Can I earn cards for flights I took in the past?

Yes, this is possible!

In principle, boarding passes can be added for flights that fulfill two conditions. Firstly, the flight must have taken place after registration with Uptrip. Secondly, the flight must not have taken place more than six months ago.

Irrespective of this, new users can add up to two boarding passes from flights that took place before registration. These must also not be older than six months.