The best price found from United States to Myanmar (Burma) is on September 19th, 2015, travelling with Singapore Airlines. See more options, compare prices and book: search flights.
International flights arrive at Yangon (Rangoon; RGN; www.ygnia.com), Mandalay (MDL; www.mandalayairport.com) and Nay Pyi Taw (NPT; www.nptia.com) airports. The most common route to Yangon is via Bangkok, though there are regular direct flights with several other regional cities including Singapore and Kuala Lumpur.
Airlines offer discounted tickets via the internet depending on how far in advance you book. Good deals are often available from Bangkok, Kuala Lumpur and Singapore on budget airlines such as AirAsia and Silk Air. If you're flying around the region, look into Bangkok Airways Discovery Airpass (www.bangkokair.com).
In Myanmar you can buy international tickets from travel agents or online.
Myanmar locals pay K500, but foreigners pay $10 departure tax, which is not included with your air ticket. Have the US dollars in hand when leaving the country. You pay at the window in the entrance hall, before you check in. Kyat are not accepted. There is no departure tax for domestic flights.
It's important to reconfirm your outgoing tickets from Myanmar a few days in advance for all airlines other than Thai Airways and Silk Air. If you've forgotten what time your flight is, the inside back page of the Myanmar Times lists the week's international flight schedule.