AirHint found the following cheapest return flights from Seattle (SEA) to Keflavik (KEF)
in August 2025 (see full year ).
Return flights
17 Aug
- 23 Aug
Icelandair
$ 530
direct
17 Aug
- 28 Aug
Icelandair
$ 530
direct
04 Aug
- 11 Aug
Icelandair
$ 547
direct
05 Aug
- 12 Aug
Icelandair
$ 547
direct
21 Aug
- 28 Aug
Icelandair
$ 547
direct
23 Aug
- 30 Aug
Icelandair
$ 547
direct
27 Aug
- 03 Sep
Icelandair
$ 547
direct
28 Aug
- 04 Sep
Icelandair
$ 547
direct
29 Aug
- 05 Sep
Icelandair
$ 547
direct
26 Aug
- 02 Sep
Icelandair
$ 547
direct
06 Aug
- 13 Aug
Icelandair
$ 549
direct
07 Aug
- 14 Aug
Icelandair
$ 549
direct
09 Aug
- 16 Aug
Icelandair
$ 549
direct
11 Aug
- 18 Aug
Icelandair
$ 549
direct
31 Aug
- 07 Sep
Icelandair
$ 549
direct
25 Aug
- 01 Sep
Icelandair
$ 572
direct
29 Aug
- 06 Sep
Icelandair
$ 645
direct
Also check the deals for one-way flights from Seattle to Keflavik in August .
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.