"I flew" and "I was fly" do not have the same meaning.

"I flew" is the past tense of the verb "fly" and means that the person traveled through the air using wings or an aircraft.

"I was fly" is not a correct sentence in English. If you are trying to say that you were flying in the past, you should say "I was flying."

So, no, "I flew" and "I was fly" do not mean the same thing.