Washington → Vienna flights

Typical fares sit near $415 — but outliers can spike to $3,047

Key takeaways

• Median fare of $415 across the 11-day sample is a reasonable budget target.
• Bottom quartile sits at just $387, nearly identical to the 75th percentile ($415) — most normal fares are tightly banded.
• High outlier of $3,047 skews the range dramatically; this is almost certainly a business/first-class or error fare, not representative of typical pricing.
• Spread of 687% looks extreme, but that's driven entirely by the one high outlier — day-to-day economy pricing looks stable.
• Only 11 snapshots were sampled, so treat these numbers as a useful signal, not a statistically robust trend.

30-day price trend

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

The full picture

The data shows two very different stories depending on which number you look at. Most snapshots cluster tightly between $387 and $415 — a narrow band that suggests economy fares on this route are fairly stable day to day. But the $3,047 high — more than seven times the median — is clearly an outlier, likely a premium cabin fare or a data anomaly, and it inflates the headline spread percentage to a misleading 687%. If you ignore that one extreme value, this route actually looks like a predictable, low-drama market: book whenever and expect to pay close to $400.

With only 11 daily snapshots, we can't make confident claims about a booking window where prices typically soften — that kind of pattern requires a longer time series to detect reliably. What we can say is that the bulk of observed fares (the 25th to 75th percentile range) spans just $387 to $415, a gap of under 10%, which is unusually tight. That consistency is itself useful: it implies this route doesn't reward aggressive last-minute hunting or early-bird timing nearly as much as routes with wider typical spreads.

No dominant carrier or weekly pattern is visible in the data provided, so we can't speak to day-of-week effects or airline-specific fare behavior here. The honest caveat: with a sample size this small (11 days) and one dramatic outlier skewing the range statistics, treat the $415 median as your best planning anchor, but don't read too much into the spread percentage itself — it's an artifact of a single high fare, not evidence of a volatile market.

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