International departure tax of US$25 is included in the ticket price at the point of purchase so there is no need for cash dollars when you leave the country.
Phnom Penh International Airport is the gateway to the Cambodian capital, while Siem Reap International Airport serves visitors to the temples of Angkor. Both airports have a good range of services, including restaurants, bars, shops and ATMs. Sihanoukville International Airport currently offers very limited international connections to a handful of neighbouring countries. Note that e-visas are not accepted at Sihanoukville's airport.
Flights to Cambodia are expanding, but most connect only as far as regional capitals. Cambodia Angkor Airways (www.cambodiaangkorair.com) is the national airline and offers the most international flight connections to destinations around the region, including Bangkok, Danang, Guangzhou, Ho Chi Minh City, Seoul and Shanghai. Thai Airways (www.thaiair.com) and Bangkok Airways (www.bangkokair.com) offer the most daily international flights connections, all via Bangkok. Vietnam Airlines (www.vietnamairlines.com) has several useful connections, including from both Phnom Penh and Siem Reap to both Hanoi and Ho Chi Minh City, as well from Phnom Penh to Vientiane and Siem Reap to Luang Prabang, Danang and Phu Quoc.
Budget airlines have taken off in recent years and are steadily driving down prices. Useful budget airlines include Air Asia (www.airasia.com), with daily flights connecting Phnom Penh and Siem Reap to Kuala Lumpur and Bangkok; Jetstar (www.jetstar.com), with daily flights from both Phnom Penh and Siem Reap to Singapore; and Cebu Pacific (www.cebupacificair.com), with three or four weekly flights from Siem Reap to Manila.
Other regional centres with direct flights to Cambodia include Pakse, Hong Kong and Taipei. Longer-haul flights are currently limited to Doha and Tokyo.