Boston → San Juan flights
Boston to San Juan flights show a narrow $132–$147 range across 30 snapshots, with a median of $143; book when fares dip to the $139 p25 mark.
BOS→SJU fares cluster tightly — target $139–$143
Key takeaways
- Median fare is $143, based on 30 daily snapshots of the cheapest cached fares on this route.
- The full observed range is just $15 ($132 low to $147 high), signaling a stable, competitive pricing environment.
- Bottom-quartile fares sit at $139 or below — that's a realistic target, not a rare flash sale.
- Spread is only 11%, well under the 15% threshold where timing the market meaningfully pays off.
- The $132 floor does exist, but it's the exception; don't hold out for it when $139 is attainable.
30-day price trend
See full numbers and stats on the BOS → SJU price history page.
The full picture
Boston to San Juan is one of the more predictably priced routes in the Northeast–Caribbean corridor. Across 30 daily snapshots, the cheapest available fares ranged from $132 to $147 — a spread of just 11%. That's a remarkably compressed band, and it carries a clear practical implication: the decision of *when* to book matters far less here than it does on more volatile routes. You're unlikely to lose or gain more than a few dollars by timing your purchase differently within a normal booking window.
The median of $143 and the 25th-percentile figure of $139 are close enough together that $139–$143 is the honest target range for this route. If you see a fare at or below $139, that represents bottom-quartile pricing and is worth locking in. The $132 low is real but sits outside the typical distribution — treating it as the baseline expectation would likely mean waiting longer than the savings justify. The p75 of $146 confirms that even the pricier end of the range stays reasonable, so there's no evidence of dramatic late-booking surges in this data window.
Because the spread is this narrow, carrier mix and departure-day patterns would need to show a meaningful price gap to be actionable — and this dataset doesn't surface that level of granularity. The honest takeaway is straightforward: monitor fares until you see $139 or below, book with confidence at $143 if the timing suits your schedule, and don't over-engineer the decision chasing a $132 outlier. One caveat worth keeping in mind: this data reflects a specific 30-day snapshot window and may not capture seasonal demand spikes — particularly around winter holidays and spring break, when San Juan fares from Boston can behave differently.
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AI-authored from this route's 30-day price index. Article last regenerated Aug 1, 2026. Fares shift continuously — confirm at booking.