Dulles to Singapore
19h 43mgate to gate
The flight from Washington Dulles International Airport (IAD) to Singapore Changi Airport (SIN) covers 15,532 km (9,651 miles) and takes approximately 19h 43m gate to gate for a typical jet.
The route heads north on an initial great-circle bearing of 358°, passing near 71.1° N, 109.1° E at its midpoint.
Bearing 358° north Midpoint 71.1° N, 109.1° E Model 805 km/h + 25 min
SOURCE·OurAirports + great-circle computation·REVIEWED JUL 2026
How this is worked out
- Take both airports' published coordinates from OurAirports — nothing here is scraped from another flight site.
- Great-circle distance by haversine on a mean earth radius of 6,371.0088 km: 15,532 km.
- Airborne time = that distance ÷ 805 km/h, a representative jet cruise speed: 19h 18m.
- Add a flat 25 minutes for pushback, taxi, climb, descent and taxi-in — the reason a 400 km hop is never half an hour: 19h 43m gate to gate.
- Winds, aircraft type and airline schedule padding are not modelled. The cruise-speed table shows how much that assumption is worth.
15,532 km / 805 km/h = 19h 18m airborne
+ 25 min ground = 19h 43m gate to gate
SOURCE·OurAirports + great-circle computation·REVIEWED JUL 2026
The same route, plotted on a world grid
The strip above gives the route its length and its shape. This gives it a position: latitude and longitude only, no coastlines, because a hand-drawn coastline would be decoration pretending to be data. On a flat grid the shortest path looks bent; on a globe it is straight.
Flight time at different cruise speeds
Aircraft type, winds and routing all move the real number. This is the same distance flown at different speeds, plus the 25-minute ground and climb allowance.
| Typical of | Cruise speed | Airborne | Gate to gate |
|---|---|---|---|
| Turboprop / regional | 550 km/h | 28h 14m | 28h 40m |
| Narrowbody jet (A320, 737) | 780 km/h | 19h 55m | 20h 20m |
| Widebody jet (777, 787, A350) | 900 km/h | 17h 15m | 17h 41m |
| Private jet (Gulfstream) | 850 km/h | 18h 16m | 18h 42m |
Headwinds on an eastbound long-haul routinely add 30–60 minutes; the same route westbound can be quicker. Airlines publish schedules with padding built in.
SOURCE·OurAirports + great-circle computation·REVIEWED JUL 2026
Both airports
| IAD | SIN | |
|---|---|---|
| Airport | Washington Dulles International Airport | Singapore Changi Airport |
| City | Dulles | Singapore |
| Country | United States | Singapore |
| ICAO | KIAD | WSSS |
| Coordinates | 38.9445, -77.4558 | 1.3502, 103.994 |
| Elevation | 312 ft | 22 ft |
Every figure on this plate is geometry. The shape of the earth is knowable; the airline's schedule is not.
Questions this plate answers
How long is the flight from Dulles to Singapore?
A non-stop flight from Dulles (IAD) to Singapore (SIN) takes about 19h 43m. The great-circle distance is 15,532 km (9,651 miles, 8,387 nautical miles), flying north on an initial bearing of 358°.
How far is Dulles from Singapore?
15,532 kilometres in a straight line over the earth's surface — 9,651 miles or 8,387 nautical miles. Actual flown distance is usually 2–5% longer because aircraft follow airways, avoid weather and route around restricted airspace.
Is there a non-stop flight between IAD and SIN?
This page calculates the direct-line time and distance; it does not track airline schedules. At 15,532 km the route is at the extreme end of what any airliner can fly non-stop, so a connection is likely. Check an airline or booking site for what is actually scheduled.
What should I expect on a 19h 43m flight?
Anything past six hours is a long-haul flight: expect at least one meal service, a significant time-zone shift, and enough sitting that circulation and hydration start to matter. Cabin altitude, dry air and disrupted sleep do more damage to a training routine than the flight itself.
Airport coordinates from OurAirports (public domain). Distance is a great-circle calculation; flight time uses the model described on the method page. Flight times are great-circle estimates for planning only — always check the airline's published schedule.
