British Airways are offering a free, one-way upgrade to First when their customers are booked on an eligible return flight in Business Class.  

The free upgrade to First is available one-way on either the outbound or the inbound part of the journey. Passengers eligible are those booked on selected qualifying Club World British Airways flights from the UK. Upgrades are subject to availability on selected flights (restrictions apply). 

The offer is now available on all services between the UK and USA, Canada and Mexico.

Upgrade is valid on BA flights that operate with a First cabin.