Cheapest return flights from Washington to San Juan in December from $244
AirHint found the following cheapest return flights from Washington (IAD) to San Juan (SJU)
in December 2025 (see full year ).
Return flights
11 Dec
- 14 Dec
Frontier Airlines
$ 244
direct
07 Dec
- 13 Dec
Frontier Airlines
$ 259
04 Dec
- 08 Dec
Frontier Airlines
$ 274
15 Dec
- 20 Dec
United
$ 343
12 Dec
- 20 Dec
United
$ 375
direct
04 Dec
- 09 Dec
United
$ 379
direct
16 Dec
- 20 Dec
United
$ 391
14 Dec
- 21 Dec
Frontier Airlines
$ 397
direct
13 Dec
- 21 Dec
Frontier Airlines
$ 436
30 Dec
- 10 Jan
United
$ 478
04 Dec
- 08 Dec
United
$ 486
direct
29 Dec
- 02 Jan
Frontier Airlines
$ 561
direct
23 Dec
- 02 Jan
Frontier Airlines
$ 565
direct
30 Dec
- 04 Jan
Frontier Airlines
$ 580
direct
23 Dec
- 03 Jan
Frontier Airlines
$ 580
direct
23 Dec
- 01 Jan
Frontier Airlines
$ 591
28 Dec
- 03 Jan
Frontier Airlines
$ 624
direct
28 Dec
- 02 Jan
Frontier Airlines
$ 628
direct
22 Dec
- 03 Jan
Frontier Airlines
$ 692
direct
26 Dec
- 02 Jan
Frontier Airlines
$ 692
direct
Also check the deals for one-way flights from Washington to San Juan in December .
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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