I was at the airport last week (around 8pm), the usual (200 baht to anywhere in the city) airport taxis (limousine as they call it) with the shop/desk by the arrivals hall was closed! I thoroughly recommend you use grab or bolt app. and you will know the price before you agree to accept. Will certainly be less than 200 baht. As a last resort, there are usually 'private car taxis' or sometimes tuk tuks touting for business in the arrivals hall.