Seattle → Washington flights

Seattle–DC fares cluster near $207, but a $303 high lurks

Key takeaways

• $207 median fare across 12 snapshots, with a floor of $196
• Bottom quartile sits right at the median ($207), meaning a large share of fares cluster near the low end
• Top quartile jumps to $263, and the high snapshot hit $303 — a 55% spread between low and high
• That spread is wide enough to matter: locking in near the $196–$207 range looks meaningfully better than waiting
• Only 12 days of snapshots here, so treat this as a directional read rather than a precise forecast

30-day price trend

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

The full picture

The data shows a fairly wide 55% spread between the $196 low and $303 high on this Seattle–Washington route, but the distribution isn't evenly spread — the p25 figure sits right at the $207 median, meaning a good chunk of observed fares bunch up near the lower end. The $263 p75 and $303 high appear to be less common outliers rather than the norm, which is a useful signal: most of the time, fares on this route look like they're in the high-$190s to low-$200s range.

With only 12 snapshots, we can't make strong claims about a specific booking window within the calendar — there isn't enough data here to say prices soften at a particular number of weeks out. What we can say is that the gap between the median and the high fare is large enough to justify shopping around rather than booking the first price you see. If you spot something at or near $207, that's consistent with the bulk of the data; anything pushing past $260 looks like it's drifting into the route's pricier tier.

No dominant carrier was identifiable in this dataset, so we can't speak to airline-specific patterns or whether certain carriers consistently undercut others on this route. Similarly, with just 12 days of snapshots, we don't have enough signal to comment on day-of-week effects — that would require a larger sample to say anything credible. The honest takeaway: this is a route with real price variability, where patience and comparison shopping around the $200–$210 mark seem to pay off, but the thin sample size means this snapshot should be treated as a rough guide rather than a precise rule.

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