Originally Posted by
KLL1972
There are no reward seats available in club hence my question, can I pay to upgrade even though original booking was a reward booking.
Yes, you may be able to upgrade with cash although the upgrade offer may only be to world traveler plus. As noted by others above, you may be offered a proactive online upgrade (POUG) to world traveler plus or at the airport you can ask about an airport upgrade (AUP) to WTP or CW.
More information about POUGs here:
Pro-active Online Upgrade (POUG) tracking and discussion | 2020 thread
More information about AUPs here:
Airport Upgrades (AUP) promotion 2020 thread
Both of these threads can also be found in the forum dashboard at the top of the page.