Washington → Madrid flights

Budget $349 for IAD–MAD — prices cluster tightly in a narrow band

Key takeaways

• The median fare is $349, and both the 25th and 75th percentiles land at the same number — meaning the majority of sampled fares hit exactly that price point.
• The floor observed was $294 — roughly 16% below median — so cheaper fares do surface, but infrequently across this sample.
• The ceiling was $363, only $14 above median, suggesting upward price spikes on this route are modest rather than dramatic.
• Spread is 23% (low-to-high), which sounds meaningful, but the tight p25–p75 band tells us the $294 low is an outlier, not a reliable target.
• With only 11 daily snapshots, treat these figures as directional rather than definitive — a larger sample may reveal more variability.

30-day price trend

See full numbers and stats on the IAD → MAD price history page.

The full picture

Washington Dulles to Madrid fares in this dataset are strikingly compressed. Both the 25th and 75th percentile sit at exactly $349, which means at least half of all observed fares landed on that single number. The overall spread of 23% is driven almost entirely by one low observation at $294 — an outlier worth watching for but not worth building your travel budget around. For practical planning, $349 should be your mental anchor.

Because the price ceiling sits at just $363, there's little evidence that waiting to book punishes you severely with dramatic fare increases on this route — at least within the observed window. Conversely, the rare $294 fare suggests that occasionally seats are released at a meaningful discount, possibly during off-peak demand periods or as promotional inventory. If your travel dates are flexible, setting a fare alert around $310–$320 is a reasonable strategy without expecting it to trigger frequently.

Carrier-level patterns aren't distinguishable from this dataset, so route-level guidance is the limit of what the data supports. The honest caveat here is the sample size: 11 snapshots is a thin basis for confident booking-window conclusions. Seasonal demand shifts — summer travel to Madrid peaks sharply — can move fares well outside this range in either direction. Use $349 as a credible reference point, but revisit live pricing if your departure is more than six to eight weeks out.

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