Date of departure: Dates of flights departures vary according to destination. See details below. Do not forget! Luggage, food, seat reservation and entertainment on board might not be included in the cost with some low cost airlines (Scoot).
Accomodation
For booking cheaper accommodation in advance we recommend the followings
Port Moresby (POM, Papua New Guinea) - Hat Yai (HDY, Thailand) Travel date: May 12, 2019 May 25, 2019 (12 nights) Price: A$882 ($626/£485) Distance: 5503.74km Travel duration: 25:15 and 20:45 (there and back) Hand luggage (weight and size): 38x54x20cm 7kg Checked-in Baggage: Not included in the cost.
Airlines: 
4* Philippine Airlines
Scoot (These flights are with low-cost airline.)
Flights booking examples
Here is an example of the cheapest flight with Philippine Airlines/Scoot (you can try Philippine Airlines/Scoot promo codes) from Port Moresby to Hat Yai at a price of A$882. In this case is departure flight from Port Moresby on May 12, 2019 to Hat Yai. The return way is from Port Moresby to Hat Yai on May 25, 2019.