Unless otherwise noted, movies are playing at most multiplex cinema chains. For showtimes, call the cinemas or check their websites.

Seat prices in Bangkok cinemas are usually around 140 baht and range from 80 baht to 1,000 baht (or more, for seats in luxury "Gold Class", "Blue Ribbon" or "First Class" cinemas). Major Cineplex and SF Cinema branches have special low prices on Wednesdays, but there are many restrictions.

The King’s Anthem is played before the main program. You must stand as a sign of respect.

Here are the contact details for Bangkok cinemas:

Apex Siam Square (Lido and Scala)
Rama 1 Road
BTS: Siam
Lido: +6622526498
Scala: +6622512861

Century – The Movie Plaza
BTS: Victory Monument

Embassy Diplomat Screens
6th floor, Central Embassy
BTS: Ploenchit

3rd floor, RCA Plaza (above Tops Supermarket)
MRT: Phetchaburi, exit 1, then taxi to RCA
Facebook page

Krungsri IMAX, Paragon Cineplex (BTS: Siam)
IMAX Digital, Major Cineplex Ratchayothin
MRT: Phaholyothin, exit 3, then taxi
IMAX Digital, Major Cineplex Pinklao
554-544/1 Borom Rachachonnanee Road,
Bang Bamru, Bang Phlat Bangkok 10700
River Express to Phra Pin Klao Bridge and then taxi

Major Cineplex (includes EGV, Esplanade, IMAX, Mega, Paradise, Paragon)
Bangkok: +6625155555

Major Hollywood
Bangkok: +6627187999

Paragon Cineplex
BTS: Siam
Siam Paragon: +6621294635

SF Cinema City, SFX Cinema, SF World Cinema
Bangkok: +6622688888

There's also a list of Bangkok cinemas on Foursquare.