However, the rest of the cost of living rankings saw significant shifts due to exchange rate fluctuations.
Asian cities now account for half of the top 10 costliest destinations.
Hong Kong rose to second place and Singapore remained in fourth because of their expensive property and rental markets.
Shanghai, Beijing and Seoul also made the top 10.
Most expensive cities in 2015
1. Luanda, Angola 6. Shanghai, China
2. Hong Kong 7. Beijing, China
3. Zurich, Switzerland 8. Seoul, South Korea
4. Singapore 9. Bern, Switzerland
5. Geneva, Switzerland 10. N, Djamena, Chad
Chinese cities now account for nine of the top 30 most expensive cities because of the growing strength of the renminbi.
