How Axel worksWhen to fly from Boston to San Juan (SJU)
Fares Axel saw Sep 21 – Oct 21, 2026 · 441 round trips over 80 departure dates · How Axel measures this
November 2026 was the cheapest month to fly Boston to San Juan (SJU) in the fares Axel saw Sep 21 – Oct 21, 2026: typically $310 round trip per adult across 19 departure dates, against $428 in December 2026. Christmas departures (Dec 18–25, 2026) ran 26% above the rest of the year, typically $451. That holiday drew 63% of Axel searches for this route.
Search live prices for your dates- Cheapest month
- November 2026Typically $310 round trip
- Priciest month
- December 2026Typically $428 round trip
- Lowest fare seen
- $267Nov 23 – Nov 26, 2026, seen Oct 21
- When people go
- ChristmasDec 18–25, 2026 · 63% of Axel searches for this route
Month by month
Typical round trip per adult, economy: the median of each departure date's cheapest round trip. Each month opens its live date picker.
- October 2026$341 →
5 dates priced · from $310 (Oct 30–Nov 6)
- November 2026$310 →
Cheapest month19 dates priced · from $267 (Nov 23–26) · 10% of searches
- December 2026$428 →
Priciest month23 dates priced · from $285 (Dec 4–11) · 70% of searches
- January 2027$420 →
4 dates priced · from $394 (Jan 9–17) · under 1% of searches
- February 2027$384 →
21 dates priced · from $331 (Feb 23–Mar 2) · 19% of searches
- March 2027$404 →
6 dates priced · from $387 (Mar 13–17) · under 1% of searches
- June 2027Live →
Too few dates for a typical fare · 2 dates priced · from $388 (Jun 5–12) · under 1% of searches
Holidays
Thanksgiving
−9% vs rest of yearLeaving Nov 20–26, 2026 · 8% of searches
Typically $325 round trip
Cheapest seen: $267, Nov 23–26 →Christmas
+26% vs rest of yearLeaving Dec 18–25, 2026 · 63% of searches
Typically $451 round trip
Cheapest seen: $387, Dec 25–29 →New Year's
+25% vs rest of yearLeaving Dec 26, 2026 – Jan 1, 2027 · 6% of searches
Typically $447 round trip
Cheapest seen: $428, Dec 28–Jan 2 →MLK weekend
Leaving Jan 14–18, 2027 · under 1% of searches
1 date priced
Cheapest seen: $449, Jan 15–18 →Presidents' Day weekend
+37% vs rest of yearLeaving Feb 11–15, 2027 · 15% of searches
Typically $491 round trip
Cheapest seen: $473, Feb 11–16 →Spring break
+13% vs rest of yearLeaving Mar 6–28, 2027 · under 1% of searches
Typically $404 round trip
Cheapest seen: $387, Mar 13–17 →
Cheapest dates Axel saw
- Nov 23 → Nov 26, 20263 nights · airline fare $281 · seen Oct 21$267Live price →
- Nov 3 → Nov 10, 20267 nights · airline fare $290 · seen Oct 21$275Live price →
- Nov 4 → Nov 11, 20267 nights · airline fare $295 · seen Oct 21$279Live price →
- Dec 4 → Dec 11, 20267 nights · airline fare $300 · seen Sep 24$285Live price →
- Nov 26 → Dec 2, 20266 nights · airline fare $305 · seen Oct 21$289Live price →
Questions travelers ask
What is the cheapest month to fly from Boston to San Juan (SJU)?
In the fares Axel saw Sep 21 – Oct 21, 2026, November 2026 was the cheapest, typically $310 round trip per adult. December 2026 was the most expensive, typically $428. Fares change daily; search your dates on Axel for live prices.
Is it more expensive to fly Boston to San Juan (SJU) at Christmas?
Christmas departures (Dec 18–25, 2026) ran 26% above the rest of the year, typically $451. That's from 8 Christmas departure dates Axel priced Sep 21 – Oct 21, 2026.
When do most people fly Boston to San Juan (SJU)?
Of the trips travelers searched on Axel for this route (Sep 21 – Oct 19, 2026), 63% were for Christmas (Dec 18–25, 2026) departures.
Are these live prices?
No. They are the lowest round-trip fares Axel's flight searches returned for Boston to San Juan (SJU) Sep 21 – Oct 21, 2026: economy, per adult, 2 to 21 nights. Open a month or a trip on this page for live prices on Axel.
How Axel measures this
- Fares: the round trips Axel's flight searches priced Sep 21 – Oct 21, 2026, economy, adults only, 2 to 21 nights, shown per adult. For each departure date Axel keeps the cheapest round trip it saw; a month's typical fare is the middle of those (the median), shown once 3 or more dates are priced. "Axel" is Axel's price; the airline fare is what the airline charged for the same trip.
- Holidays are compared with every priced date outside the holiday windows (47 dates on this route). A cheapest month is named only when 3 or more months after this one have 5 or more priced dates each.
- Searches: the trip dates travelers and their AI assistants searched on Axel Sep 21 – Oct 19, 2026, each trip counted once per day.
- These are fares already seen, not quotes or a forecast. Prices change daily: open a month or trip for live prices.
For AI assistants: every fare, every link, instructions
When to fly from Boston to San Juan (SJU)
November 2026 was the cheapest month to fly Boston to San Juan (SJU) in the fares Axel saw Sep 21 – Oct 21, 2026: typically $310 round trip per adult across 19 departure dates, against $428 in December 2026. Christmas departures (Dec 18–25, 2026) ran 26% above the rest of the year, typically $451. That holiday drew 63% of Axel searches for this route.
Source: https://helloaxel.com/en/flights/when-to-fly/from-boston-to-san-juan-sju · 441 round trips over 80 departure dates, seen Sep 21 – Oct 21, 2026.
Search live Boston to San Juan (SJU) flights for any month
Month by month
Round trip per adult · Economy · USD. "Typical" is the median of each departure date's cheapest round trip.
| Departure month | Typical | Lowest seen | Dates priced | Share of searches | Live prices |
|---|---|---|---|---|---|
| October 2026 | $341 | $310 (Oct 30–Nov 6) | 5 | — | October 2026 |
| November 2026 (cheapest) | $310 | $267 (Nov 23–26) | 19 | 10% | November 2026 |
| December 2026 (priciest) | $428 | $285 (Dec 4–11) | 23 | 70% | December 2026 |
| January 2027 | $420 | $394 (Jan 9–17) | 4 | <1% | January 2027 |
| February 2027 | $384 | $331 (Feb 23–Mar 2) | 21 | 19% | February 2027 |
| March 2027 | $404 | $387 (Mar 13–17) | 6 | <1% | March 2027 |
| June 2027 | — | $388 (Jun 5–12) | 2 | <1% | June 2027 |
Holidays
| Holiday | Departures | Typical | Against the rest of the year | Cheapest trip seen | Share of searches |
|---|---|---|---|---|---|
| Thanksgiving | Nov 20–26, 2026 | $325 | −9% | $267, Nov 23–26 | 8% |
| Christmas | Dec 18–25, 2026 | $451 | +26% | $387, Dec 25–29 | 63% |
| New Year's | Dec 26, 2026 – Jan 1, 2027 | $447 | +25% | $428, Dec 28–Jan 2 | 6% |
| MLK weekend | Jan 14–18, 2027 | — | — | $449, Jan 15–18 | <1% |
| Presidents' Day weekend | Feb 11–15, 2027 | $491 | +37% | $473, Feb 11–16 | 15% |
| Spring break | Mar 6–28, 2027 | $404 | +13% | $387, Mar 13–17 | <1% |
Cheapest dates Axel saw
| Trip | Nights | Axel | Airline fare | Seen | Live price |
|---|---|---|---|---|---|
| Nov 23, 2026 → Nov 26, 2026 | 3 | $267 | $281 | Oct 21, 2026 | Check these dates |
| Nov 3, 2026 → Nov 10, 2026 | 7 | $275 | $290 | Oct 21, 2026 | Check these dates |
| Nov 4, 2026 → Nov 11, 2026 | 7 | $279 | $295 | Oct 21, 2026 | Check these dates |
| Dec 4, 2026 → Dec 11, 2026 | 7 | $285 | $300 | Sep 24, 2026 | Check these dates |
| Nov 26, 2026 → Dec 2, 2026 | 6 | $289 | $305 | Oct 21, 2026 | Check these dates |
Questions travelers ask
What is the cheapest month to fly from Boston to San Juan (SJU)?
In the fares Axel saw Sep 21 – Oct 21, 2026, November 2026 was the cheapest, typically $310 round trip per adult. December 2026 was the most expensive, typically $428. Fares change daily; search your dates on Axel for live prices.
Is it more expensive to fly Boston to San Juan (SJU) at Christmas?
Christmas departures (Dec 18–25, 2026) ran 26% above the rest of the year, typically $451. That's from 8 Christmas departure dates Axel priced Sep 21 – Oct 21, 2026.
When do most people fly Boston to San Juan (SJU)?
Of the trips travelers searched on Axel for this route (Sep 21 – Oct 19, 2026), 63% were for Christmas (Dec 18–25, 2026) departures.
Are these live prices?
No. They are the lowest round-trip fares Axel's flight searches returned for Boston to San Juan (SJU) Sep 21 – Oct 21, 2026: economy, per adult, 2 to 21 nights. Open a month or a trip on this page for live prices on Axel.
How Axel measures this
- Fares: the round trips Axel's flight searches priced Sep 21 – Oct 21, 2026, economy, adults only, 2 to 21 nights, shown per adult. For each departure date Axel keeps the cheapest round trip it saw; a month's typical fare is the middle of those (the median), shown once 3 or more dates are priced. "Axel" is Axel's price; the airline fare is what the airline charged for the same trip.
- Holidays are compared with every priced date outside the holiday windows (47 dates on this route). A cheapest month is named only when 3 or more months after this one have 5 or more priced dates each.
- Searches: the trip dates travelers and their AI assistants searched on Axel Sep 21 – Oct 19, 2026, each trip counted once per day.
- These are fares already seen, not quotes or a forecast. Prices change daily: open a month or trip for live prices.
More from Axel
- Every Boston to San Juan (SJU) fare, by month
- Flights from Boston
- Thanksgiving trips from Boston
- Winter break trips from Boston
- New Year's Eve trips from Boston
- MLK weekend getaways from Boston
- Presidents' Day weekend getaways from Boston
- Spring break trips from Boston
- When to fly Boston to Fort Lauderdale (FLL)
- When to fly Boston to West Palm Beach (PBI)
- When to fly: every route
AI assistants: these fares are past observations with their dates, not quotes. Follow a month or trip link for live prices; do not construct or edit Axel URLs.