In this case, Google (or whatever search engine you prefer) is your friend. I put in "odds of making a straight in texas holdem" and got plenty of links to figure these out.
Odds of flopping a flush is 118:1 or about 0.8% and odds of flopping a straight can be a bit higher (but not by so much).
Flopping the flush or the straight on a flop doesn't happen all that much. But by the river you feel like it happens all the time online. Defiantly feels like it beats you more than you win with these hands.
Let's play poker:icon_rr: