AirHint found the following cheapest return flights from Seattle (SEA) to Keflavik (KEF)
in May 2025 (see full year ).
Return flights
06 May
- 13 May
Frontier Airlines
$ 530
17 May
- 24 May
Frontier Airlines
$ 550
19 May
- 27 May
WestJet
$ 560
18 May
- 27 May
WestJet
$ 561
01 May
- 07 May
Frontier Airlines
$ 561
19 May
- 26 May
WestJet
$ 565
21 May
- 29 May
WestJet
$ 566
18 May
- 26 May
WestJet
$ 569
20 May
- 26 May
Frontier Airlines
$ 602
13 May
- 22 May
Frontier Airlines
$ 605
26 May
- 03 Jun
WestJet
$ 673
21 May
- 01 Jun
WestJet
$ 701
31 May
- 11 Jun
Air France
$ 710
27 May
- 10 Jun
Air France
$ 710
29 May
- 06 Jun
Air France
$ 710
29 May
- 11 Jun
Air France
$ 718
29 May
- 11 Jun
Icelandair
$ 719
direct
27 May
- 03 Jun
Icelandair
$ 736
direct
27 May
- 10 Jun
Icelandair
$ 771
direct
31 May
- 11 Jun
Icelandair
$ 784
direct
Also check the deals for one-way flights from Seattle to Keflavik 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.
