Boston → San Juan flights
The median Boston–San Juan fare across 30 daily snapshots is $124, with bottom-quartile pricing at $121; fares can spike to $191, so booking ahead is the key lever.
BOS–SJU fares cluster near $124 — book early to stay in range
Key takeaways
- Median fare is $124, based on 30 daily snapshots of the cheapest available cached fares on this route.
- Bottom-quartile fares start at $121 (p25), meaning roughly one in four observed prices landed within $3 of the floor — the range is tight at the low end.
- The top of the range hits $191, a 59% spread from low to high, signaling meaningful upside risk if you wait too long.
- Half of all observed fares fell between $121 and $157 (p25–p75), so $157 is a reasonable 'still acceptable' ceiling before prices become outliers.
- The $120 floor is achievable but not guaranteed — it appeared in the data, but the clustering near $121–$124 suggests these fares are competitive rather than routine sale events.
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 affordable Caribbean routes out of the Northeast, and the data backs that up. With a median of $124 and a 25th-percentile price of $121, the bulk of competitive fares on this route are tightly packed at the low end — a $3 gap between the floor and the bottom quartile tells you that genuinely cheap tickets aren't unicorns here, but they do require some timing. The high of $191 represents a 59% premium over the low, which is a meaningful spread for a sub-$200 ticket and a clear signal that prices aren't static.
In general on leisure routes like BOS–SJU, fares tend to soften when you're booking 3–6 weeks out for non-peak travel, and they firm up sharply as the cabin fills during holiday windows, spring break, and summer. The tight clustering between $121 and $157 for the middle 50% of observations suggests this route has a relatively stable 'normal' pricing band — but the $191 high shows that demand spikes do push fares well outside that band. If you're targeting the $120s, booking as soon as your plans are confirmed is the most reliable strategy rather than waiting and hoping for a last-minute drop.
No dominant carrier pattern is identifiable from this dataset, so it's worth checking all major operators on the route rather than anchoring to one airline. The 30-day sample size is solid enough to trust the median, but fares on Caribbean routes can shift quickly around school calendars and weather events. Treat $157 as your mental ceiling — if you're seeing fares above that, it's worth waiting a few days to see if inventory resets, but don't hold out indefinitely expecting prices to return to $121.
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AI-authored from this route's 30-day price index. Article last regenerated Jun 13, 2026. Fares shift continuously — confirm at booking.