Latest news, Mar 22, 2026: Read all about a bunch of new features, including overseas-flight forecasts, in the latest BumpySkies newsletter.

UAL939, GLL to SFO, departing 4:39 PM BST, Mar 30

Turbulence forecast map for UAL939, GLL to SFO

Report an issue

(Forecast data last collected at 11:00 AM BST on Mar 30, 2026.)

Preliminary forecast. Check back within an hour or two of takeoff to see the most accurate route map and turbulence forecast for this flight.

  1. Takeoff from GLL at 4:39 PM BST, Mar 30.
  2. 4:40 PM BST: Light turbulence likely for the next 1 hour and 15 minutes.
  3. 5:55 PM BST: Calm skies for the next 27 minutes.
  4. 6:22 PM BST: Light turbulence likely for the next 25 minutes.
  5. 6:47 PM BST: Calm skies for the next 11 minutes.
  6. 6:58 PM BST: Light turbulence likely for the next 49 minutes.
  7. 7:47 PM BST: Moderate turbulence likely for the next 9 minutes.
  8. 7:56 PM BST: Light turbulence likely for the next 17 minutes.
  9. 8:13 PM BST: Calm skies for the next 2 hours and 15 minutes.
  10. 10:28 PM BST: Light turbulence likely for the next 2 hours and 10 minutes.
  11. 12:38 AM BST: Calm skies for the next 25 minutes.
  12. 1:03 AM BST: Light turbulence likely for the next 1 hour and 19 minutes.
  13. 2:22 AM BST: Calm skies for the next 17 minutes.
  14. 2:39 AM BST: Light turbulence likely for the next 34 minutes.
  15. 3:13 AM BST: Calm skies for the rest of the flight.
  16. Landing at SFO at 3:18 AM BST.
Nelly

Nelly says: Bumpy skies can be scary, but they're not dangerous!

See our turbulence safety page for more information, including links to other resources for nervous fliers.

📣 To stay informed about updates to BumpySkies, subscribe to the free newsletter:

You can also browse past newsletter issues.

BumpySkies is a free service that depends on your donations to stay online.

If you find this service helpful, please consider supporting BumpySkies on Patreon.

For best results, try it shortly before departure.

(Or, see a random upcoming flight's forecast.)