Is there any website or data-sheet that I can find drag of airplane for cruise conditions. $C_D$ vs $C_L$ graph is also acceptable.
To be more specific I am searching drag values of A320 in cruise flight.
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I need to make a few assumptions to close the gaps in the data you provide.
Now the drag force is 1/18 of the weight force. Weight is mass times gravitational acceleration: 745,300 N. So drag would be 41,406 N at this point.
At the end of the trip the aircraft has burnt through 15 tons of fuel; now the drag is a mere 34,300 N.