Flights Bangkok to Chiang Mai (BKK-CNX): Airlines, THB Fares

Bangkok to Chiang Mai is one of Thailand’s busiest domestic routes — around 196 flights a week linking the capital with the principal city of the north. It carries holidaymakers, business travellers, students, residents moving between the two cities, and international visitors connecting onward from Bangkok.

Block time is about 1.2 hours. With five carriers and this much frequency, the route operates as a near-constant shuttle: seats are easy to find from early morning to late evening, and the practical decision is price and timing.

Corridor profile

The BKK–CNX corridor runs about 196 departures a week across 5 carriers, with an average block time of 1.2 hours, and the lowest fare the feed returned for this route is ฿2,525. The frequency figure counts every carrier on the route combined, not any single airline.

Our own demand score. This corridor scores 10/10. That is an editorial ranking we use to prioritise how deeply we cover a route — it is not a passenger count and not a price index. A high score means a corridor people search and where options exist, which usually means price competition. A low score does not mean a bad route; it means fewer options, and where options are few, flexibility gets expensive.

What frequency tells you when plans break. 196 weekly departures is ~28 departures a day — if one departure is cancelled there is normally another the same day. That is why frequency matters more than price for anyone with a fixed commitment at the other end. A thin corridor deserves a buffer day before anything that cannot move, not because the airline is poor but because there is no spare inventory to shift you onto.

Airlines & baggage

Baseline baggage on BKK–CNX runs 7–30 kg across the 5 of 5 carriers on the route for which we hold a row. These are carrier reference baselines, not entitlements attached to every ticket: cabin class, fare brand and frequent-flyer status all change the weight you actually get.

Some items are not measured in kilograms alone. Sports equipment, instruments, pushchairs and oversized boxes are handled under size and item-type rules rather than the kilogram figure in the table. Several categories need advance notice because hold space is finite, and lithium batteries carry separate safety requirements that bar them from checked baggage. Check all three before travel day — at the desk the only remaining options are abandon it or ship it separately.

Airlines on this route

5 carriers operate BKK–CNX — 1 full-service and 4 low-cost. Alliances present on the route: Star Alliance. Multiple carriers only affect price when both sides are actually selling in the same window. The lowest fare the feed returned for this route is ฿2,525 on a 2026-09-18 departure.

Five carriers fly BKK-CNX: Thai Airways on the full-service side, with Thai AirAsia, Thai Vietjet, Nok Air and Thai Lion Air covering the low-cost end. Thai Airways fares include baggage; the low-cost carriers price the base seat low and sell baggage and extras separately. On a short domestic flight, comparing the all-in THB cost once add-ons are counted is the fair way to judge value.

The floor changes hands. Across our 7 weekly captures (2026-W20–2026-W31) the lowest fare sat with 2 different carriers, Thai Vietjet holding it most often at 2 of them. Loyalty to one airline on this corridor therefore has a price. With N=7 this is a small sample — directional, not conclusive.

Fare trends

Between 2026-W20 and 2026-W31 we captured the BKK–CNX low 7 times, ranging ฿1,098 to ฿2,525 — a 130% spread. The cheapest reading fell in week 2026-W24, and from first capture to last the low moved up 24%.

BKK-CNX fares stay competitive thanks to the frequency, lifting around the cool-season high season in the north, the year-end holidays and festival periods. The cheapest seats are the low-cost carriers’ early-released fares — booking two to five weeks ahead usually lands a good price, and mid-week departures undercut weekends. The hot-season and rainy months are the quietest and cheapest.

How to read a 130% spread. The gap between the cheapest and dearest week is the size of the movement this corridor showed in the window we observed. A wide spread means timing matters a lot; a narrow one means the fare is stable and watching it is not worth your time. The figure measures only the lows we captured, not every seat sold that week.

Seasonality & best time to book

Our catalogue lists 5 carriers on this city pair. BKK–CNX is a regional corridor with a shorter booking window than long-haul. The fare tracks low-cost promotional cycles and Thai long weekends more than any season at the destination, and Songkran plus the consecutive-holiday blocks are the tightest weeks of the year.

Bangkok–Chiang Mai fares move with demand. The cheapest windows fall outside school holidays, Songkran and New Year; book 4–8 weeks ahead for normal dates.

The booking window matters more than the booking day. On a 1.2-hour corridor the fare tracks how many seats remain in each fare bucket, not which weekday you click buy. The folklore about a magic booking day has no support in the series we capture. What does show up is widening your travel dates by a day or two.

Thai public holidays are the controllable variable. The holiday calendar is published a year ahead and is the one part of the equation you know before the airline reprices. Shifting out of a consecutive-holiday week by even two days moves you off the tightest demand for both seats and rooms — a bigger effect than switching airline.

About Chiang Mai

Chiang Mai (CNX) sits in Thailand. The flight from Bangkok runs about 1.2 hours. The lowest fare the feed returned for this route is ฿2,525 on a 2026-09-18 departure. The trend figures rest on 7 weekly captures since week 2026-W20.

Chiang Mai is the principal city of northern Thailand, set in a valley among forested hills — an old walled centre dense with temples, surrounded by a modern city and, beyond it, the mountains and hill country of the north. It has a distinct northern Thai character, a strong food and craft culture, and a cooler climate than the central plains. For travellers from Bangkok it is the standard northern destination and the gateway to the wider region, from Chiang Rai to the national parks.

What visa-free does not mean. Entering without a visa in advance is not a right to work, not a right to study, and not a guarantee of admission — the officer at the border still decides. The conditions most often forgotten are remaining passport validity, an onward ticket and proof of accommodation. All three are asked for more often than travellers expect, and their absence lets the airline refuse boarding at the departure airport.

Passenger rights on BKK–CNX

Our catalogue lists 5 carriers on this city pair. Departures from Thailand fall under Thailand CAAT; the return from Chiang Mai falls under Thailand CAAT. The two regimes are not the same, and what you are owed changes with the direction of travel and the nationality of the operating carrier — never with the fare you paid.

No European-style compensation schedule applies here. The destination sits with Thailand CAAT, which typically imposes duty of care, re-routing and refund obligations but no fixed EU261-style cash bands. The enforceable floor is therefore the airline’s own conditions of carriage plus Thailand CAAT rules for departures from Thailand. Read the conditions of carriage before you buy — that is the document that actually binds you.

Baggage loss and delay run on a separate rulebook. An airline’s liability for baggage that is lost, damaged or delayed on an international journey sits under the Montreal Convention 1999 where both the origin and destination states are parties. The caps are denominated in SDR and revised periodically, so only the current figure is usable. This frame is entirely separate from delay compensation: you can have no compensation claim and still have a baggage claim.

FAQ

Which airlines fly Bangkok to Chiang Mai?

The BKK-CNX route is operated by Thai Airways, Thai AirAsia, Thai Vietjet, Nok Air and Thai Lion Air. Compare baggage, alliances and fares in the table above.

How long and how often is the BKK-CNX flight?

Block time is ~1.2h, with ~196 flights per week across all carriers.

When is BKK-CNX cheapest to book?

Book 4–8 weeks ahead; avoid Songkran, school holidays and peak season to save 15–30%.

What exactly is the lowest fare shown on this page?

It is the cheapest fare our cache has recorded on BKK–CNX, captured one snapshot at a time. It is not an average, not a live quote and not a guarantee that a seat still exists at that price. Use it as a reference floor, then check live pricing.

What is the difference between a direct and a nonstop flight?

Direct means the flight number does not change, but the aircraft may still land en route. Nonstop means no intermediate landing at all. If the clock matters, filter on nonstop, not direct.

If my BKK–CNX flight is cancelled, who is responsible?

The destination sits with Thailand CAAT, which generally imposes duty of care, re-routing and refunds but no fixed EU261-style cash bands. The enforceable floor is the airline’s conditions of carriage plus Thailand CAAT rules for departures from Thailand.

Will my bag be through-checked if I book two separate tickets?

No. Through-checking happens only when every sector is on one ticket or an interline agreement exists. On separate tickets you reclaim the bag, clear the transit country’s immigration and check in again — and a missed connection is a new ticket at your cost.

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Related

• BKK airport
• CNX airport