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Trinity Airways (TW) Guide

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Flights from Seoul and Daegu to Bangkok, Japan, Southeast Asia, Central Asia, Australia and Europe: Trinity Airways routes, fleet, fares, baggage, check-in and tips. Ask a question
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In short

Trinity Airways is the new name of T'way Air, a South Korean low-cost airline owned by Sono Trinity Group and flying from Incheon, Gimpo and Daegu. Its Boeing 737s and Airbus A330s reach Thailand, Japan, Vietnam, Central Asia, Australia and Europe. There is no alliance. Smart fares include 15 kg checked on most routes; Business Saver includes 30 kg, or 40 kg on long-haul.

Trinity Airways is the former T'way Air, rebranded in September 2026 under Sono Trinity Group.

Please note: bookingMentor is an independent travel service and is not affiliated with Trinity Airways. Routes, schedules and baggage rules change, so always confirm the details of your booking with the airline.

What to expect

Trinity Airways is the name T'way Air has flown under since 10 September 2026. The change followed the airline's takeover by Sono Trinity Group, the leisure and resort company previously called Daemyung Sono Group, and the new name draws on the Latin trinitas to stand for flights, hotels and travel services under one roof. Shareholders approved it in March 2026. The flight code stays TW, and flight numbers, schedules and tickets issued under the T'way name all remain valid.

From Hansung Airlines to T'way

The company is older than the brand. It began as Hansung Airlines, which started flying ATR 72 turboprops on 13 August 2005 and stopped in 2009 after financial trouble. It relaunched as T'way in 2010 with two Boeing 737-800s on the Gimpo to Jeju route, earned its first annual profit in 2013 and took its first Airbus A330 in April 2022. The callsign changed from TEEWAY to SONOROUS on 4 September 2026, and the first Trinity Airways flight, Daegu to Jeju, ran on 10 September. Today it is headquartered in Seongdong-gu, Seoul, and flies from Seoul Incheon, Seoul Gimpo and Daegu, its long-standing home in the south-east of Korea. Search results and airport screens may still show T'way for a while, and aircraft are being repainted in stages.

Seoul and Daegu to Bangkok

Bangkok was the airline's first international destination, in October 2011. Two routes reach Bangkok today, both into Bangkok Suvarnabhumi: one from Seoul Incheon and one from Daegu. The Daegu flight saves travellers from Daegu and North Gyeongsang the trip to Incheon. A twice-weekly Busan to Chiang Mai service began in January 2026. Compare all carriers on Bangkok to Seoul flights and Seoul to Bangkok flights.

A Korean low-cost airline with long-haul routes

Trinity Airways flies wide-body jets to Paris, Rome, Barcelona and, in season, Zagreb, as well as Sydney and Vancouver, which is unusual for a Korean low-cost airline. Sydney, announced in October 2022, was the first long-haul route. Frankfurt opened in October 2024 under a concession tied to the Korean Air and Asiana merger and has since been dropped. Shorter routes reach Japan, China, Taiwan, Vietnam, Singapore, Jakarta, Bali, Tashkent and Bishkek. Incheon to Kobe is due from 18 December 2026. The airline codeshares with Eastar Jet and Tigerair Taiwan and has interline deals with Air Premia, ITA Airways and Virgin Australia. It has no Bangladesh flights; Biman and US-Bangla connect Dhaka with Suvarnabhumi.

Fact-checked by the bookingMentor Travel Desk Reviewed · Updated when rules or prices change

Checked against trusted sources:
Trinity Airways official website

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  1. Trinity Airways official website
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Good to know

  • AllianceNone (Sono Trinity Group)
  • Founded2010
  • Online check-inYes

Everything you should know

Airline codes

TW · TWB

IATA · ICAO · callsign “SONOROUS”

Trinity Airways flight numbers start with TW, the same code T'way Air used. Use it to check your flight status and booking.

Key facts

Network

Asia, Australia and Europe

Thailand · Japan · Vietnam · Central Asia · Australia · Europe

Trinity Airways flies from Seoul Incheon, Gimpo and Daegu to Bangkok, Japan, China, Vietnam, Central Asia, Sydney, Vancouver and five European cities.

Destinations

Cabin classes

Business Saver

and Economy

Economy across the fleet and Business Saver seats on part of it.

Compare cabins

Good to know

The airline still uses the TW code, and T'way bookings remain valid. Official website: twayair.com.

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At a glance

Trinity Airways (IATA: TW, ICAO: TWB), known as T'way Air until September 2026, is a South Korean low-cost airline owned by Sono Trinity Group and headquartered in Seoul. It flies Boeing 737s and Airbus A330s from Incheon, Gimpo and Daegu to Asia, Australia and Europe, including Incheon and Daegu to Bangkok.

Key facts about Trinity Airways
HeadquartersSeongdong-gu, Seoul, South Korea
Fleet typesBoeing 737-800 (27), 737-8 (8), 777-300ER (2), Airbus A330-200 (6), A330-300 (5), as of July 2026
Official websitetwayair.com

Flight routes

Destinations and routes

Direct routes
Trinity Airways adds seasonal routes each winter and summer. These are established destinations; confirm the current schedule when you search. Search flights

Thailand

Seoul (ICN) departures1 destination

Fleet and aircraft

Boeing 737s for regional flying and Airbus A330s for long haul.

  • Boeing 737-800 Narrow-body Most short and medium routes, including Daegu to Bangkok
  • Boeing 737-8 Narrow-body Newest deliveries, first to wear the Trinity Airways livery
  • Airbus A330-200 Wide-body Long-haul flying and the busiest Asian routes
  • Airbus A330-300 Wide-body Long-haul flying and the busiest Asian routes
  • Boeing 777-300ER Wide-body Small leased sub-fleet for high-capacity flying

Cabin classes

Economy, plus Business Saver on part of the fleet.

Business Saver Part of fleet

Premium seat

Two 10 kg cabin bags30 kg checked on most international routes40 kg to Europe and Australia

Economy All flights

Event and Smart fares

15 kg checked on Smart faresPooled allowance within one booking32 kg maximum per bag

Frequent flyer programme

Details of the Trinity Airways loyalty programme are being added Trinity Airways is a member of None (Sono Trinity Group), so you may earn miles with its partner programmes.
Join on the airline's site

Baggage allowance

Your allowance depends on the fare (event, Smart or Business) and the region. The exact amount is printed on your booking.

Smart fare checked
15 kg (most routes)
Business checked
30 kg (40 kg long haul)
Business cabin
2 x 10 kg
Maximum per bag
32 kg

Smart fares include 15 kg checked on most international routes. Business fares include 30 kg (40 kg to Europe, Australia, Singapore and Jakarta) and two 10 kg cabin bags.

Pro tip: pool your checked weight with companions on the same booking.
Travel day

Online Check-in

Trinity Airways check-in comes down to four steps, from checking in online to dropping your bags at Incheon International.

  • Online check-in available
  1. Step 1

    Check in online

    Online check-in for TW flights is on the official Trinity Airways website or app. You need the TW booking reference or e-ticket number and the passenger’s surname.

    Booking ref + surname
  2. Step 2

    Prepare your documents

    Pack your passport plus any visa, residence permit or entry papers your destination asks for.

    Passport · visa · ID
  3. Step 3

    Arrive early

    Trinity Airways closes its check-in counters before departure, and passengers who miss the cut-off can be refused boarding. Leave room for bag drop and security at ICN.

    Well before departure
  4. Step 4

    Drop your bags

    Hand in checked luggage at the Trinity Airways counter or bag drop, then keep your boarding pass and passport ready for security and the gate.

    Trinity Airways counter
Departing from Seoul? Terminals, lounges, food and transport at Incheon International, all in one guide.
Seoul Airport guide Check in with Trinity Airways
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Cheap tickets

Practical advice for flying Trinity Airways between Thailand and Korea.

  1. 01

    Search under both names

    Some booking sites and airport boards may still list T'way Air. The TW code is the reliable way to recognise the flight.

    T'way = Trinity
  2. 02

    Fly from Daegu

    Living in Daegu or Gyeongbuk? The nonstop to Bangkok saves a long trip up to Incheon.

    TAE to BKK
  3. 03

    Pool the bags

    Book a family or group on one reservation so the checked allowances can be shared, which helps when one suitcase is heavier than the rest.

    Same booking
  4. 04

    Connect at Suvarnabhumi

    Trinity Airways uses Suvarnabhumi, where most international flights into Bangkok arrive. Leave a wide margin if the tickets are separate.

    Suvarnabhumi

  5. Ready to compare fares?

    Search Trinity Airways alongside every other airline on your route, with flexible dates.

    Search Trinity Airways flights

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Frequently Asked Questions (FAQs)

Everything travellers ask before flying Trinity Airways.
We check these Trinity Airways answers with the airline’s own sources and aviation references every season.

Getting there

Yes. T'way Air began operating as Trinity Airways on 10 September 2026 after its acquisition by Sono Trinity Group. The company, aircraft, staff and TW flight code are the same.

Booking

General