There are two boxing stadiums in Patong Beach area.

Bangla Boxing Stadium

The Bangla Boxing Stadium (BBS) is located on Bangala Road and can be easily accessible to anyone walking by. It is located behind the Jungceylon Mall, directly opposite the Banzaan Fresh Market. From the outside it does look kinda touristy with a large bar and pole-dancing girls just next to the ticketing counter (part of the Tiger entertainment complex).

They hold fights three nights a week, on Wednesday, Friday & Sunday nights. There are three types of ticketing at the BBS. VIP seats - 2500 bhts, Ringside seats - 2,000 bhts and Stadium seats - 1,700 bhts. The fights commence at 9pm and run until 11:30pm.  They usually have about nine fights on the card, either Thai vs Thai, Thai vs European or European vs European fighters. The fights are real and not staged.

The VIP seats are at ground level and immediately adjacent to the ring, which means you have to look up and have the added risk of getting splattered with sweat or blood. The ringside seats are set back and located in tiers underneath the stadium seats. The stadium seats are on the second floor level looking directly down at the ring. If you don't not have a reserved VIP seat you should try and get there early (about 8:30pm) and get a front row ringside or stadium seat, in order to have a clear unobstructed view of what is going on in the ring.

Before and during the fights they have staff which will take drink orders for people in the VIP seats and ringside seats. Also the local bookies will wander around the ground taking bets on the fights if you want.  

Their website is http://www.banglaboxingstadiumpatong....

Patong Boxing Stadium

The Patong Boxing Stadium is at Sainamyen Road.  It  is located at the Bungy Jump site and Bowling Alley, which is more difficult to access to if you do not have transportation means as it is quite far in from the main street. This one looks more like catering to the local crowd and it even has a training gym and ring for the boxers.

They have fights two nights a week, Monday and Thursday nights. The price here is slightly cheaper than the Bangla Boxing Stadium, with Ringside seats - 1,500 bhts and Stadium seats - 1,300bhts. The fights commence at 9pm and run until 11:30pm.

Their website is http://www.boxingstadiumpatong.com/