Longest Flight in the World: Top Routes, Durations & Records

Singapore Airlines has held the title of world’s longest flight since 2021 with its New York-to-Singapore route—and by a distance, quite literally. The JFK–SIN run stretches roughly 15,349 km (9,542 miles), taking about 18 hours 50 minutes in the air on a specially configured A350-900ULR. But how you rank ultra-long-haul flights matters: the distance record sits in one corner, while duration records tell a slightly different story. Here’s how the rankings shake out heading into 2026.

Current Longest Flight: Singapore Airlines JFK-SIN, 18h 50m · Distance: 15,349 km · Upcoming Longest: Shanghai-Buenos Aires, 29h · Aircraft Used: A350-900ULR · Shortest Flight: 57 seconds

What is the longest flight of the world?

Strictly by great-circle distance, the answer is clear: New York (JFK) to Singapore (SIN), operated by Singapore Airlines. The route spans roughly 15,349 km (9,542 miles) using the Airbus A350-900ULR—a variant engineered specifically for this kind of endurance run.

Current record holder

The route operates as flights SQ23 (westbound) and SQ24 (eastbound), with eastbound trips averaging around 18 hours 40 minutes and westbound roughly 18 hours 50 minutes. According to OAG (Aviation Analytics), this has been the longest commercially bookable flight since 2021, when Singapore Airlines extended its existing Newark service to JFK—pushing past Qatar Airways’ Auckland–Doha route, which had held the title since 2017.

Route details

Singapore Airlines’ JFK–SIN uses the Airbus A350-900ULR, a special variant with modified fuel tank capacity and a passenger configuration optimized for ultra-long-haul endurance. The airline has gradually expanded capacity on this route, adding premium economy and adjusting cabin layouts to balance range requirements with passenger comfort.

Aircraft type

The A350-900ULR was designed from the ground up for ultra-long-haul missions like SIN–NY. Enhanced fuel tanks allow the aircraft to fly farther without refueling, while structural reinforcements handle the additional fuel weight. According to My Flight Routes (Aviation Data), the ULR variant carries fewer seats than a standard A350-900 to make room for that extra fuel load.

The A350-900ULR was specifically designed for this route, featuring modified fuel tanks and a reduced passenger capacity for extended range.

— My Flight Routes, Aviation Blog

What are the top 10 longest flight routes?

The honest answer depends on how you define “longest”—distance or duration. Most aviation databases sort by great-circle distance, but duration rankings tell a slightly different story because winds, payload, and routing all influence block times.

Ranked by distance

Based on OAG (Aviation Analytics) data, the top 10 routes by distance in 2025 look like this:

The pattern: Asia-Pacific to US/Europe routes dominate the longest routes due to polar great-circle efficiency, making Singapore’s hub position particularly advantageous for ultra-long-haul operations.

Ranked by duration

When sorted by scheduled block time, the picture shifts. AFAR (Travel Insights) notes that Xiamen Airlines’ JFK–Fuzhou route takes roughly 19 hours 20 minutes—longer than any other flight currently in operation by time—despite ranking lower on pure distance because the route covers “only” about 11,394 km. Wind patterns and routing mean the aircraft burns more fuel and spends more time aloft.

Airlines operating

Singapore Airlines dominates the top distance rankings with its SIN-JFK and SIN-EWR routes, both on A350-900ULR aircraft. Qantas operates two major entries: PER-LHR on Boeing 787-9 and MEL-DFW on the same type. Qatar Airways runs AKL-DOH on Boeing 777-200LRs (with a planned aircraft change on March 28, 2026, per AFAR (Travel Insights)), while Hainan Airlines and Philippine Airlines round out the Asia-Pacific to Americas connections.

Auckland-Doha was once the world’s longest non-stop commercial flight but now sits in a respectable third place.

— OAG, Aviation Analytics

Is there a 20 hour flight?

Yes—and depending on how you count, there are already flights that break the 18-hour barrier, with even longer routes on the horizon.

Existing 20+ hour routes

Currently, no non-stop scheduled passenger flight exceeds 20 hours, but several come close or exceed it with technical stops. Xiamen Airlines’ JFK–Fuzhou route operates at roughly 19 hours 20 minutes, the longest pure block time currently in operation according to AFAR (Travel Insights). Air Canada’s Delhi–Toronto run hits about 17 hours 5 minutes, while Qatar Airways’ DOH–LAX clocks in at roughly 17 hours 5 minutes on A350-1000s.

Upcoming longer flights

China Eastern Airlines launched Shanghai Pudong (PVG) to Buenos Aires (EZE) in December 2025, covering roughly 20,000 km with a stop in Auckland—totaling approximately 29 hours of travel time including the layover, as reported by Aerospace Global News (Aviation News). While not non-stop, this route represents the longest scheduled commercial connection by total travel time.

Qantas Project Sunrise aims to launch Sydney–London and Sydney–New York non-stop in 2027 using specially configured Airbus A350-1000s with wellness zones designed for flights exceeding 19 hours, per Aerospace Global News (Aviation News). If approved, those routes would extend the non-stop record to over 17,000 km.

What this means: for ultra-long-haul aviation, the next record won’t come from simply filling bigger tanks. It will come from lighter materials, more efficient engines, and clever route planning that squeezes every nautical mile from each kilogram of jet fuel.

Can a plane fly 20 hours straight?

In theory, yes—but commercially, it requires the right aircraft, the right route, and a willing airline.

Commercial plane limits

The Airbus A350-900ULR was designed for exactly this kind of mission. Its modified fuel tanks and reinforced wing structures allow it to sustain flights over 18 hours without refueling. The standard A350-900 can manage around 15,000 km range; the ULR variant pushes that to roughly 18,000 km—enough for SIN-JFK but not quite for SIN-New York on the eastbound leg without payload compromises.

The Boeing 787-9 commonly used on routes like PER-LHR and MEL-DFW offers solid efficiency for ultra-long-haul but maxes out around 14,500 km under typical payload conditions, according to OAG (Aviation Analytics). The 787-8 extended-range variant pushed further, but the 787-9 hit a sweet spot of efficiency and range that airlines preferred.

Refueling capabilities

Ultra-long-haul aircraft are designed to carry enough fuel for their intended routes, with regulatory reserves (typically 30 minutes for day operations, 45 minutes for night). The A350-900ULR’s maximum fuel capacity is roughly 141 tonnes compared to the standard A350-900’s 101 tonnes—about 40% more. Even so, the fuel weight itself becomes a limiting factor: the heavier the aircraft, the more fuel it burns, creating a diminishing-returns curve that constrains ultimate range.

Future ultra-long-haul flights like Qantas Project Sunrise will use A350-1000s with wellness zones—dedicated areas for movement, meals, and rest designed specifically for flights over 19 hours. These aren’t just about comfort; they’re about passenger health on routes where DVT risk and circadian disruption become real concerns.

How long can commercial planes fly without refueling?

The honest answer is: it depends on the aircraft, the route, and what the airline is willing to sacrifice in payload.

Range factors

Maximum range for modern commercial aircraft varies significantly: the Boeing 777-200LR holds the record at over 17,500 km, while the Airbus A350-900 maxes out around 15,000 km in standard configuration. The A350-900ULR pushes that to roughly 18,000 km, and Simple Flying (Aviation Publication) confirms Singapore Airlines retains the title for longest A350 routes through 2026.

Key range determinants include maximum takeoff weight (which includes fuel, passengers, and cargo), fuel efficiency at cruising altitude, wind patterns, and regulatory reserve requirements. The A350’s advanced aerodynamics and efficient engines (Rolls-Royce Trent XWB) give it an edge over older aircraft like the 777-200LR, but the 777-200LR’s proven long-range performance keeps it relevant on routes like DOH-AKL.

Record endurance

The theoretical maximum range doesn’t equal maximum practical endurance. Airlines balance fuel loads against passenger and cargo revenue—carrying extra fuel for “just in case” scenarios adds weight and burns more fuel. Most ultra-long-haul operations target a fuel load that gets the aircraft to destination with regulatory reserves intact, plus a small buffer for diversions.

For reference, Flightradar24 (Flight Tracking) tracks these routes in real-time and confirms the JFK-SIN route operates at or near its fuel capacity limits during typical operations.

Why this matters for travelers: the longest routes aren’t just marketing stunts—they represent the bleeding edge of what’s physically and economically possible. Each extra hour of range requires trade-offs in cabin density, payload, and operational complexity that airlines only accept when premium demand justifies the economics.

Top 10 longest flights: distance vs duration comparison

Three distance categories, one clear pattern: Asia-Pacific to US/Europe dominates the longest routes due to polar great-circle efficiency.

What this table shows: one flight ranks #1 by distance but #2 by duration, while another flips the order entirely. The discrepancy stems from wind patterns, routing, and payload—variables that don’t affect great-circle distance but do influence block time. Lists that claim a single “top 10 longest flights” without specifying distance vs duration are conflating two different metrics.

The implication: if you’re optimizing for shortest time in the air, follow duration rankings; if you’re measuring the physical challenge of aviation, distance rankings tell the real story. Singapore Airlines’ A350-900ULR routes own the distance crown, while Xiamen Airlines’ JFK-FOC run owns the endurance clock.

Shortest vs longest: the flight spectrum

Understanding the extremes helps contextualize where ultra-long-haul fits in aviation’s range spectrum. At the shortest end, Westray to Papa Westray in Scotland’s Orkney Islands takes just 57 seconds over 2.7 km—regularly scheduled service that beats any flight in duration by orders of magnitude. At the longest end, the JFK-SIN run stretches roughly 15,349 km over 18+ hours: a difference of roughly 5,700 times in distance and 1,100 times in duration.

The middle ground—routes between 4 and 8 hours—represents the bulk of commercial aviation, where aircraft optimization, fuel efficiency, and passenger comfort reach their practical sweet spots. Ultra-long-haul sits at one extreme end of that spectrum, where engineering constraints dominate operational decisions.

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Singapore Airlines’ SQ23 nonstop JFK-Changi route covers 15,356 km in under 19 hours, redefining commercial aviation endurance.

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