Cheapest return flights from Ontario to San Juan in December from 284€
AirHint found the following cheapest return flights from Ontario (ONT) to San Juan (SJU)
in December 2025 (see full year ).
Return flights
05 Dec
- 14 Dec
Frontier Airlines
284 €
10 Dec
- 16 Dec
Southwest Airlines
316 €
08 Dec
- 16 Dec
Southwest Airlines
345 €
11 Dec
- 17 Dec
Southwest Airlines
402 €
03 Dec
- 08 Dec
Southwest Airlines
419 €
03 Dec
- 11 Dec
Southwest Airlines
431 €
01 Dec
- 03 Dec
Southwest Airlines
431 €
03 Dec
- 07 Dec
Southwest Airlines
431 €
04 Dec
- 08 Dec
Southwest Airlines
442 €
04 Dec
- 07 Dec
Southwest Airlines
455 €
29 Dec
- 08 Jan
Southwest Airlines
624 €
28 Dec
- 02 Jan
Frontier Airlines
713 €
29 Dec
- 10 Jan
Southwest Airlines
758 €
31 Dec
- 04 Jan
Southwest Airlines
913 €
29 Dec
- 03 Jan
Southwest Airlines
913 €
28 Dec
- 04 Jan
Southwest Airlines
1064 €
21 Dec
- 07 Jan
Southwest Airlines
1098 €
26 Dec
- 06 Jan
Southwest Airlines
1098 €
21 Dec
- 05 Jan
Southwest Airlines
1141 €
26 Dec
- 01 Jan
Southwest Airlines
1141 €
Also check the deals for one-way flights from Ontario to San Juan in December .
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