AirHint found the following cheapest return flights from Washington (IAD) to San Juan (SJU)
in May 2025 (see full year ).
Return flights
25 May
- 29 May
Frontier Airlines
$ 155
direct
27 May
- 29 May
Frontier Airlines
$ 162
direct
27 May
- 01 Jun
Frontier Airlines
$ 187
direct
29 May
- 05 Jun
Frontier Airlines
$ 192
direct
18 May
- 22 May
Frontier Airlines
$ 218
29 May
- 01 Jun
Frontier Airlines
$ 240
direct
25 May
- 31 May
Frontier Airlines
$ 250
27 May
- 31 May
Frontier Airlines
$ 260
31 May
- 05 Jun
United
$ 276
direct
12 May
- 22 May
Frontier Airlines
$ 278
27 May
- 30 May
Frontier Airlines
$ 280
08 May
- 22 May
United
$ 291
24 May
- 27 May
Frontier Airlines
$ 304
11 May
- 25 May
United
$ 322
28 May
- 01 Jun
United
$ 327
28 May
- 02 Jun
United
$ 341
20 May
- 03 Jun
United
$ 348
25 May
- 08 Jun
United
$ 354
29 May
- 03 Jun
United
$ 355
31 May
- 14 Jun
United
$ 355
Also check the deals for one-way flights from Washington to San Juan in May .
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.
