Icelandair Flight 521 Deals & Information (2025/2026)

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Icelandair Flight 521 Route Deals From $346

The cheapest prices found with in the last 7 days for return flights were $389 and $346 for one-way flights to Keflavik Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, May 6 - Wed, May 13
FRA
Frankfurt Intl.
KEF
Keflavik Intl.
$389 Roundtrip, found 10 hours ago
$389
Roundtrip
found 10 hours ago
Select Icelandair flight, departing Wed, May 6 from Frankfurt Intl. to Keflavik Intl., returning Wed, May 13, priced at $389 found 10 hours ago
Fri, May 1 - Tue, May 12
FRA
Frankfurt Intl.
KEF
Keflavik Intl.
$391 Roundtrip, found 5 days ago
$391
Roundtrip
found 5 days ago
Select Icelandair flight, departing Fri, May 1 from Frankfurt Intl. to Keflavik Intl., returning Tue, May 12, priced at $391 found 5 days ago
Thu, Jan 15 - Tue, Jan 20
FRA
Frankfurt Intl.
KEF
Keflavik Intl.
$401 Roundtrip, found 2 days ago
$401
Roundtrip
found 2 days ago
Select Icelandair flight, departing Thu, Jan 15 from Frankfurt Intl. to Keflavik Intl., returning Tue, Jan 20, priced at $401 found 2 days ago
Mon, Oct 13 - Tue, Oct 21
FRA
Frankfurt Intl.
KEF
Keflavik Intl.
$427 Roundtrip, found 9 hours ago
$427
Roundtrip
found 9 hours ago
Select Icelandair flight, departing Mon, Oct 13 from Frankfurt Intl. to Keflavik Intl., returning Tue, Oct 21, priced at $427 found 9 hours ago

Frequently asked questions

What route does flight number FI521 take?
You'll be touching down at Keflavik Intl. Airport (KEF) from FRA if you're traveling on flight number FI521. You'll be in the sky for 3 hours and 35 minutes on this trip. What's more, the flight conveniently travels non-stop.
How often is FI521 on time?
About 100% of FI521 flights head off on time — so if you're flying between Frankfurt am Main Airport and Keflavik Intl. Airport (KEF), you can kick back knowing that you will get where you need to as quickly as possible. In the rare event that your Icelandair trip encounters a delay, the average wait is about 7 minutes. Thanks to the airline's first-rate service, this route has a star rating of 4.
What terminal does FI521 fly out of?
You'll likely be climbing aboard the plane at Terminal 2 if you're flying on FI521 direct from Frankfurt Intl. Airport (FRA) to Reykjavík–Keflavík Airport.
What kind of plane is on flight number FI521?
The route for flight number FI521 is nearly always Frankfurt Intl. Airport (FRA) to Reykjavík–Keflavík Airport, and the Boeing 767-300 is the type of plane you're likely to be flying with.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your FI521 flight with Travelocity, please visit our Customer Service Portal.