Yes, there are multiple flights from Bangkok Intl to Papua New Guinea for under ฿ 69,042. The cheapest flight booked recently is on Multiple Airlines for just ฿ 68,082, but on average you can expect to pay ฿ 81,590.
Airlines globally have implemented additional safety measures to accommodate you. Philippine Airlines is one of them. Some of the new policies that have been implemented to accommodate travellers flying from Bangkok Suvarnabhumi to Papua New Guinea are improved sanitation, HEPA filters, mask requirements, socially-distanced seating (for a limited time), and pre-flight testing for antibodies and symptoms. Policies will vary by airline.
Due to the rapidly changing circumstances due to COVID-19, airlines like Philippine Airlines flying from Bangkok Suvarnabhumi to Papua New Guinea have implemented new flexible change policies.
There are no direct flights from Bangkok Intl to Papua New Guinea, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
There are currently 3+ open flights from Bangkok Intl to Papua New Guinea within the next 7 days for less than ฿ 84,051.