Go to PIA, ETIHAD, AIRARABIA & Qatar Airways office or website.
Here are 1 person's return ticket::::
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www.etihadairways.com [Qar.1230 via AbuDhabi - Return Ticket]
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www.airarabia.com [Qar.1178 via Sharjah- Return Ticket]
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www.qatarairways.com (Qar.1270 direct to Karachi)
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Remember, purchasing ticket online or from airline's office is always cheaper than taking it from an agent