If you're using automatic fulfillment, the countries available for shipping depends on the print lab you have chosen.
WHCC
USA, Canada, and International
ProDPI
USA, Canada, and International
Millers
USA
Mpix
USA
Loxley Colour
UK, Republic of Ireland, Austria, Belgium, Bulgaria, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Italy, Latvia, Lithuania, Luxemburg, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Bosnia, Iceland, Norway, Serbia, Switzerland, United States, Canada
Atkins Pro
Australia, New Zealand, and International
You can also review the Shipping Methods available for each lab by going to the Store > Shipping > Automatic Fulfillment, and selecting the desired lab to see what they offer: