Yes regular UPS express service will work. However, you will need to have a UPS account in order to be able to generate a international returns label. Everything is free but you will have to do that additional step of creating an account and adding a credit card to that account.
This can also be done at a UPS store. However, since UPS stores are franchises, they donot want to get involved with International returns and will ask you to do it online.
Thanks! This is really helpful.