Any idea on the fast train from Helsinki to St Petersburg?
After some more research, it looks to me that the fast train option from Helsinki is more appealing if we modify our itinerary to Stockholm - Tallinn - Helsinki and then either train Helsinki to St. Pete, or plain HEL to LED. I can get an American Airline award at 10K and $30 taxes to fly the nonstop AY flight HEL-LED, or the $150 per person one-way fast train.