How long is flight AY15?

The HEL to JFK route is the basis for the schedule. View the full route forecast and typical duration on the Turbcast route page.

Flight AY15

AY15 Turbulence ForecastFinnair · HEL → JFK

About flight AY15

Airline: Finnair (AY)
Route: HEL → JFK
Typical Aircraft: A359
Distance: 6,607 km
Duration: 8h 11m
Cruise Altitude: FL390

See today’s turbulence forecast

Finnair AY15 flies the jet-stream + mountain-wave corridor from Helsinki to New York. Conditions change hour to hour - view the live forecast for your departure date.

View live forecast

Check AY15 on a specific date

Turbulence on the HEL → JFK route

Jet-stream exposure on this corridor is significant. Long mid-latitude legs mean clear-air turbulence is the dominant source of bumps, typically encountered at cruise altitude. The route crosses or passes near the Greenland ice cap, which can generate mountain-wave turbulence downwind when upper-level winds are strong. Westbound aircraft typically fly against the prevailing winds, adding flight time. Captains often pick altitudes that avoid the strongest headwinds, which can also mean picking cleaner-air altitudes.

Calmest season: Late spring to early autumn (May-September). The oceanic track sees its strongest jet-stream activity in the northern winter (Nov-Mar), when winds aloft are fastest and clear-air turbulence is more frequent. Wind flowing over the Greenland ice cap can generate mountain-wave turbulence that extends hundreds of kilometres downwind - most pronounced in the northern winter (Nov-Mar), when upper-level winds are strongest.

Full HEL to JFK route guide

Frequently asked questions

Is AY15 usually a bumpy flight?

Finnair AY15 operates between HEL and JFK. Whether it’s bumpy depends on the day’s weather - Turbcast pulls live NOAA aviation-grade data so you can check the actual forecast for your departure date rather than relying on averages.

What aircraft does AY15 use?

AY15 is typically operated by the A359. Aircraft swaps happen - confirm with your booking before flying.

How long is the HEL to JFK flight?

Approximately 8h 11m direct, covering 6,607 km at a typical cruise of FL390.

When does AY15 have the smoothest weather?

Historically calmest during Late spring to early autumn (May-September). Forecast accuracy improves as you get closer to departure - within 48 hours the NOAA WAFS model is at peak skill.