Turkish Airlines “The Longest Day” 5X Miles Promotion For Travel September 1 – March 31, 2026

Turkish Airlines has begun teasing Miles&Smiles members about a new promotion called “The Longest Day,” which goes live for a few hours today (June 21, 2025).

Miles&Smiles members can earn 5X miles for a flight if they book using the Turkish Airlines app for travel between September 1, 2025, and March 31, 2026.

You can access this offer on the Turkish Airlines website here.

It is still unclear what the valid booking hours are today, but I will update this piece with them once we have the information.

Note that only ONE FLIGHT is eligible for 5X miles, and it is the first segment eligible under this promotion. 

Conclusion

Unfortunately, the 5X miles are only valid for ONE FLIGHT when a better option would have been the entire ticket.

This may work for you if the first segment is long, but not at all if it is just a short-haul hop.

Terms and conditions of this promotion:

1. The campaign is valid only for tickets to be issued via Turkish Airlines Mobile Application at the time period to be announced on the Miles&Smiles Official Instagram account.
2. Within the scope of the campaign, members will earn 5x Miles.
3. The campaign flight dates are between September 1, 2025 and March 31, 2026.
4. Changed tickets will be excluded from the campaign.
5. Each member can benefit from the campaign only once. Members who issue tickets for more than one flight will earn Miles from the first completed flight.
6. In order to benefit from the campaign, the flight must be registered to the Miles&Smiles account before the flight.
7. The earned Miles will be credited to the member’s account within 7 days following the flight.
8. Corporate tickets, group and special passenger segment (sailor, cruise, student/youth, health, etc.) tickets are excluded from the campaign.
9. Turkish Airlines reserves the right to change the campaign rules and conditions, definitions and other information, and to cancel the campaign.

Source