Infinity Girls Hwangbo, Song Eun Ee, Shin Bong Sun, Kim Shin Yeong, Jeong Shi Ah and Park Bo Ram are said to be filming in the Philippines this May 16th to 19th.
It's in an island called Cebu!! (thanks cati!!) I googled an airport in Cebu and there's only one, it's called Mactan International Airport. On the website the arrivals for May 16th are these two flights:
I believe there are some that are planning to greet them at the airport! For more info check these two links: