In November I've stayed at Miracle hotel by BKK airport. Rooftop pool provides nice view of the entire field. I had only 300mm lens but managed to get some nice stuff. For $30 a night you get big clean room and a breakfast.
Rooftop is open 7am to 8pm, but in the morning you can ask at the reception and they'll be happy to open it for you.
Here some of my catches.
![Image](https://live.staticflickr.com/65535/52580566062_7d4421ee6f_b.jpg)
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Entire set: https://flic.kr/s/aHBqjAkjcA