Honka made his IIHF international debut for Finland in April 2018 at the 2018 IIHF World U18 Championships in Chelyabinsk and Magnitogorsk, Russia where he was able to play with other Finnish top talents including 2018 NHL Entry Draft third-overall selection Jesperi Kotkaniemi and fellow 2019 NHL Entry Draft selections Kaapo Kakko, Lassi Thomson, and Mikko Kokkonen. Honka collected five points in seven games to help the team secure gold over the United States.