Is Don Mueang Airport less busy than other Bangkok airports, and how much time should I allocate for immigration and security?

You can certainly do 2 hours, just make sure to check in online. 3 hours before is when the checkin counters open you can't really arrive earlier.

Let's not get carried away here. Most of us have better things to do than spend countless hours waiting at an airport for a flight.

Better arrive earlier rather than later but 90-120 minutes before your flight should do. 2 hours or 2.5 hours if it departs during a busy time of day.

If you're flying business class or with young children, are a monk or otherwise entitled to use fast track, then 90 minutes is absolutely sufficient.

Is one hour extra such a dilemma 🤦

Use business class, roll up 90 minutes before the flight and still relax in the lounge, job done.

I’m normally through immigration in 20 mins and off to gate

I was DMK sunday my only advice is to arrive

2h30 before your flight if you have international departure

1hour check in airasia

1 hours to check out visa and , sécurity check

30 minutes for chill and eat! And found departure gate!

Just book a fast track of your worried

it depends on the time of the day.

I have flown 7 times out of swampy airport this year all before 9 am and gone through (immigration & customs) in less than 30 minutes each time

There’s two airports in Bangkok. DMK and BKK. There may be “air parks” for private light aircraft but I’ve never checked.

For international flights it’s recommended 3 hours prior to flight. If you pass check in, immigration and security within 25 minutes (on a good day) you just have that much more time for shopping and or something to eat or drink or to relax. Last thing you want is a sprint to the gate as they’re closing it 40 minutes before takeoff.