refers to the medium of travel and 'fare' refers to the cost of travel.

'fare' changed from the Old English word 'faru', meaning 'journey' or 'expedition', and eventually became the modern English word 'fare'.

Initially, 'fare' meant 'journey' or 'expedition', but over time it evolved to mean the cost associated with travel.