Odds for a flush

[papa_georgio]

If i've been dealt two suited cards, and then two more of my suit come on the flop, what are the odds of completing my flush? I'm only asking because I've been told that it's something like 1.86 to 1 that it will come by the river, but it sure doesn't seem to hit that often. Any replys, or links to accurate odds charts are very appreciated.