Boston → San Juan flights
BOS–SJU fares run a $162 median over 30 days, with the bulk between $157–$179; occasional spikes to $298 look like outliers.
Median fare $162 — most fares cluster $157–$179
Key takeaways
- Median fare is $162, and the bottom quartile (25th percentile) sits at just $157 — a tight cluster of cheap fares.
- The 75th percentile is $179, meaning three-quarters of observed fares stayed under $179.
- The $298 high is a clear outlier — well above the $157–$179 band where most fares actually land.
- Spread of 106% looks dramatic, but it's driven by a small number of high-fare days, not a consistently volatile market.
- With 30 daily snapshots, this is a solid sample size, giving reasonable confidence in the $157–$179 range as the norm.
30-day price trend
See full numbers and stats on the BOS → SJU price history page.
The full picture
The data shows a route that's cheaper and more stable than the raw spread number suggests. With a median of $162 and 50% of fares falling between $157 and $179, the everyday price for BOS–SJU is a fairly narrow band. The $298 high is real, but it's an outlier relative to the tight interquartile range — the kind of one-off spike you'd expect from a handful of high-demand or last-minute snapshots rather than a broad pricing trend.
We don't have enough granularity in this dataset to identify a specific booking window where prices reliably soften — that requires tracking fares against actual travel dates over time, which isn't part of these 30 daily snapshots. What we can say is that the bulk of observed fares sit close to the median, so travelers monitoring this route should treat anything at or below $162 as a solid deal, and anything approaching $200+ as a likely outlier worth waiting on or comparing against alternate dates.
No carrier information was distinguishable in this data, so we can't speak to airline-specific pricing patterns or whether one carrier is driving the high-end spikes. The honest takeaway: this route shows a fairly tight, predictable core price range with occasional high outliers, but with only 30 days of snapshots and no visibility into how fares move relative to departure date, we can't responsibly claim a specific 'best time to book' within the booking horizon — only that $157–$179 is where the market has been sitting most days.
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Related travel pages
Why we regenerated this article: Median fare ↑ 11% ($146 → $162). We only rewrite when the underlying price index actually moves — stable weeks keep the previous take.
AI-authored from this route's 30-day price index. Article last regenerated Sep 19, 2026. Fares shift continuously — confirm at booking.