The itinerary lasts 4days 5hrs 06min, and has 12 steps, and it will cost 194 euros minimum.

Paris - Berlin
Take the train from Paris Gare de l'Est at 7:12pm, arriving at Berlin Central Station at 9:16am the following morning.
The step from Paris to Berlin lasts 13hrs 15min. You'll travel in a Nightjet operated by ÖBB.
On board, you'll have access to: Drinks and snacks.
You can find tickets from 64.9 euros.

Berlin - Warsaw
The step from Berlin to Warsaw lasts 6hrs 00min. You'll travel in a high speed train.

Warsaw - Vilnius
The step from Warsaw to Vilnius lasts 7hrs 58min. You'll travel in a night bus.
You can find tickets from 20 euros.

Vilnius - Tallinn
The step from Vilnius to Tallinn lasts 8hrs 00min. You'll travel in a night bus.
You can find tickets from 20 euros.

Tallinn - Helsinki
On the Tallink website, you can get a 15-20% discount on your Interrail pass!
The step from Tallinn to Helsinki lasts 2hrs 00min. You'll travel in a ferry.
You can find tickets from 29 euros.

Helsinki - Rovaniemi
The step from Helsinki to Rovaniemi lasts 11hrs 34min. You'll travel in a night train.
You can find tickets from 7 euros.

Rovaniemi - Helsinki
The step from Rovaniemi to Helsinki lasts 13hrs 00min. You'll travel in a night train.
You can find tickets from 7 euros.

Helsinki - Stockholm
With your Interrail pass, you can get a 15-20% discount on the Viking Line website!
The step from Helsinki to Stockholm lasts 18hrs 00min. You'll travel in a ferry.
You can find tickets from 38 euros.

Stockholm - Copenhagen
The step from Stockholm to Copenhagen lasts 8hrs 59min. You'll travel in a night train.
You can find tickets from 9 euros.

Copenhagen - Hambourg
The step from Copenhagen to Hambourg lasts 5hrs 00min. You'll travel in a high speed train.

Hambourg - Cologne
The step from Hambourg to Cologne lasts 4hrs 00min. You'll travel in a high speed train.

Cologne - Paris
The step from Cologne to Paris lasts 3hrs 20min. You'll travel in a high speed train.