Thailand is cheap in most of the country and genuinely not cheap in a few specific places, and those places are where most visitors go. The regional spread is wide enough that the same daily budget produces very different trips.
What a day costs, by region
| Region | Room | Daily total |
|---|---|---|
| Isaan (northeast) | 250–500 THB | 600–900 |
| Chiang Mai / north | 300–600 | 700–1,000 |
| Bangkok | 400–800 | 900–1,400 |
| Gulf islands | 500–900 | 1,100–1,600 |
| Koh Lanta, Krabi | 500–1,000 | 1,100–1,800 |
| Phuket, Phi Phi (peak) | 1,500–3,000 | 2,500–4,000 |
Weighting a trip toward the north rather than the Andaman islands in January is worth more than every other saving combined.
The north
Chiang Mai is the best value city in Thailand — old-city guesthouses at 300–600 baht, superb markets, and free or near-free temples. A month there on a modest budget is comfortable rather than austere.
Pai is cheaper still, small, and wears thin for some people after a few days.
The Mae Hong Son loop is the best thing to do from Chiang Mai: 600 km of mountain road over four days. Splitting a rental car between two people costs about 4,000 baht including fuel — less than most organised tours and considerably safer than the motorbike version, since travel insurance generally excludes motorbike accidents without a licence valid for the engine size.
Timing caveat: avoid February to April, when agricultural burning pushes Chiang Mai's air quality to among the worst readings in the world.
Isaan, the region nobody visits
The northeast — Khon Kaen, Udon Thani, Nong Khai, Ubon Ratchathani — sees very few foreign travellers and prices reflect local wages rather than tourism.
Khmer temple ruins at Phanom Rung, the Mekong river towns, and arguably the best food in Thailand: som tam, larb and grilled chicken all originate here.
Less English and thinner infrastructure, which is precisely why it stays cheap.
Islands, chosen carefully
Koh Lanta is the best value on the Andaman side — calmer than Phi Phi, far cheaper than Phuket, with long beaches.
Koh Tao is cheap by island standards and is where most people do a dive certification, at roughly 9,000–11,000 baht for an open water course — the best value scuba in the world.
Koh Phangan outside the full moon dates is quiet and reasonable.
Remember the two coasts run opposite seasons: Andaman is best November to April, the Gulf January to August and wettest in November.
What breaks the budget
Ferry stacking. Each island hop is 300–600 baht plus transfers at both ends. Three islands in ten days is several days of budget spent on boats.
Beachfront restaurants. Two streets inland, the same meal is a third of the price.
Organised tours, frequently doable independently for a fraction.
Bar districts. Beer from a shop is 60–80 baht; the same beer on Khao San or Bangla Road is triple.
The green season option
May to October on the Andaman coast cuts accommodation 40–55 percent. Rain comes in heavy afternoon bursts, mornings are often clear, and the beaches are close to empty.
What you lose is boat reliability — Phi Phi and Similan crossings get cancelled in rough seas. Do not build a trip around a single crossing, and keep a spare day before any international flight home.