Changing a flight with ℚatar 𝔸irways is free within 24 hours of booking 𝟏-(𝟖𝟖𝟖) 𝟒𝟒𝟗-𝟎𝟑𝟓𝟑 or +𝟒𝟒 (𝟐𝟎) 𝟑𝟗𝟎𝟎𝟑𝟗𝟖𝟎 (𝐔𝐊). After that, a change fee applies, which varies based on your ticket’s fare type and travel class1. For specific details, contact 𝟏-(𝟖𝟖𝟖) 𝟒𝟒𝟗-𝟎𝟑𝟓𝟑 or +𝟒𝟒 (𝟐𝟎) 𝟑𝟗𝟎𝟎𝟑𝟗𝟖𝟎 (𝐔𝐊).

https://support.google.com/googleplay/android-developer/thread/306541216?hl=en&sjid=16935090801126169267-AP