If they have Pakistani Passport then no. But here in UK a lot of AHMADIES go and perform Hajj every year. You see they are called Non Muslims in Pakistan only.
P.S - I dont know about Qadianies....I think becasue they live in India they would be going as well becasue even in India Ahmadies are called Muslims.
addition
A lot of Ahmadies out African Brothers and Sisters also visit Mecca to perform Hajja and Umra...and same thing in far east.
Well frankly I have never come across any Ahmadi in recent years. Although when I was around 16 years one gentleman in Lucknow handed over a paper bill to me about Ahmadiyaat and told me that we are being persecuted and being declare non muslims in Pakistan.
Later just some months back when I talked to my father about Ahmadis, he told me name of an Ahmadi in our hometown, and I was surprised to know that he was quiet an influential personality of our muslim dominated town.
What I understand from ur reply is that if the prospective haji doesnt declare his Ahmadi credentials than he can go to Haj, and this is not possible in Pakistan, therefore no Ahmadi Haji in Pakistan.
Thanks.