How Axel worksWhen to fly from Chicago to San Juan (SJU)
Fares Axel saw Sep 21 – Oct 21, 2026 · 672 round trips over 105 departure dates · How Axel measures this
November 2026 was the cheapest month to fly Chicago to San Juan (SJU) in the fares Axel saw Sep 21 – Oct 21, 2026: typically $244 round trip per adult across 25 departure dates, against $373 in February 2027. Spring break departures (Mar 6–28, 2027) ran 27% above the rest of the year, typically $333. That holiday drew 47% of Axel searches for this route.
Search live prices for your dates- Cheapest month
- November 2026Typically $244 round trip
- Priciest month
- February 2027Typically $373 round trip
- Lowest fare seen
- $173Nov 10 – Nov 17, 2026, seen Oct 13
- When people go
- Spring breakMar 6–28, 2027 · 47% 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$218 →
6 dates priced · from $181 (Oct 29–Nov 5) · under 1% of searches
- November 2026$244 →
Cheapest month25 dates priced · from $173 (Nov 10–17) · 2% of searches
- December 2026$367 →
23 dates priced · from $173 (Dec 8–15) · 44% of searches
- January 2027$340 →
7 dates priced · from $233 (Jan 16–20) · under 1% of searches
- February 2027$373 →
Priciest month6 dates priced · from $228 (Feb 19–27) · 1% of searches
- March 2027$329 →
23 dates priced · from $228 (Mar 3–16) · 48% of searches
- April 2027$408 →
4 dates priced · from $262 (Apr 8–13) · 1% of searches
- June 2027$347 →
11 dates priced · from $262 (Jun 5–12) · 3% of searches
Holidays
Thanksgiving
+24% vs rest of yearLeaving Nov 20–26, 2026 · 2% of searches
Typically $326 round trip
Cheapest seen: $254, Nov 24–Dec 1 →Christmas
+56% vs rest of yearLeaving Dec 18–25, 2026 · 27% of searches
Typically $411 round trip
Cheapest seen: $328, Dec 20–25 →New Year's
+67% vs rest of yearLeaving Dec 26, 2026 – Jan 1, 2027 · 16% of searches
Typically $440 round trip
Cheapest seen: $367, Dec 31–Jan 7 →MLK weekend
Leaving Jan 14–18, 2027 · under 1% of searches
2 dates priced
Cheapest seen: $233, Jan 16–20 →Presidents' Day weekend
+77% vs rest of yearLeaving Feb 11–15, 2027 · 1% of searches
Typically $464 round trip
Cheapest seen: $357, Feb 13–20 →Spring break
+27% vs rest of yearLeaving Mar 6–28, 2027 · 47% of searches
Typically $333 round trip
Cheapest seen: $262, Mar 23–30 →
Cheapest dates Axel saw
- Nov 10 → Nov 17, 20267 nights · airline fare $182 · seen Oct 13$173Live price →
- Dec 8 → Dec 15, 20267 nights · airline fare $182 · seen Oct 19$173Live price →
- Oct 29 → Nov 5, 20267 nights · airline fare $191 · seen Oct 8$181Live price →
- Dec 1 → Dec 8, 20267 nights · airline fare $200 · seen Oct 21$189Live price →
- Nov 18 → Nov 23, 20265 nights · airline fare $200 · seen Oct 8$190Live price →
Questions travelers ask
What is the cheapest month to fly from Chicago to San Juan (SJU)?
In the fares Axel saw Sep 21 – Oct 21, 2026, November 2026 was the cheapest, typically $244 round trip per adult. February 2027 was the most expensive, typically $373. Fares change daily; search your dates on Axel for live prices.
Is it more expensive to fly Chicago to San Juan (SJU) at Spring break?
Spring break departures (Mar 6–28, 2027) ran 27% above the rest of the year, typically $333. That's from 20 Spring break departure dates Axel priced Sep 21 – Oct 21, 2026.
When do most people fly Chicago to San Juan (SJU)?
Of the trips travelers searched on Axel for this route (Sep 21 – Oct 19, 2026), 47% were for Spring break (Mar 6–28, 2027) departures.
Are these live prices?
No. They are the lowest round-trip fares Axel's flight searches returned for Chicago 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 (59 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 Chicago to San Juan (SJU)
November 2026 was the cheapest month to fly Chicago to San Juan (SJU) in the fares Axel saw Sep 21 – Oct 21, 2026: typically $244 round trip per adult across 25 departure dates, against $373 in February 2027. Spring break departures (Mar 6–28, 2027) ran 27% above the rest of the year, typically $333. That holiday drew 47% of Axel searches for this route.
Source: https://helloaxel.com/en/flights/when-to-fly/from-chicago-to-san-juan-sju · 672 round trips over 105 departure dates, seen Sep 21 – Oct 21, 2026.
Search live Chicago 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 | $218 | $181 (Oct 29–Nov 5) | 6 | <1% | October 2026 |
| November 2026 (cheapest) | $244 | $173 (Nov 10–17) | 25 | 2% | November 2026 |
| December 2026 | $367 | $173 (Dec 8–15) | 23 | 44% | December 2026 |
| January 2027 | $340 | $233 (Jan 16–20) | 7 | <1% | January 2027 |
| February 2027 (priciest) | $373 | $228 (Feb 19–27) | 6 | 1% | February 2027 |
| March 2027 | $329 | $228 (Mar 3–16) | 23 | 48% | March 2027 |
| April 2027 | $408 | $262 (Apr 8–13) | 4 | 1% | April 2027 |
| June 2027 | $347 | $262 (Jun 5–12) | 11 | 3% | June 2027 |
Holidays
| Holiday | Departures | Typical | Against the rest of the year | Cheapest trip seen | Share of searches |
|---|---|---|---|---|---|
| Thanksgiving | Nov 20–26, 2026 | $326 | +24% | $254, Nov 24–Dec 1 | 2% |
| Christmas | Dec 18–25, 2026 | $411 | +56% | $328, Dec 20–25 | 27% |
| New Year's | Dec 26, 2026 – Jan 1, 2027 | $440 | +67% | $367, Dec 31–Jan 7 | 16% |
| MLK weekend | Jan 14–18, 2027 | — | — | $233, Jan 16–20 | <1% |
| Presidents' Day weekend | Feb 11–15, 2027 | $464 | +77% | $357, Feb 13–20 | 1% |
| Spring break | Mar 6–28, 2027 | $333 | +27% | $262, Mar 23–30 | 47% |
Cheapest dates Axel saw
| Trip | Nights | Axel | Airline fare | Seen | Live price |
|---|---|---|---|---|---|
| Nov 10, 2026 → Nov 17, 2026 | 7 | $173 | $182 | Oct 13, 2026 | Check these dates |
| Dec 8, 2026 → Dec 15, 2026 | 7 | $173 | $182 | Oct 19, 2026 | Check these dates |
| Oct 29, 2026 → Nov 5, 2026 | 7 | $181 | $191 | Oct 8, 2026 | Check these dates |
| Dec 1, 2026 → Dec 8, 2026 | 7 | $189 | $200 | Oct 21, 2026 | Check these dates |
| Nov 18, 2026 → Nov 23, 2026 | 5 | $190 | $200 | Oct 8, 2026 | Check these dates |
Questions travelers ask
What is the cheapest month to fly from Chicago to San Juan (SJU)?
In the fares Axel saw Sep 21 – Oct 21, 2026, November 2026 was the cheapest, typically $244 round trip per adult. February 2027 was the most expensive, typically $373. Fares change daily; search your dates on Axel for live prices.
Is it more expensive to fly Chicago to San Juan (SJU) at Spring break?
Spring break departures (Mar 6–28, 2027) ran 27% above the rest of the year, typically $333. That's from 20 Spring break departure dates Axel priced Sep 21 – Oct 21, 2026.
When do most people fly Chicago to San Juan (SJU)?
Of the trips travelers searched on Axel for this route (Sep 21 – Oct 19, 2026), 47% were for Spring break (Mar 6–28, 2027) departures.
Are these live prices?
No. They are the lowest round-trip fares Axel's flight searches returned for Chicago 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 (59 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 Chicago to San Juan (SJU) fare, by month
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- Thanksgiving trips from Chicago
- Winter break trips from Chicago
- New Year's Eve trips from Chicago
- MLK weekend getaways from Chicago
- Presidents' Day weekend getaways from Chicago
- Spring break trips from Chicago
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- 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.