U.S. --> Shanghai --> Delhi (visa required for a round-trip?)

Hello,

I'm curious to know if a visa would be required for the following itinerary for two U.S. citizens (with American passports):

Outbound = U.S. --> Shanghai (staying less than 144h) --> Delhi
Return = Delhi --> Shanghai (staying less than 144h) --> U.S.

I believe we wouldn't need a visa for the outbound portion, but I am unsure about the return portion, since we'll be traveling from India.

Guidance very much appreciated, thank you!