Do you have LANpass kilometers and are LANpass elite?

If not - forget about upgrading.

Kilometer upgrades are only available to LANpass elite members. Upgrades from other frequent flyer programs than LANpass are not possible.

The one and only chance for a LANpass-nobody would be to pay the difference to a business class ticket.

My advice is to look out for LAN Premium cabin sales ex USA which pop up frequently and purchase a business class ticket ...