Booking a flight in the airport right before departure

I'll be making a trip through Thailand and I only have 18 days. I already booked a flight to Chiang Mai and a flight from Bangkok back home. I'm also going to book a flight from Bangkok to Ko Samui and back to Bangkok right before my flight back home. I haven't booked the flight to Ko Samui yet because I'm not sure how long I will stay in Chiang Mai and in Bangkok, so I don't know the date yet. I know there are a lot of flights between Bangkok and Ko Samui, so...

Is it possible and advised to just go to the airport in Bangkok and buy a ticket there to fly to Ko Samui already a few hours later (and the same for returning)? Or would you discourage to do this and advise me to just pick a date of departure and book this flight already?

Some advice?

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How many hours before departure can I book a flight?

You can book through call center up to 2 hours before flight departure for domestic sectors and up to 4 hours prior to flight departure for international sectors.

Is it possible to book a flight at the airport?

THE ANSWERYes, you can save money by buying an airline ticket at the airport. However, according to travel experts, this tip only applies to ultra-low-cost airlines that charge online booking fees.

Can you just show up at the airport and get a cheap flight?

Can you simply show up at the airport without a ticket and expect to get somewhere for cheap? The short answer is no. Airlines no longer allow you to wait around at the counter in hopes of snagging a "standby flight" and filling the last seat of a departing flight.

Can you buy same day flights?

Yes. For travelers making last minute plans, same-day tickets are generally available, depending upon availability. You can purchase a same day airline ticket either online (can be difficult sometimes), over the phone with the airline or travel agent, or at the airport.

FIRST INTERNATIONAL FLIGHT? : Travel Tip, Airport Walk, Flight Preparation | Jen Barangan

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Images: Ahmed Muntasir, Pixabay, Bibhash (knapsnack.life) Banerjee, Pixabay