Question : In the next four weeks, what day should you book your trip?
Answer : Since low prices are preferred, look at Mar 1st. As of Feb 20th, it's showing the cheapest ticket sales at $1,102. That is 74% below the average price for this route, so you can spend that extra money on an adventure rather than the flight.
Question : What price range should you expect when booking from Phoenix (PHX) to Siem Reap (REP)?
Answer : Flight prices are fluctuating much more for this route than the majority of routes from the United States, as they're ranging anywhere from $842 to $7,773. However, the sooner you book, the better price you tend to get.
Question : How long do most people visit Siem Reap?
Answer : Of course you're not most people, but if you were, you'd stay roughly 10 days.
Question : If your plans are flexible, have you considered changing your departure day?
Answer : The best day to fly on a budget this month is Wednesday. Flexibility is paramount when booking travel plans in order to keep travel costs down.