You can make your way to Phnom Penh by landing on the Phnom Penh International Airport which is located 7 km west of the city. Various Asian airlines fly to and from the city.
Most of the major airlines offer flights from Mumbai and/or Delhi with usually one stop in between, i.e. Bangkok.
The best way to reach Phnom Penh is by air. The airport in the city enables you to land directly on the outskirts of the city, from where you can take a bus or taxi to get in. You can also take flights from some prominent cities in Cambodia to save your time while taking trips to multiple cities in the country.
You can travel to Phnom Penh from nearby cities like Siem Reap, Battambang, Sisophon, etc. by bus. There are two bus stations in the city: one near the Central Market, and another near the Night Market.
Ferries can be taken from Siem Reap as well as Mekong Delta (Vietnam) to reach Phnom Penh.
The most popular way to get around the city is hiring a tuk-tuk or remork-moto. The other local transport options include pedicab (cyclo) and moto. If you're willing to explore the city streets on your own, you can hire a bicycle, motorbike or even a car- there are several places where you can get a vehicle on rent for varying charges. But before making your mind for this, ask yourself if you'd be able to cope up with the chaotic traffic in the city.
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