Domestic Flights in Thailand: What Expats Should Know
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Key Takeaways
- Bangkok operates two separate airports, Suvarnabhumi (BKK) and Don Mueang (DMK), roughly 50km apart; booking a domestic flight from the wrong one relative to your arrival airport is one of the most common and costly mistakes travellers make.
- Budget airlines like Thai AirAsia, Nok Air, and Thai Lion Air offer fares from around 800 to 2,500 THB on popular routes, but strictly enforce a 7kg cabin baggage limit with steep fees for anything beyond it.
- Full-service carriers like Thai Airways and Bangkok Airways cost considerably more but include checked baggage, meals, and greater schedule flexibility, generally worth it if you're travelling with significant luggage.
- Bangkok Airways holds a near-monopoly on flights to Koh Samui, since it owns the island's airport and denies landing rights to budget competitors, making this route Thailand's most expensive by a clear margin.
- Buying checked baggage online during booking is meaningfully cheaper than adding it later through the airline's app, and far cheaper than paying at the airport counter on departure day.
- Since May 2025, domestic flight delays exceeding 5 hours entitle passengers to 1,200 THB compensation, an increase from the previous 600 THB, under updated Civil Aviation Authority passenger rights rules.
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Frequently Asked Questions
Why do I need to know which Bangkok airport my flight uses?
Bangkok operates two separate airports roughly 50km apart, Suvarnabhumi (BKK) and Don Mueang (DMK). Booking a domestic departure from the airport you didn't arrive at leaves you rushing across a congested city with all your luggage, a genuinely common and avoidable mistake.
How strict are the baggage limits on Thai budget airlines?
Very strict. Airlines like Thai AirAsia, Nok Air, and Thai Lion Air enforce a 7kg cabin baggage limit rigorously, sometimes weighing bags at the gate on full flights. Going over means being forced to check the bag at a penalty rate, commonly up to 1,500 THB.
Should I fly budget or full-service for domestic routes?
It depends on your baggage and comfort needs. Budget carriers offer the lowest base fares but charge for everything beyond a 7kg cabin bag. Full-service airlines like Thai Airways and Bangkok Airways cost more but include checked baggage, meals, and greater flexibility, often worthwhile if you're travelling with substantial luggage.
Why are flights to Koh Samui so much more expensive?
Bangkok Airways owns Koh Samui's airport and denies landing rights to budget competitors like AirAsia and Thai Lion Air, creating a near-monopoly. This makes Bangkok–Koh Samui one of Thailand's most expensive domestic routes, commonly 2,500 to 5,000 THB one way.
What's the cheapest way to add checked baggage?
Buy it online during your initial booking, this is meaningfully cheaper than adding it later via the airline's app, and considerably cheaper than paying at the airport check-in counter on the day of departure, which can cost roughly triple the advance-booking price.
What happens if my domestic flight is significantly delayed?
Since May 2025, updated Civil Aviation Authority rules entitle passengers to 1,200 THB compensation for domestic flight delays exceeding 5 hours, an increase from the previous 600 THB, provided in cash or equivalent value.
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Journey Stage: I Live In Thailand
Reading Time: 11 minutes
Last Updated: June 2026
Thailand’s domestic flight network is genuinely one of the most extensive and affordable in Southeast Asia, but a few practical details, mostly around airports and baggage, make the difference between a smooth trip and an expensive scramble.
Bangkok’s two-airport trap
This is the single most important thing to get right: Bangkok operates two separate commercial airports roughly 50km apart. Suvarnabhumi (BKK) handles full-service airlines and some budget carriers; Don Mueang (DMK) handles AirAsia, Nok Air, and Thai Lion Air specifically. If your international flight lands at BKK and your domestic departure is booked from DMK, you’re looking at over an hour of transfer time across a congested city with all your luggage. Always double-check the airport code on your domestic ticket against your arrival airport before booking.
Budget airlines: cheap fares, strict rules
Thai AirAsia, Nok Air, Thai Lion Air, and VietJet dominate the budget end of the market, with advance-booked fares commonly running 800 to 2,500 THB on popular routes like Bangkok to Chiang Mai or Phuket. The catch: every one of these carriers enforces a strict 7kg cabin baggage limit, often weighed at the gate on busier flights, with penalty fees up to 1,500 THB if you’re caught over. Buying checked baggage online during your initial booking is considerably cheaper than adding it later through the app, and far cheaper again than paying at the airport counter on departure day.
Full-service carriers: paying more for genuine flexibility
Thai Airways and Bangkok Airways sit at the premium end, typically 1.5 times pricier than budget competitors, but include checked baggage (commonly 20 to 30kg), meals, and considerably more flexibility around rebooking. If you’re travelling with substantial luggage, connecting to an international flight, or simply value comfort over squeezing out the lowest fare, this tier is genuinely worth the extra cost rather than a wasteful upgrade.
Why Koh Samui flights cost so much more
Worth knowing specifically: Bangkok