Citi Thankyou Rewards program just launched its latest transfer bonus promotion where you can transfer points to the Flying Blue program with a 25% bonus.
Transfer Thankyou Points To Flying Blue With A 25% Bonus

Through June 17, 2023, members who hold Citibank credit cards issued from the United States will receive a 25% bonus when transferring the Thankyou points to Flying Blue Miles. There is no limit on how many points you can transfer to the miles therefore it is a great opportunity if you plan to redeem miles on Air France or KLM.
Moreover, currently, the Flying Blue program released Promo Rewards for May 2023. Therefore, you can book an award flight for much less than the regular rates.
How Long Does It Take For Citi Thankyou Points To Transfer To Flying Blue Program
Citi Thankyou points can be transferred to the Flying Blue program instantly most of the time. However, rarely do the points take a few hours to be transferred.
Citi Thankyou Points Transfer Ratio To Flying Blue Program
The Thankyou points can be transferred at a 1000:1000 ratio to most airline mileage programs including the Flying Blue. You can transfer up to 500,000 points per transfer to an airline.
Should You Transfer Thankyou Points To Flying Blue Program
All major bank reward programs partner with Flying Blue and sometimes they offer better deals. Therefore, it is best to transfer points when you have specific travel plans in mind rather than keeping your miles just because there is a bonus offer.

Summary
Through June 17, 2023, the Citi Thankyou reward is offering a 25% bonus on points transferred to the Flying Blue program. Kee pin mind that this promotion is offered to those who have a US-issued Citibank credit card.
While redeeming Flying Blue miles on Air France and KLM is not the best as the program has dynamic award prices, in some cases, it is worth booking the flights with the Flying Blue program as it offers more award seat availabilities – including the amazing La Première.