AirHint found the following cheapest return flights from Seattle (SEA) to Keflavik (KEF)
in August 2025 (see full year ).
Return flights
09 Aug
- 15 Aug
Icelandair
$ 530
direct
05 Aug
- 14 Aug
Icelandair
$ 530
direct
28 Aug
- 07 Sep
Icelandair
$ 530
direct
31 Aug
- 08 Sep
Icelandair
$ 530
direct
26 Aug
- 02 Sep
Air Canada
$ 533
26 Aug
- 02 Sep
Icelandair
$ 535
direct
05 Aug
- 16 Aug
Icelandair
$ 545
direct
06 Aug
- 13 Aug
Icelandair
$ 547
direct
11 Aug
- 18 Aug
Icelandair
$ 547
direct
21 Aug
- 28 Aug
Icelandair
$ 547
direct
31 Aug
- 07 Sep
Icelandair
$ 547
direct
28 Aug
- 01 Sep
Icelandair
$ 554
direct
20 Aug
- 31 Aug
Icelandair
$ 620
direct
08 Aug
- 17 Aug
Icelandair
$ 629
direct
30 Aug
- 06 Sep
Icelandair
$ 645
direct
01 Aug
- 08 Aug
Icelandair
$ 647
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.