As a Bangkok resident, if I need to fly to a nearby country outside Thailand, I will likely do so from Don Mueng airport in northern Bangkok, from which flight prices are (at least from my experience) significantly lower than those from Suwannaphum ("Suvarnabhumi");
The differences can reach of thousands of Bahts.
But I wonder, if I go outside of Bangkok, could there be an airport in which flight prices to nearby countries (Laos, Cambodia, Vietnam, Myanmar) would be significantly lower than how they are in Bangkok.
For example, taking a 3 hour bus to somewhere outside and around Bangkok in say 150-200 Baht could save a person 1500-2000 Baht on a flight ticket from Don Mueng.
If I one goes outside of Bangkok (in the radius of say 3 hours drive, likely by bus), can flights to nearby countries be cheaper than in Don Mueng?