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A taxi from Zvartnots to the city center should cost around 3000-4000 AMD (~6-8 euros). However, check the price before if you take the taxi! Many taxi drivers may not speak English.
Ggtaxi GG taxi ((https://wwwplay.ggtaxigoogle.com/signinstore/apps/details?id=am.ggtaxi.main&pcampaignid=web_share ) is a good option. It is the Uber/Lyft alternative in Armenia. You can download the App on your phone and register your card.
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