Seattle → Reykjavík flights

Target $375–$378 on SEA–KEF — and watch for dips to $312

Key takeaways

• Median fare is $378, making anything at or below that a solid benchmark to act on.
• The bottom quartile sits at $375 — barely below median — meaning genuinely cheap fares cluster tightly, not broadly.
• The floor of $312 appears occasionally but is an outlier; budget for $375–$435 as a realistic range.
• A 54% spread (low $312 to high $480) is wide enough that timing and flexibility materially affect what you pay.
• The top quartile reaches $435, so waiting too long risks paying ~15% above the median with no obvious upside.

30-day price trend

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

The full picture

Seattle to Reykjavik is a long-haul transatlantic route with limited nonstop options, and that scarcity shows in the numbers. Over 28 daily snapshots, the cheapest available fares ranged from $312 to $480 — a 54% spread that is meaningfully wide. However, the interquartile range tells a more nuanced story: the middle half of fares sits between $375 and $435, a corridor of only $60. That compression means the market isn't wildly volatile day to day, but the outlier low of $312 confirms that genuinely discounted inventory does surface — it just doesn't stick around long.

The practical implication for booking timing: because the p25 ($375) is almost indistinguishable from the median ($378), there is no obvious 'cheap window' baked into the distribution. Instead, the $312 floor suggests that occasional flash sales or unadvertised fare drops do occur — likely tied to seat availability rather than a predictable calendar pattern. Monitoring fares over a two-to-three week window and being ready to book quickly when prices dip meaningfully below $375 is a more reliable strategy than waiting for a specific day of week or booking horizon.

Carrier data was not available in this dataset, so route-specific airline behavior cannot be confirmed here. Reykjavik routes from the U.S. West Coast have historically attracted capacity from Icelandic and European carriers, which can introduce periodic pricing competition — but that is structural context, not a finding from this data. One honest caveat: 28 samples is a reasonable but not deep dataset. If travel dates shift seasonally (peak summer vs. shoulder season), the distribution above could look materially different, and these benchmarks should be re-checked closer to your intended travel window.

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