Macau is former Portuguese colony, nowadays one of two special regions of China. Macau is also known as "Chinese Las Vegas" due to the concentration of casinos and general tolerance of gambling. At this moment two airlines, either XIamen AIrlines or Air China, are offering some affordable solution from Europe. Round trip flights are starting at €348. Also the advantage could be that most of EU citizes may entere Macau without visa requirements.
If interested in solution with Xiamen Airlines you can look for travel dates between 23rd of April and beginning of June 2018. Max stay 1 month. Book by end of March. Consider to depart from cities such as Amsterdam, Luxembourg, Brussels, Dublin, Milan, Madrid, Geneva, Zurich, Budapest and Copenhagen.
Booking samples
Europe - Bali from €356
Amsterdam - Macau from €348
Luxembourg - Macau from €349
Dublin - Macau from €360
Milan - Macau from €371
Brussels - Macau from €372
Budapest - Macau from €375
Copenhagen - Macau from €375
Madrid - Macau from €381
Geneva / Zurich - Macau from €398
Travel samples
23.4. - 6.5.
23.4. - 8.5.
30.4. - 15.5.
7. - 20.5.
16. - 29.5.
19.5. - 2.6.
21.5. - 3.6.
26.5. - 10.6.
2. - 12.6.
Booking sample of cheap return flights from Europe to Macau from €348 here. In this case you would depart from Amsterdam to Macau on 30th of April. Your return flight back to Europe would be on Tuesday, 15th of May 2018.