I'm planning to book some flights on Bangkok Airways from BKK to Luang Prabang in November. Their website currently shows the schedules to the end of October but it's possible to check beyond that by starting to make a booking. When I checked the prices in November, I noticed that they're about 25% more expensive than the current online web-only rates. The disadvantage is that the rates are only valid in September and October for travel during those months.

Does anyone know how far in advance Bangkok Airways makes their web-only rates available? Is it worth me taking the risk of waiting until November or should I just go ahead and make the booking now to get the flights I want?

Thanks!