The North Atlantic is the busiest — and in winter, the bumpiest — ocean crossing in commercial aviation. Here's everything you need to know about turbulence on transatlantic routes.
The North Atlantic experiences high turbulence for one primary reason: the polar jet stream. This band of high-altitude winds (the 'river in the sky') flows from west to east at 150–250 mph, concentrated at 30,000–40,000 ft — exactly where transatlantic flights cruise. Where the jet stream's fast-moving core meets slower air masses at its edges, intense clear-air turbulence (CAT) forms. CAT is invisible — no clouds, no radar return. The only detection is through reports from aircraft already in the turbulence (PIREPs). In winter, the jet stream strengthens and shifts south, directly over the most trafficked North Atlantic tracks. This is why December–March flights are significantly rougher than summer crossings.
Transatlantic flights don't just fly random routes — they use the North Atlantic Track System (NAT), a series of organized routes updated twice daily by NATS (UK) and NAVCANADA. The tracks are designed to minimize flight time using the jet stream for eastbound flights and avoiding it for westbound flights. Despite this optimization, crossing the jet stream is often unavoidable. The most turbulent sections are typically 2–5 hours into westbound flights (flying against the stream) and sometimes 1–3 hours into eastbound flights (entering the jet stream core).
Ranked by historical turbulence score — click any route for details