Do you go through C&I if you are flying AMS-WAW? I thought I do that in AMS since both are Schengen ... although I've never done intra-Schengen flights, only trains.

I do have 1 Euro coins and will be able to get more Euros during my stop in AMS (since I need them for AMS anyway) so I'll make sure to keep some for the bus.

The 175 shouldn't take too long as the Warsaw Transit site says it takes about 25 minutes to get to Central station, although I don't see how it can do 20 stops in that time.

If not, the 12 Zloty ticket seems like the best idea since it's less than $4 and would just cover everything.

You're lucky, the Marriott is right next to the Central station ... unfortunately, I'm more of an SPG guy, so I booked the Westin, albeit at a great rate. The weather looks good this weekend though, so I should be fine.

Edit: Here is a better schedule for the Hotel bus : http://www.warsawairporttransfer.pl/...-schedule.html

It looks like it shows a continuous timing for Airport -> Centrum and back. The ride from the airport is longer than the ride to the airport because of less stops (40 minutes Airport>Centrum, 31 minutes to airport).

Is 1h:10m before departure enough time to check in at WAW for the return flight?