Citibank has a promotion currently operational, where a 20% bonus will be applied to converting your Citibank PremierMiles/ Citi Prestige points (for cards issued in India), to British Airways’ Avios.
For reference, Citi PremierMiles convert from 2 PremierMiles = 1 Avios currently, but with this promotion, you get 2 PremierMiles = 1.2 Avios. Similarly, for Citi Prestige points, they usually convert as 1 Citi Prestige Reward Point = 4 Avios, but with this promotion, you get 1 Prestige Point = 4.8 Avios.
Citi points usually transfer to BA within 48 hours, while the official timeline is 5 days. The bonus is usually posted along with the miles from the transfer. If you are planning a summer vacation, or any other trips using BA Avios redemptions, it may be a good idea to do the transfer and lock in tickets within a few days before there are redemption changes to BA’s program.