About Trinity Airways

Trinity Airways is the new identity of T'way Air, South Korea's pioneering low-cost carrier, following a full rebrand completed on 10 September 2026. The airline operates under IATA code TW and ICAO code TWB, with its aircraft callsign changed from TEEWAY to SONOROUS as part of the rebrand. Trinity Airways is based in Seoul, running its network from dual hubs at Incheon International Airport (ICN) and Gimpo International Airport (GMP), and serves around 46 destinations spanning domestic South Korea, Japan, and Southeast Asia, alongside a long-haul link to Australia.

The airline is owned by Sono Trinity Group (formerly Daemyung Sono Group), a major Korean hotel and resort conglomerate that acquired a controlling stake in June 2025. As part of the ownership change, the carrier is repositioning from a pure low-cost model toward what it describes as a "selective service carrier," gradually introducing premium airport lounges, upgraded meals, in-flight entertainment, and onboard Wi-Fi, alongside a new loyalty programme linked to Sono Trinity Group's hotel and resort portfolio. For Australian travellers, Trinity Airways is best known for its nonstop service between Sydney and Seoul Incheon, the airline's first route beyond Asia. Existing T'way Air bookings, flight numbers, and schedules carried over unchanged through the rebrand, and Traveloka continues to list availability under the same TW flight numbers.

Airline Overview and History

Trinity Airways traces its roots back two decades in the South Korean aviation market, moving from a small domestic start-up to one of the country's three major low-cost carriers before its most recent transformation into a hybrid "selective service" airline. Key milestones include:

• 2005 - The airline is founded as Hansung Airlines, becoming South Korea's first low-cost carrier
• 2010 - The carrier relaunches under new management and ownership as T'way Air, with the name representing "Tomorrow," "Together," and "Treasure"
• 2010s - T'way Air expands its domestic Korean network and adds regional international routes across Japan and Southeast Asia, growing into one of Korea's three major LCCs alongside Jeju Air and Jin Air
• October 2022 - T'way Air launches Seoul Incheon to Sydney, its first long-haul route and first service outside Asia, using widebody aircraft
• June 2025 - Daemyung Sono Group, a Korean hotel and resort conglomerate, acquires a controlling stake in T'way Air
• May 2026 - Daemyung Sono Group rebrands itself as Sono Trinity Group
• 4 September 2026 - The airline's radio callsign changes from TEEWAY to SONOROUS ahead of the public rebrand
• 10 September 2026 - T'way Air completes its transition to the Trinity Airways brand across its website, app, and airport check-in counters, while keeping the TW flight code, schedules, and existing bookings unchanged

The rebrand marks a strategic shift away from a pure budget-carrier identity toward a "selective service carrier" model sitting between full-service and low-cost, with plans to phase in premium lounges, improved meals, in-flight entertainment, onboard Wi-Fi, and a loyalty programme tied to Sono Trinity Group's hotels and resorts. Because this transition is still rolling out through late 2026, the specific in-flight product available on any given Trinity Airways flight can vary — travellers should check the current offering for their exact flight when booking.

Fleet and Aircraft

Trinity Airways operates a mixed narrowbody and widebody fleet suited to its combination of short-haul domestic/regional flying and its single long-haul route to Australia:

• Boeing 737-800 - The backbone of the airline's domestic Korean and regional Asian network, used on routes across Japan and Southeast Asia
• Boeing 737-8 (737 MAX) - A newer-generation narrowbody offering improved fuel efficiency, progressively added alongside the 737-800 on medium-haul regional routes
• Airbus A330-300 - The airline's widebody aircraft, used on its long-haul Seoul-Sydney service

As part of its long-haul expansion and the transition to a widebody-capable network, the airline has also reportedly explored leasing Boeing 777-300ER aircraft as a bridge until further widebody deliveries arrive. Aircraft are maintained to South Korean and international civil aviation standards, with scheduled heavy maintenance carried out by certified maintenance providers.

Top Flight Routes

Trinity Airways' only current direct link to Australia is its Seoul Incheon-Sydney service, launched in October 2022 as the airline's first long-haul route. The route is operated with widebody aircraft and runs seasonally, typically across the Northern Hemisphere autumn-to-spring period (broadly October through March) with the exact number of weekly flights varying by season — always check current schedules and fares before booking, as long-haul frequencies on this route have shifted from year to year.

Travellers departing from Melbourne, Brisbane, Perth, or other Australian cities do not have a direct Trinity Airways option and would typically first fly to Sydney, or connect through Seoul Incheon on another carrier and pick up Trinity Airways' domestic Korean or regional Asian network from there — useful for onward travel to Japan or Southeast Asia after arriving in Seoul. Within Korea and the region, Trinity Airways' network centres on Incheon and Gimpo, connecting Seoul to major domestic cities such as Busan and Jeju, along with international points across Japan and Southeast Asia.

Use the flight search on this page to check live Trinity Airways fares and schedules for your dates, and compare against other airlines flying similar routes from Australia to Korea.

Baggage Allowance and Policies

Cabin Baggage

• Weight limit: 10 kg combined for your main carry-on bag and personal item
• Main carry-on: One bag, maximum dimensions approximately 55 x 40 x 20 cm including handles and wheels
• Personal item: One small additional item such as a handbag, laptop bag, or small backpack that fits under the seat in front of you, counted within the same 10 kg total

Checked Baggage

Free checked baggage on Trinity Airways depends on the fare type and route booked:

• Smart / General fares (routes other than Guam/Saipan): Includes 15 kg of free checked baggage
• Event fares: No free checked baggage included on non-Guam/Saipan routes — checked bags must be purchased as an add-on
• Guam/Saipan routes: A different allowance of up to 23 kg free checked baggage applies
• Maximum weight per bag: 32 kg — heavier items must be split into separate pieces
• Maximum size: Total dimensions (length + width + height) must not exceed 203 cm per bag

Because allowances vary by fare and route, and Trinity Airways' policies may continue to evolve as the rebrand and service-model change roll out, it's worth adding any checked baggage you need at the time of booking on Traveloka rather than assuming it's included, and double-checking the allowance shown for your specific fare.

Prohibited and Restricted Items

Trinity Airways follows standard South Korean and international aviation security rules, prohibiting flammable materials, explosives, and sharp objects from both cabin and checked baggage, and restricting lithium batteries, power banks, and e-cigarettes to carry-on baggage only. Oversized items such as sporting equipment or musical instruments may need to be arranged with the airline in advance.

Check-in Guide

Online Check-in

Trinity Airways offers online check-in through its website and app:

• Domestic flights within Korea: Opens 24 hours before departure and closes around 40 minutes before scheduled departure
• International flights, including Sydney-Seoul: Opens 24 hours before departure and closes around 1 hour before scheduled departure

Passengers checking in online with checked baggage still need to drop bags at a baggage counter at the airport before proceeding to security.

Airport Check-in

• Domestic flights: Arrive at least 90 minutes before scheduled departure
• International flights, including Sydney-Seoul: Arrive at least 3 hours before scheduled departure, allowing time for check-in, immigration, and security

Arrival and check-in windows can vary slightly by airport, so it's worth confirming the exact cut-off times for your departure airport ahead of travel, particularly during the transition period following the Trinity Airways rebrand.

Cabin Classes and In-Flight Experience

Historically, T'way Air operated an all-economy, low-cost cabin experience typical of Asian budget carriers, with buy-on-board food and drink and no built-in seat-back entertainment on its narrowbody fleet. Under the Trinity Airways rebrand, the airline is progressively introducing a more premium "selective service" product, including upgraded meals, in-flight entertainment, and onboard Wi-Fi — though the rollout is gradual, so the exact experience can still vary by aircraft and route through this transition period.

On the long-haul Sydney-Seoul service, the widebody Airbus A330-300 cabin has historically offered a more complete economy service than the airline's short-haul narrowbody flights, given the length of the route; travellers should check the current meal, entertainment, and Wi-Fi offering for their specific flight when booking, as these are actively being upgraded as part of the rebrand.

Passenger Policies and Special Services

Travelling with Children and Infants

As with most full-service and low-cost carriers, children generally require their own seat and ticket from around age 2, while infants under 2 can typically travel on an accompanying adult's lap at a reduced fare, with one adult able to accompany one infant. A birth certificate or passport is generally required for young children and infants. Because exact age thresholds and documentation requirements can be updated, confirm the current policy on Trinity Airways' own site or with Traveloka support when booking for a child or infant.

Passengers Requiring Special Assistance

Trinity Airways, like other Korean carriers, offers assistance for passengers with limited mobility, medical conditions, or other special needs, generally requiring advance notice before departure to arrange wheelchair assistance, mobility aids, or portable medical equipment. Contact Trinity Airways or Traveloka support ahead of travel to confirm the notice period and documentation needed for your specific requirement.

Unaccompanied Minors

Trinity Airways offers an unaccompanied minor service on eligible routes for children travelling without an adult, subject to age restrictions and advance paperwork. As with other special-service requests, arrange this directly with the airline or with Traveloka support well ahead of your travel date, since availability and conditions can differ between domestic and international routes such as Sydney-Seoul.

Reschedule, Cancellation, and Refund Policy

Changing Your Flight

To reschedule a Trinity Airways flight booked through Traveloka, open the Traveloka app or website, go to My Booking, select your Trinity Airways booking, and choose the reschedule option to see available new flights and any applicable fees or fare differences.

Flexibility depends on the fare purchased: Smart and General fares generally allow changes for a fee plus any fare difference, while Event and other deeply discounted fares are typically far more restrictive and may not allow changes at all — check the fare conditions shown at the time of booking.

Cancellations and Refunds

Refund eligibility likewise depends on fare type, with higher fare classes generally offering partial refunds (less a cancellation fee) and the lowest promotional fares typically non-refundable or convertible only to airline credit. To request a cancellation or refund, use your booking details on Traveloka and follow the guided process; processing times vary by payment method.

Airline-Initiated Changes

If Trinity Airways cancels or significantly reschedules your flight, you are generally entitled to a full refund, free rebooking on the next available flight, or credit for future travel. Contact Traveloka's 24/7 customer support for help with airline-initiated changes to your booking.

Why Book Trinity Airways Flights on Traveloka

• Clear pricing in AUD - View fares and pay in Australian dollars with transparent pricing that includes taxes and fees
• Easy comparison - Compare Trinity Airways against other carriers flying Sydney-Seoul, and other routes to Korea, by price, timing, and stops
• Flexible payment options - Pay by credit or debit card, PayPal, or Afterpay
• Instant e-ticket - Receive your booking confirmation immediately by email and in the Traveloka app
• 24/7 customer support - Get help with bookings, changes, or travel questions at any time
• Add-on management - Add checked baggage, seat selection, or travel insurance during booking
• Loyalty rewards - Earn Traveloka Points and access member deals and promotions

As Trinity Airways continues rolling out its new service model through the rest of 2026, booking on Traveloka gives Australian travellers a straightforward way to compare fares and confirm exactly what's included before flying Sydney to Seoul.

Tips for Finding Cheap Flights on Traveloka

• Book ahead of time - Long-haul fares to Seoul tend to rise closer to departure, so booking well in advance often secures better pricing
• Be flexible with your dates - Use Traveloka's fare calendar to compare prices across nearby dates on the seasonal Sydney-Seoul route
• Watch for shoulder-season travel - Given the route's seasonal October-to-March operation, fares can vary significantly depending on when in that window you fly
• Turn on Price Alerts - Get notified when fares drop on your preferred Sydney-Seoul dates
• Check Traveloka's promotions page - Look for flash sales and seasonal offers on Trinity Airways and other airlines
• Bundle your trip - Book flights and hotels together on Traveloka for additional savings

How to Book Flight Tickets on Traveloka

1. Visit traveloka.com or open the Traveloka app and go to the Flights section
2. Enter your departure city (for example, Sydney) and destination (Seoul), select your travel dates, and specify passenger numbers
3. Search to see all available flights for your route, including Trinity Airways options
4. Sort by price, departure time, or duration and select your preferred Trinity Airways flight
5. Enter passenger details exactly as shown on each traveller's passport
6. Add extras such as checked baggage, seat selection, or travel insurance if needed
7. Review your booking summary, including fare, taxes, and any add-ons
8. Choose your payment method - credit or debit card, PayPal, or Afterpay - and complete payment
9. Receive your e-ticket instantly by email and in the Traveloka app

Save your e-ticket for reference at the airport, and check that your passport has at least six months' validity from your travel date, along with any visa requirements for Australian passport holders travelling to South Korea.