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Fiesta was made by Homer Laughlin Co. (HLC) who also made other lines similar to Fiesta. The round handle tells the story. No Fiesta or any of the others have handles like yours, nor did HLC produce any cups in light blue.(source, "Fiesta" Sixth Edtn, Gene Florence).
As for your cup, without any marks, it's difficult to identify. There are millions of single cups in thrift stores for 25 cents. I look at the cups and have occasionally found old cups mixed in with the hordes! If you're in this game to make money learn the patterns, colors, styles,. etc.
Thank you very much for your comment. I do however research quite a bit before I post here and I'm learning as I go along.