Seattle → Reykjavík flights

Seattle–Reykjavik: target $312–$375 and book early

Key takeaways

• Median fare is $375, based on 14 daily snapshots of the cheapest available cached fares.
• Bottom-quartile fares reach $312 (p25), meaning roughly a quarter of observed prices hit that floor — worth targeting.
• The spread is 41% (low $312, high $440), which is wide enough that timing your purchase meaningfully affects what you pay.
• $128 separates the cheapest and most expensive observed fares — equivalent to a night's accommodation in Reykjavik.
• Sample size is thin at 14 days, so treat these figures as directional rather than statistically definitive.

30-day price trend

See full numbers and stats on the SEA → KEF price history page.

The full picture

The $312–$440 range on Seattle–Reykjavik signals a route with genuine price volatility. A 41% spread is large by transatlantic standards, which means passive monitoring — setting a fare alert and waiting for a dip toward the $312–$340 zone — is a more defensible strategy than booking the first available price. The median of $375 sits at the p75 boundary, telling you that half of all observed fares were at or below $375 and a meaningful share came in well below that.

On a long-haul route like SEA–KEF, fares typically soften in two windows: roughly 3–5 months out, when airlines seed inventory with promotional pricing, and occasionally within 3 weeks of departure if load factors disappoint. The data here can't confirm which window is producing the low-end fares, but the existence of a p25 at $312 suggests promotional pricing does appear on this routing. If your travel dates are flexible, checking prices across a range of departure weeks rather than fixating on one date is likely to surface those lower fares.

No dominant carrier is distinguishable from this dataset, so routing and airline preferences should be secondary to price in your search. It's also worth noting that the 14-day sample is on the thin side — a full 30-day window would give more confidence in these percentiles. Use the $375 median as a credible reference point and treat anything at or below $340 as a strong signal to book, but stay alert to the possibility that conditions shift as the travel season changes.

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