'airfare' originates from the combination of 'air' and 'fare', where 'air' refers to the atmosphere and 'fare' refers to the price paid for 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 price paid for travel.