AirHint found the following cheapest one-way flights from Milwaukee (MKE) to San Juan (SJU) in December 2025 (see full year).
One-Way flights
| 29 Dec | Spirit Airlines | ||
| 31 Dec | Spirit Airlines | ||
| 28 Dec | Spirit Airlines | ||
| 21 Dec | Frontier Airlines | ||
| 23 Dec | Spirit Airlines | ||
| 22 Dec | Spirit Airlines | ||
| 18 Dec | Spirit Airlines |
Also check the deals for return flights from Milwaukee to San Juan in December.
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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.
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