SEA to LHR upgrade odds
Seattle (Seattle-Tacoma International Airport) to London (London Heathrow Airport) on Alaska and Delta. Run a free search and every flight on this route is ranked by your real odds of clearing the upgrade list for your status — a calibrated probability with honest error bars, never a bare number.
First search free, no account · then 3 more and a tracked trip with alerts · no card required
Who flies SEA to LHR nonstop
- Alaska: about 1 nonstop a day, 9:40 PM to 9:40 PM, typically Boeing 787, shortest 17h 25m.
- Delta: about 1 nonstop a day, 9:50 PM to 9:50 PM, typically A339, shortest 17h 45m.
One-stop options
- American has no nonstop here; a search checks its hubs (ORD, LGA, JFK) for one-stop options ranked by odds.
- United has no nonstop here; a search checks its hubs (ORD, DEN, EWR) for one-stop options ranked by odds.
Schedule facts from the next 60 days of published timetables (4 days observed). Upgrade odds are personal and live, so they are never printed here — run the search.
What the search shows you
Every Alaska and Delta departure on your date, side by side: schedule, aircraft, open premium seats against cabin size, fare, and the upgrade score — a probability with its range and a plain-English reason. The same route an hour earlier or later can differ by 30 points. Book the one that clears.
A 70% shot still misses 3 in 10. Every prediction is graded against the real gate outcome and the misses are published on the track record.