Taxi meter rate in bkk can get from Google. 😊
For me, I prefer airport taxi. The fare is pretty standard. Yes they do charge a little more (surcharge) compared to outside taxi, but their dispatchers can speak English. They can direct their taxi driver where to go. Most taxi drivers there speak very little English. Even if show them the full hotel address also, they may not able to read.
Before you book your taxi, do ask if the fare includes toll or not.
If you get taxi from outside airport, you may have to pay toll (expressway), maybe one or two tolls.
Do ask if they using meter or not (for taxi outside airport).
When you reach yr destination, the taxi driver will ask for tips. If the fare amount has been agreed earlier, no need to tip them ler. Unless they are friendly and helping you with heavy luggage.
During my previous trip, we paid 1300 baht to go from Suvarnabhumi airport to Soi 12 using airport limo van. 9 passengers with luggage. Very comfortable. Each seat has seat belt.
Now with Grab service, we actually looked up for the fare before deciding to take taxi or grab car. Very convenient.
Roughly can expect how much to pay. It's ok to pay a little extra but not double the actual fare. Some taxis don't use meters. Skip them or bargain with them. 😅
during peak hours...if you really have to take taxi...they won't bargain with you