When is the Washington DC to Sapporo route most turbulent?

Check the monthly chart for exact patterns. Transatlantic and mountain routes are typically roughest in winter (Dec–Mar). Tropical routes peak during monsoon season.

IAD to CTS Turbulence Forecast

Q: Is the Washington DC to Sapporo flight turbulent?

The IAD–CTS route typically experiences light turbulence.

Q: Which seat is smoothest on IAD to CTS?

Wing seats are smoothest. On a Boeing 777 · Airbus A350, that's rows 20–38. Avoid the rear of the aircraft.

Q: How long is the flight from IAD to CTS?

The IAD to CTS flight takes approximately 12h 35m, covering 6,281 miles at 37,000 feet.

Is the Washington DC to Sapporo flight turbulent? Live forecast & historical patterns.

Live forecast

IAD

→

CTS

Washington DC · Sapporo · 12h 35m

33.4

Turb Score

12h 35m

Duration

5,458 nm

Distance

37,000 ft

Cruise Alt.

Light

Typical

⚠️ Light turbulence today

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Typical turbulence along the route

Historical average pattern for IAD–CTS

0h1h2h3h4h5h6h12h 35m

Smooth

Light

Moderate

Heavy

About the IAD–CTS route

The Washington DC to Sapporo route spans the Pacific Ocean — one of the longest commercial flight paths in the world at 6,281 miles. The Pacific jet stream creates moderate turbulence, typically around 3–7 hours into the flight. The sheer length of the route means passengers experience varying conditions: calm stretches punctuated by bumpy patches.

The route is served by United, American Airlines, Delta on Boeing 777 · Airbus A350 aircraft, with flights typically cruising at 37,000 feet over a distance of 6,281 miles (5,458 nautical miles).

💡 Tip: Long flight — turbulence varies throughout. Wing seats significantly reduce motion.

Washington DC to Sapporo Flight Time

How long is the flight from IAD to CTS?

12h 35m

Flight Time

6,281 mi

Distance

37,000 ft

Cruising Altitude

Boeing 777

Aircraft

The Washington DC (IAD) to Sapporo (CTS) flight takes approximately 12h 35m, covering 6,281 miles (5,458 nautical miles) at 37,000 feet. The route is operated by United, American Airlines, Delta. Return flights (CTS to IAD) take a similar time, though westbound transatlantic and transpacific routes are typically 30–60 minutes longer due to headwinds.

Turbulence levels on IAD–CTS

What to expect at each phase of the flight

SmoothDeparture & arrival — climb and descent phases are generally calm

LightMinor bumps — drink stays in your cup, walking feels slightly unsteady

ModerateNoticeable bumps — stay seated with seatbelt on, service may pause

HeavyStrong jolts — unsecured items move, crew seated. Rare but possible

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Best time to fly IAD–CTS

Turbulence by month

Smooth

Light

Moderate

Rough

Best seat on IAD–CTS

Boeing 777

Front

Rows 1–19

Light

✓ Wing

Rows 20–38

Smoothest

Rear

Rows 39+

Rougher

Wing seats are over the center of gravity — least affected by turbulence.

What you'll see in the app

Full forecast, live map & seat recommendations

Similar routes

Other popular routes with turbulence data

IAD → LHR

Washington DC → London

Moderate

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Washington DC → Frankfurt

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Global turbulence outlook

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Passenger Reports

There was some noticeable movement over the Pacific that made me grip the armrest. My seatmate (clearly a regular) didn't even look up from their book. Perspective.

First-time flyer · April

Kids barely noticed the turbulence — just some mild bumps crossing the dateline. Seatbelt sign was on and off a couple times. Nothing dramatic.

Parent traveling with kids · August

Some light chop mid-Pacific — seatbelt sign came on for maybe 20 minutes but nothing to worry about. Typical for this route in January.

Regular traveler · January

All IAD routes→ All CTS routes→

Frequently asked questions

Is the Washington DC to Sapporo flight turbulent?

The IAD–CTS route typically experiences light turbulence. The turbulence score for this route is 33.4/100.

When is turbulence worst on IAD to CTS?

Long flight — turbulence varies throughout. Wing seats significantly reduce motion. Check the turbulence chart above for the typical pattern along this specific route.

Which seat is smoothest on IAD to CTS?

Wing seats are always the smoothest. On a Boeing 777 (the most common aircraft on this route), that's rows 20–38. Avoid the very rear of the aircraft — it amplifies turbulence motion.

How long is the flight from IAD to CTS?

The IAD to CTS flight takes approximately 12h 35m, covering 6,281 miles (5,458 nautical miles).

Which airlines fly IAD to CTS?

The main airlines operating this route are United, American Airlines, Delta, flying Boeing 777 · Airbus A350 aircraft.

Data Sources

PIREP — Pilot reports (PIREPs) submitted via FAA/ICAO systems, aggregated over 12+ months of historical data
SIGMET / AIRMET — Significant Meteorological Information bulletins from NOAA Aviation Weather Center
EDR data — Eddy Dissipation Rate measurements from commercial aircraft (ADS-B derived turbulence intensity)
Seasonal patterns — 5-year rolling averages of turbulence frequency and intensity by month for this route

Scores represent typical conditions. Actual turbulence varies daily. For real-time forecasts, use the Turbulence Forecast app. · About our data