Which flights are the bumpiest in the world? We analyzed turbulence data across 13,000+ routes — covering PIREPs (pilot reports), SIGMET weather alerts, and historical EDR measurements — to rank the most turbulent flight routes of 2026.
Our turbulence scores are based on three data sources: (1) PIREP (Pilot Reports) — real-time turbulence intensity reports filed by pilots via FAA/NOAA systems, updated every 15 minutes. (2) SIGMET alerts — official severe turbulence warnings issued by international aviation meteorological services. (3) Historical EDR (Eddy Dissipation Rate) data — the aviation industry's standard metric for turbulence intensity, where 0.1–0.2 EDR = Light, 0.2–0.4 = Moderate, 0.4–0.7 = Severe. Each route is scored 1–10 and classified as Smooth, Light, Light-to-Moderate, Moderate, or Severe. Only routes with sufficient historical data are included in this ranking.
The routes below consistently rank as the most turbulent in our global database. Mountain routes top the list — particularly over the Andes and Rockies — followed by transatlantic winter routes where the polar jet stream reaches maximum intensity. The North Atlantic and North Pacific corridors are notably rough in winter (December–March), while Southeast Asian and Caribbean routes peak in summer monsoon season (June–September). **1. Santiago (SCL) → Mendoza (MDZ)** — The Andes crossing is the world's most reliably turbulent short route. Mountain wave turbulence is virtually guaranteed, with moderate-to-severe conditions on 60–70% of flights. The Andes here rise to 6,900m (22,600 ft), forcing aircraft to navigate through or over intense orographic turbulence. Best seats: center of the aircraft, rows 15–25. **2. Denver (DEN) → East Coast** — Routes crossing the Rocky Mountains from Denver to cities like Chicago, New York, Atlanta or Miami regularly encounter mountain wave turbulence during descent and ascent. Winter months are worst. Expect 20–40 minutes of moderate turbulence. **3. North Atlantic (Winter)** — Transatlantic routes including London–New York (LHR–JFK), Frankfurt–Chicago (FRA–ORD), and Paris–Los Angeles (CDG–LAX) are at their worst December through March, when the polar jet stream shifts south and strengthens. Turbulence typically occurs for 1–3 hours of the 7–9 hour flight. **4. North Pacific** — Los Angeles–Tokyo (LAX–NRT), San Francisco–Tokyo (SFO–NRT), and Seattle–Seoul (SEA–ICN) cross the North Pacific jet stream. Winter routes can encounter severe clear-air turbulence at cruising altitude. The jet stream here can reach 200+ mph wind speeds. **5. Mumbai–Tokyo (BOM–NRT)** — This Asia-crossing route traverses multiple frontal systems and the Himalayas' downstream turbulence. Rated the most turbulent long-haul Asia route in our database, with moderate conditions on average year-round. **6. London–Oslo / London–Helsinki** — Short northern European routes that consistently show higher turbulence than other EU hops, due to the proximity of the North Sea frontal systems and Scandinavian terrain. **7. Caribbean routes (Summer)** — June through September, the ITCZ (Intertropical Convergence Zone) brings convective turbulence to Caribbean routes. Flights from New York, Miami or London to Jamaica, Barbados or Punta Cana are bumpiest at this time. Afternoon departures are typically rougher than early morning.
For context, the world's smoothest long-haul routes include: Dubai–Male (DXB–MLE), Dubai–Seychelles (DXB–SEZ), Singapore–Bali (SIN–DPS), and Doha–Mauritius. These routes fly over warm, stable tropical oceans with minimal frontal activity. Turbulence scores on these routes average 1.5–2.0 out of 10.
You can't avoid turbulence entirely, but you can reduce exposure: (1) **Choose morning flights** — thermal turbulence from surface heating is lowest before noon. (2) **Pick a center seat over the wings** — the wing area (typically rows 10–25 on a 737) experiences the least vertical movement. (3) **Avoid mountain crossings in winter** — if your route crosses the Rockies, Andes or Alps, book summer travel when mountain wave intensity is lower. (4) **Check before you fly** — turbulence-forecast.com shows expected turbulence for your specific route with seasonal charts and seat recommendations. (5) **Keep your seatbelt on** — serious turbulence injuries happen almost exclusively to unbelted passengers.
Research published in Nature (2023) found that clear-air turbulence (CAT) over the North Atlantic has increased by 55% since 1979, with severe CAT increasing by 188%. The mechanism: a warming Arctic reduces the temperature gradient between poles and equator, causing the polar jet stream to become more erratic and shift position unpredictably. This makes turbulence harder to forecast. The most affected routes are transatlantic (London–New York, Paris–Chicago) and North Pacific (Los Angeles–Tokyo). The trend is projected to continue through 2050.
Ranked by historical turbulence score — click any route for details