Upvote:2
Cheers from Kaliningrad. There should be no problems with that as long as you take a flight.
Train, Bus or Car trip is a completely different story, though.
Upvote:2
I completely changed my itinerary, and I had no problem (Swiss passport here). Nobody ask me the reason of the change.
Just keep the new itinerary dates within the expected dates, and do not change the purpose.