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SEA–LHR fares show a $258 median over the last 30 days; most cluster near $247–$320, with occasional spikes to $386.
Written from this route's 30-day price index (30 daily samples). Article last regenerated Nov 7, 2026.
See full numbers and stats on the SEA → LHR price history page.
Over the last 30 days, every day had a cached fare for Seattle to London, giving a full picture of recent pricing. The median sat at $258, but the middle half of fares ranged from $247 to $320 — a 60% spread between the $241 low and $386 high. That's a wide enough range to suggest timing and flexibility both matter here, rather than a route with tightly clustered, predictable pricing.
The data doesn't include booking-date-to-departure-date timing, so we can't say definitively when within a booking horizon prices soften. What it does show is that fares below $250 are achievable and occurred often enough to anchor the bottom quartile, while the $320+ fares that make up the top quarter likely reflect premium dates, sold-out lower fare buckets, or less flexible search windows. Treat $258 as a realistic median target and anything near or below $247 as a good deal worth booking quickly.
No single carrier or day-of-week pattern is visible in this dataset, so we can't point to a specific airline's pricing behavior or claim certain departure days are cheaper — doing so would be guessing. The honest takeaway is that this route carries meaningful price variability (60% spread is substantial), so shoppers should compare multiple dates within their travel window rather than assuming any one day will reliably beat the median. The caveat: this is cached fare data over a single 30-day stretch, not a forward-looking forecast, so seasonal shifts or fare sales outside this window aren't captured.
Why we regenerated this article: Median fare ↓ 15% ($302 → $258). We only rewrite when the underlying price index actually moves — stable weeks keep the previous take.
AI-authored from this route's 30-day price index. Article last regenerated Nov 7, 2026. Fares shift continuously — confirm at booking.