yes, but UTP in Flex is more expensive than S in GoLight. If you use ITA Matrix and you add booking class S manually in the advanced options you, if available, you can book the ticket on Expedia using Powertools
(if youre not familiar with ITA Matrix and Powertools check this post:
ITA-Matrix-PowerTools - Userscript for Orbitz/DL/UA/AA/BA/CZ/IB/LA/LH/LX/TK)