Thai Airways Carry-On Rules & Bag Size Guide

Thai Airways International is Thailand's national carrier and a Star Alliance member, operating routes across Asia, Europe, Australia, and the Middle East from its hub at Bangkok's Suvarnabhumi Airport (BKK). Known for its premium in-flight service and recognisable purple livery, Thai Airways offers a consistent carry-on policy that differs from many competitors in one important dimension: the allowed carry-on width of 45 cm is notably wider than the 36 cm permitted by regional Southeast Asian carriers. This guide covers everything you need to know about Thai Airways' carry-on rules.

Thai Airways Carry-On Allowance at a Glance

Cabin	Carry-On Bag	Personal Item	Weight
Economy (all fares)	56 × 45 × 25 cm	Under-seat item	7 kg
Premium Economy	56 × 45 × 25 cm	Under-seat item	7 kg
Royal Silk (Business)	56 × 45 × 25 cm	Under-seat item	10 kg
Royal First	56 × 45 × 25 cm	Under-seat item	10 kg

Business Class (Royal Silk) and First Class (Royal First) passengers receive a 10 kg carry-on weight allowance, plus priority boarding. The size limit is consistent across all cabins.

Carry-On Bag Dimensions in Centimetres and Inches

Measurement	Centimetres	Inches
Length	56 cm	22.0 in
Width	45 cm	17.7 in
Depth	25 cm	9.8 in

Width Comparison

Thai Airways' 45 cm width allowance is wider than most Southeast Asian carriers:

Airline	Carry-On Width Allowed
Thai Airways	45 cm
Singapore Airlines	35 cm
Garuda Indonesia	36 cm
Malaysia Airlines	36 cm
Emirates	38 cm
British Airways	40 cm

This generous width means that many standard international carry-on bags — particularly the common 55 × 40 × 20 cm size sold in Europe and North America — fit comfortably within Thai Airways' allowance. It is one of the wider width limits among Asian carriers.

Personal Item Policy

All Thai Airways passengers may bring one personal item:

• Placement: Under the seat in front of you
• Weight: No published weight limit
• No published maximum dimensions — must fit under the seat
• Examples: Laptop bag, handbag, small backpack, camera bag, purse

The personal item allowance has no published weight or size limits. In practice, a laptop bag, handbag, or small backpack fits under the seat without issue. Larger items (a large camera backpack, an overfull daypack) may be flagged if they do not fit under the seat.

Weight Enforcement: 7 kg in Economy

Thai Airways enforces the 7 kg Economy carry-on limit. Points to be aware of:

• Weighing at check-in is common at Suvarnabhumi Airport (BKK)
• Gate weighing is less common than at European LCC airports but does occur on busy routes
• Bags clearly overweight may be redirected to the hold at any point in the departure process
• Business Class passengers are rarely scrutinised on weight due to the 10 kg allowance

At 7 kg, the weight limit is on the lower side. A lightweight carry-on bag (soft-sided, 1–1.5 kg empty) leaves more room for contents than a heavy hard-shell case.

Domestic Thai Flights

Thai Airways operates domestic routes within Thailand, connecting Bangkok (BKK, DMK) with Chiang Mai (CNX), Phuket (HKT), Hat Yai (HDY), and other destinations. Note that some domestic Thai routes are operated by Thai Smile Airways, a regional subsidiary:

• Thai Smile has similar but separate carry-on rules
• Some Thai Smile routes allow 7 kg carry-on in Economy, consistent with Thai Airways
• Confirm the operating carrier on your domestic booking

On domestic routes, aircraft include the Airbus A320 and Boeing 737, with smaller overhead bins than wide-body aircraft. The 45 cm width allowance is more liberal than these bins may comfortably accommodate on some aircraft.

International Long-Haul Routes

Thai Airways operates long-haul routes from Bangkok (BKK) to:

• Europe: London (LHR), Frankfurt (FRA), Paris (CDG), Amsterdam (AMS), Munich (MUC), Zurich (ZRH), Vienna (VIE), Brussels (BRU), Rome (FCO), Stockholm (ARN), Copenhagen (CPH), Oslo (OSL)
• Australia: Sydney (SYD), Melbourne (MEL), Brisbane (BNE)
• North America: Los Angeles (LAX) via Seoul (ICN) or Tokyo (NRT)
• Asia: Tokyo (NRT, HND), Osaka (KIX), Seoul (ICN), Beijing (PEK), Shanghai (PVG)

On wide-body aircraft (Boeing 777-300ER, Boeing 747-400, Airbus A350-900), overhead bins are large and can accommodate standard carry-on bags. The 45 × 25 cm cross-section is generous for most overhead bin configurations.

Royal Orchid Plus Loyalty Benefits

Royal Orchid Plus is Thai Airways' frequent flyer program:

Status	Priority Boarding	Economy Carry-On	Extra Checked Bags
Silver	Yes	7 kg (same)	10 kg extra
Gold	Yes	7 kg (same)	20 kg extra
Platinum	Yes	7 kg (same)	30 kg extra

Status provides priority boarding (valuable for overhead bin access) and extra checked baggage but does not increase the Economy carry-on weight limit.

Star Alliance Benefits on Thai Airways

Thai Airways is a member of Star Alliance. On Thai Airways-operated flights, Star Alliance Gold card holders (from any Star Alliance airline) receive priority boarding and extra checked baggage. The carry-on size and weight limits remain the same for all passengers.

Tips for Thai Airways Passengers

Take advantage of the 45 cm width. Most international carry-on bags (55 × 40 × 20 cm is a common standard) fit within Thai Airways' 56 × 45 × 25 cm allowance with room to spare. This is particularly good news if you have a standard European- or US-market cabin bag.

Weigh your bag at home. The 7 kg Economy limit is enforced at Suvarnabhumi. A portable luggage scale is worth using before any Thai Airways departure.

Use the personal item for heavy essentials. No weight limit on the personal item (under-seat) means your laptop, camera, and shoes can travel there without affecting your 7 kg carry-on budget.

Arrive early at Suvarnabhumi (BKK). BKK is a large airport with long walking distances between check-in, security, and departure gates. Allow at least two hours for domestic departures and three hours for international flights. The airport's concourses are wide but the gates can be a considerable walk from the main hall.

Check whether your flight is Thai Airways or Thai Smile. On some shorter regional routes, flights marketed under the Thai Airways code may be operated by Thai Smile, which has its own carry-on policy. Verify the operating carrier in your booking confirmation.

Security and Restricted Items

Thai Airways flights depart under the authority of the Civil Aviation Authority of Thailand (CAAT) and international agreements:

• Liquids: 100 ml per container in a 1-litre transparent bag per passenger
• Lithium batteries: Spare batteries in carry-on only; power banks in carry-on only
• Electronic devices: Standard declaration procedures for laptops at some security checkpoints (may need to be removed from bags)
• Thai customs: When travelling to Thailand, declaration is required for certain goods and large amounts of cash

For UK-bound flights departing BKK, UK CAA and UKBF rules apply at UK airports. For Australian-bound flights, Australian Border Force and Biosecurity rules apply on arrival.

The Bottom Line

Thai Airways offers one of the wider carry-on allowances among Asian carriers: 56 × 45 × 25 cm fits most international cabin bags comfortably. The 7 kg Economy weight limit is enforced at BKK and requires a lightweight bag and careful packing. Business and First Class passengers get 10 kg and priority boarding. Use the personal item for your laptop and heavy items, weigh before you fly, and arrive early at the well-designed but large Suvarnabhumi hub. The wide size allowance is Thai Airways' stand-out advantage for carry-on travellers compared to regional competitors.

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Rules change — verify with Thai Airways before flying.