Washington → Lisbon flights

Median fare $391, but prices can spike past $865 — book early

Key takeaways

• Median fare of $391 sits at the floor of observed prices — the bottom quartile (p25) is also $391
• Top quartile jumps to $830, meaning a meaningful share of snapshots were more than double the median
• Spread of 121% between low and high is very wide — this route shows real pricing volatility, not a stable fare
• High of $865 suggests late or peak-demand searches can cost over twice the typical fare
• Only 9 daily snapshots sampled — a thin dataset, so treat these patterns as directional, not definitive

30-day price trend

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

The full picture

The data shows a stark split in pricing for Washington (DCA) to Lisbon (LIS): a median fare of $391 that matches the 25th percentile, alongside a 75th percentile of $830 and a high of $865. This isn't a market with gentle day-to-day drift — it's one where a large share of snapshots cluster near the low end while another chunk sits more than double that price. A 121% spread confirms this is a high-volatility route, likely reflecting a mix of fare classes, booking windows, or demand spikes rather than steady appreciation over time.

With prices this bifurcated, the practical takeaway is to treat the $391 median as an achievable target rather than a guarantee. Fares bunching at the low end alongside a smaller cluster near $830-$865 typically points to limited-availability discount fares selling out, after which remaining inventory jumps sharply. Booking as early as possible in the planning window — rather than waiting — gives you the best shot at catching a fare near the median before it's gone. Once the cheaper fare buckets are exhausted, the remaining options appear to cost more than twice as much, so there's little upside to waiting for a late-breaking discount on this route.

We don't have enough signal in this dataset to identify a reliable day-of-week pattern or a dominant carrier effect — the sample is too thin for that level of granularity. What the data does support is a general strategy: lock in a fare once you see something near $391-$400, because the alternative if you wait is a real chance of paying over $800. The honest caveat here is the sample size: only 9 snapshots were collected, which is enough to flag volatility but too few to make confident claims about timing within the booking window or specific weekday effects. Treat this as an early signal rather than a settled pattern, and revisit pricing as more data accumulates.

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• When to book
  Washington → Lisbon
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  Washington → Lisbon
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