Primary sources · 4
- [1] Singapore Airlines SQ23 service — Carrier-published distance 8,288 NM = 15,349 km, block time 18 h 40 min · Singapore Airlines public schedule · 2024–2025 timetable https://www.singaporeair.com
- [2] Qantas Project Sunrise programme — Planned Sydney–London and Sydney–New York non-stops on A350-1000ULR from 2026 · Qantas Group · Programme announced 2022 https://www.qantas.com
- [3] Airbus A350-900ULR specifications — Range 9,700 NM / 17,964 km, configured 161 seats for Singapore Airlines ULR routes · Airbus product page · Current https://aircraft.airbus.com/en/aircraft/a350/a350-900
- [4] OpenFlights — airport coordinate database — Distances on this page computed from OpenFlights coordinates using Vincenty · openflights.org · Current https://openflights.org/data.php
The world's longest non-stop flights cluster between 14,000 and 16,000 kilometres — past the range of even the largest current twin-aisles unless they sacrifice payload for fuel. Two airlines (Singapore and Qantas) operate most of the top-ten routes; one aircraft family (Airbus A350-900ULR) makes most of them possible.
The current top ten
The list below ranks scheduled non-stop commercial passenger flights by great-circle distance, computed from OpenFlights coordinates using the WGS-84 Vincenty inverse. Distances are end-to-end great-circle — actual flown distance is typically 1–4 % longer due to ATC routing and wind optimisation. Block times are airline-published schedules and include ground time.
| Rank | Route | Airline | Aircraft | Distance (km) | Block time |
|---|---|---|---|---|---|
| 1 | SIN → JFK (Singapore – New York JFK) | Singapore Airlines | A350-900ULR | 15,349 | 18h 40m |
| 2 | SIN → EWR (Singapore – Newark) | Singapore Airlines | A350-900ULR | 15,341 | 18h 30m |
| 3 | AKL → DOH (Auckland – Doha) | Qatar Airways | 777-200LR | 14,535 | 17h 30m |
| 4 | PER → LHR (Perth – London) | Qantas | 787-9 | 14,499 | 17h 25m |
| 5 | AKL → DXB (Auckland – Dubai) | Emirates | 777-200LR | 14,193 | 17h 5m |
| 6 | MEL → DFW (Melbourne – Dallas) | Qantas | 787-9 | 14,121 | 16h 50m |
| 7 | BNE → LAX (Brisbane – Los Angeles) | Qantas | 787-9 | 11,608 | 13h 30m |
| 8 | DFW → SYD (Dallas – Sydney) | Qantas | A380 | 13,800 | 16h 50m |
| 9 | SFO → SIN (San Francisco – Singapore) | Singapore Airlines / United | A350-900 / 787-9 | 13,602 | 16h 30m |
| 10 | ATL → JNB (Atlanta – Johannesburg) | Delta | A350-900 | 13,581 | 16h 30m |
A short history of ULR
Ultra-long-range scheduled service is younger than most travellers realise. The first attempt at routine 18-hour non-stops was Singapore Airlines' 2004–2013 operation of the Airbus A340-500 on SIN to LAX and SIN to EWR, retired when fuel prices made the four-engine aircraft uneconomic. The route returned in 2018 on the A350-900ULR, a purpose-engineered twin that solved the fuel-vs-payload problem the A340-500 could not.
| Era | Aircraft | Routes | Why it ended (or continues) |
|---|---|---|---|
| 2004 – 2013 | Airbus A340-500 | SIN ↔ LAX, SIN ↔ EWR | Four engines at 2008 fuel prices made unit economics untenable; retired November 2013 |
| 2018 – present | Airbus A350-900ULR (7 aircraft, all to SIA) | SIN ↔ EWR (2018), SIN ↔ JFK (2020) | Operating; SQ has begun a multi-billion-dollar retrofit adding first class to all seven aircraft |
| 2027 – planned | Airbus A350-1000ULR (12 aircraft on order to Qantas) | SYD ↔ LHR (March 2027), SYD ↔ JFK (from 2028) | Project Sunrise — first frame rolled out April 2026, delivery October 2026 |
The pattern is consistent: each new ULR generation has needed bespoke engineering (extra fuel tanks, lighter cabin configurations, sometimes new engines) and a launch customer willing to underwrite the non-recurring cost. Airlines that have considered ULR but not committed — notably Cathay Pacific and Emirates — have repeatedly cited the payload-versus-fuel sensitivity as the gating constraint.
What makes ULR possible
Ultra-long-range (ULR) flying requires the aircraft to carry enough fuel to remain airborne for 17–19 hours with reserves. The Airbus A350-900ULR is the only current production aircraft optimised for this — a modified A350-900 with two additional fuel tanks giving 9,700 NM / 17,964 km of range, configured for 161 passengers (no economy cabin) on Singapore's SIN–JFK / SIN–EWR services to keep weight low.
The A350-900ULR's 9,700 NM range gives ~17,964 km of theoretical straight-line capability — comfortably beyond the 15,349 km SIN–JFK route, with enough margin for headwinds, ATC re-routes, and the FAA- required reserve fuel for diversion.
The fuel-vs-payload trade
The math behind ULR is unforgiving. An A350-900 carrying 165,000 litres of fuel weighs about 132 tonnes empty plus 132 tonnes of fuel plus cabin and cargo — close to its 280-tonne maximum take-off weight with no margin for headwinds. Every additional passenger displaces about 30 kg of fuel range; an additional 30 economy seats wipes out the crew-rest-area weight allowance for the cabin crew that an 18-hour flight actually requires.
| Aircraft / operator | Total seats | Cabin classes | Why the count is what it is |
|---|---|---|---|
| A350-900 (Cathay Pacific, typical) | ≈ 334 | Y / PY / J / F | Maximum revenue density at sub-16,000-km design range |
| A350-900ULR (Singapore Airlines, current) | 161 | PY / J only (no Y, no F) | Weight allowance traded for fuel and crew rest on 18-hour SIN ↔ JFK / EWR |
| A350-900ULR (Singapore Airlines, post-retrofit) | 132 | PY / J / F | Retrofit adds 4 first-class suites per ULR; total seats fall further to fund the floor area |
| A350-1000ULR (Qantas Project Sunrise) | 238 | Y / PY / J / F | 20,000-litre centre-rear tank plus stretched fuselage gives the payload margin SQ's frame lacks |
Singapore Airlines is now spending a multi-billion-dollar capital programme to add four first-class suites per ULR aircraft — pushing the seat total down from 161 to 132. The new layout will be 4 first-class suites, 70 business-class seats, and 58 premium-economy seats. The revenue-per-seat-mile arithmetic is the only way that math works.
Project Sunrise — the next jump
Qantas's "Project Sunrise" programme will introduce Sydney to London (17,016 km, ≈ 20 h) and eventually Sydney to New York (≈ 16,000 km, ≈ 19 h) non-stops using the Airbus A350-1000ULR — a stretched A350 with a 20,000-litre additional centre-rear fuel tank and a 22-hour endurance envelope. Airbus rolled out the first frame (registration F-WZNK) for Qantas in April 2026, with Rolls-Royce Trent XWB-97 engines already fitted, and the first commercial Sydney-London service is targeted for March 2027.
| Milestone | Date | Status |
|---|---|---|
| First frame rollout (F-WZNK) | April 2026 | Complete |
| First delivery to Qantas | October 2026 | On schedule (per Airbus) |
| SYD ↔ LHR commercial launch | March 2027 | On schedule (per Qantas) |
| SYD ↔ JFK commercial launch | From 2028 | Pending remaining 11 frames |
| Total order book | 12 aircraft | Firm |
The 238-seat Project Sunrise configuration — 6 first-class suites, 52 business with sliding doors, 40 premium-economy, 140 economy — is the lowest seat count of any A350-1000 in airline service. Qantas deliberately accepted that revenue-density penalty because the 17,016-km Sydney-London great-circle route does not work commercially at the 300+ seats a standard A350-1000 would carry.
Passenger experience on 18+ hour flights
Eighteen hours airborne changes the in-flight product in three concrete ways. Crew rests require dedicated overhead bunk modules that take floor area away from revenue seating; the SIA ULR has two of these modules taking up the rear of the aircraft. Catering load doubles or triples relative to a 7-hour transatlantic flight, because the airline serves two full meals plus a continuous snack service and stocks for two distinct circadian phases of passenger appetite. Fuel reserves under FAA and EASA ULR rules require an additional 60–90 minutes of holding fuel for arrival diversion, on top of the standard 30 minutes — another constraint on take-off weight.