Price the route on an aggregator, then book direct on the winning airline’s app. Budget carriers (AirAsia, Nok, Thai Lion, Thai Vietjet) fly mostly from Don Mueang (DMK); Bangkok Airways & Thai Airways use Suvarnabhumi (BKK) — check which airport your ticket says. Add checked baggage online, never at the counter, and book 2–6 weeks ahead for the lowest fares.
Why most people fly domestically in Thailand
Thailand stretches roughly 1,600 km from the northern hills to the southern islands, so getting around the country is a real journey. Domestic flying has boomed because it collapses those distances: a Bangkok–Chiang Mai or Bangkok–Phuket hop is barely over an hour in the air, against ten to fourteen hours by train or bus. A fiercely competitive market — regulated by the Civil Aviation Authority of Thailand (CAAT) and operating through airports run by Airports of Thailand (AOT) — keeps fares low: book ahead and a one-way ticket across the country can cost less than a night out. For expats and long-stay visitors, that means weekend trips to the islands or the mountains are genuinely affordable, and moving between cities for visa runs, viewings or work is quick and painless.
The airlines: who flies what
Thailand has a healthy mix of budget and full-service carriers. The practical short version:
- Thai AirAsia — the biggest low-cost network and usually the cheapest base fares; flies mainly from Don Mueang (DMK).
- Nok Air — budget carrier with a strong domestic map, especially the north and Isaan; based at Don Mueang.
- Thai Lion Air — another low-cost option on the main trunk routes; also Don Mueang.
- Thai Vietjet — budget carrier that flies from both Bangkok airports, so always check which one your flight uses.
- Bangkok Airways — a “boutique” carrier, pricier but with baggage and lounge included, and the only airline into its own Koh Samui (USM) and Trat (TDX) airports.
- Thai Airways — the full-service flag carrier for premium comfort on key domestic legs, from Suvarnabhumi.
No single airline wins everywhere. Compare the specific route, weigh the base fare against baggage and timing, and remember the cheapest sticker price is not always cheapest once you add a bag.
Head-to-head: airport, positioning, baggage & best for
Putting the six carriers side by side on the things that actually change your trip — not on prices, which move daily and should always be checked live on the airline’s own site:
| Airline | Base airport(s) | Positioning | Checked baggage | Best for |
|---|---|---|---|---|
| Thai Airways | Suvarnabhumi (BKK) | Full-service flag carrier; wider seats, meal service | Included in fare | Comfort on key domestic legs, connecting to an international THAI itinerary |
| Bangkok Airways | Suvarnabhumi (BKK), plus its own Samui (USM) & Trat (TDX) | “Boutique” carrier; smaller cabins, in-house airport lounges | Included in fare | Koh Samui & Koh Chang routes only this airline serves; comfort without full-service pricing |
| Thai AirAsia | Don Mueang (DMK) | Region’s largest low-cost network; widest route map | Add-on, cheaper booked online | Cheapest base fares, widest choice of routes and times |
| Nok Air | Don Mueang (DMK) | Thailand-founded budget carrier; strong secondary-city network | Add-on, cheaper booked online | Routes into smaller northern & Isaan cities other budget carriers skip |
| Thai Lion Air | Don Mueang (DMK) | Budget carrier on the busiest trunk routes | Add-on, cheaper booked online | Back-up low fares on high-frequency routes like Bangkok–Chiang Mai & Bangkok–Phuket |
| Thai Vietjet | Both DMK and BKK, depending on route | Budget carrier, growing network | Add-on, cheaper booked online | Cross-checking fares, since it is the only carrier that can depart from either Bangkok airport |
Fares change daily and by season, so this page deliberately does not quote numbers — compare live prices on an aggregator, then book on the airline’s own site or app. Aircraft, routes and airport assignments can also shift over time; the pattern above is the reliable part, the specifics on any one date are not.
Bangkok’s two airports: DMK vs BKK
The single biggest newcomer trap is forgetting that Bangkok has two airports on opposite sides of the city:
- Suvarnabhumi (BKK) — the large modern international hub to the east; base for Thai Airways and Bangkok Airways, served by the Airport Rail Link.
- Don Mueang (DMK) — the older airport to the north and the low-cost capital: AirAsia, Nok Air and Thai Lion are based here.
There is no fast direct rail link between the two, and crossing Bangkok between them can take well over an hour in traffic. So always check the airport code on your ticket, leave generous time if you ever have to transfer between DMK and BKK, and never book two separate flights at different airports with a tight gap. For getting to and from either airport, see our airport transfer guide and Grab & ride-hailing guides.
The main routes & flight times
Most domestic flying radiates out of Bangkok. The headline routes and rough flight times:
- North: Chiang Mai (~1h15) and Chiang Rai (~1h20) — mountains, cooler weather, the digital-nomad hub of Chiang Mai.
- South & islands: Phuket (~1h25), Krabi (~1h20), Koh Samui (~1h10, Bangkok Airways), Surat Thani (~1h10, the budget gateway for Koh Samui / Koh Phangan) and Hat Yai (~1h25).
- Northeast (Isaan): Udon Thani, Khon Kaen and Ubon Ratchathani, all roughly an hour.
Trunk routes like Bangkok–Chiang Mai and Bangkok–Phuket run many flights a day, so seats are easy to find. There are also useful non-Bangkok links — Chiang Mai to Phuket, for instance — that save backtracking through the capital.
Baggage, fares & booking smartly
- compare on an aggregator (Google Flights, Skyscanner), then book direct on the airline’s own app to avoid agent fees and ease changes
- budget fares are cabin-bag only — add checked baggage online during booking, never at the airport counter
- book 2–6 weeks ahead on popular routes; much earlier for Songkran, New Year and island high season
- pay attention to the airport code (DMK vs BKK) before you pay
- weigh the true total — base fare + bag + seat — not just the headline price
- arrive early: low-cost check-in desks and bag drops close strictly, and walk-up baggage fees are painful
At the airport: ID & check-in
Domestic flying is quick and informal compared with international travel, but a few basics apply. Carry your passport as photo ID for the gate — it is the universal accepted document for foreigners, even though some airlines will take other government photo ID on domestic sectors. Use the airline’s app to check in online and hold a mobile boarding pass; if you have only cabin baggage you can often go straight to security. Low-cost carriers enforce cabin-bag size and weight limits and close check-in on time, so arrive with margin. There is no immigration for domestic flights, but security screening still applies, so keep liquids and electronics handy. Airport facilities and processes nationwide are operated under Airports of Thailand (AOT) and regulated by CAAT.
Newcomer mistakes to avoid
- assume both your flights use the same Bangkok airport — DMK and BKK are far apart
- book a tight self-transfer between two budget flights, especially across airports (no protection if the first is late)
- buy checked baggage at the counter — it costs far more than adding it online
- turn up for a low-cost flight late — check-in and bag drop close strictly
- judge a fare by the sticker price alone before adding bag and seat
- leave island flights to the last minute in high season, when seats and good fares vanish
- assume every carrier’s baggage and service policy is the same — compare the table above, not just the fare
Frequently asked
Base yourself where Thailand opens up
A home near a major airport turns the whole country into a weekend trip. Browse Bangkok areas and residences with quick airport access.
General information only — airlines, routes, schedules, baggage rules and fares change constantly, and airport assignments can shift. Always confirm your flight’s airport, baggage allowance and check-in times directly with the airline before you travel. BAANLYY never takes paid placement.
Sources & References
Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.
