Cheapest return flights from Seattle to Keflavik in August from 393€
AirHint found the following cheapest return flights from Seattle (SEA) to Keflavik (KEF)
in August 2025 (see full year ).
Return flights
20 Aug
- 27 Aug
Icelandair
393 €
direct
20 Aug
- 28 Aug
Icelandair
393 €
direct
18 Aug
- 26 Aug
Icelandair
393 €
direct
17 Aug
- 26 Aug
Icelandair
393 €
direct
23 Aug
- 29 Aug
Icelandair
393 €
direct
31 Aug
- 05 Sep
Icelandair
393 €
direct
21 Aug
- 25 Aug
Delta
414 €
26 Aug
- 19 Sep
KLM
414 €
27 Aug
- 19 Sep
United
427 €
11 Aug
- 17 Aug
Icelandair
436 €
direct
02 Aug
- 16 Aug
Icelandair
436 €
direct
13 Aug
- 21 Aug
Icelandair
436 €
direct
21 Aug
- 25 Aug
Icelandair
440 €
direct
26 Aug
- 20 Sep
United
440 €
26 Aug
- 21 Sep
Air France
444 €
27 Aug
- 21 Sep
Air Canada
484 €
27 Aug
- 20 Sep
Air Canada
489 €
26 Aug
- 01 Sep
Frontier Airlines
552 €
26 Aug
- 01 Sep
Icelandair
585 €
direct
27 Aug
- 19 Sep
Icelandair
585 €
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.
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