Icelandair Flight 644 Deals & Information (2026/2027)

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Icelandair Flight 644 Route Deals From $411

The cheapest prices found with in the last 7 days for return flights were $452 and $411 for one-way flights to Keflavik Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Apr 14 - Mon, Apr 20
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$452 Roundtrip, just found
$452
Roundtrip
just found
Select Icelandair flight, departing Tue, Apr 14 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Apr 20, priced at $452 just found
Mon, Feb 23 - Tue, Mar 3
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$455 Roundtrip, found 1 day ago
$455
Roundtrip
found 1 day ago
Select Icelandair flight, departing Mon, Feb 23 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Mar 3, priced at $455 found 1 day ago
Mon, Apr 20 - Wed, Apr 29
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$478 Roundtrip, just found
$478
Roundtrip
just found
Select Icelandair flight, departing Mon, Apr 20 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Apr 29, priced at $478 just found
Mon, Feb 23 - Sun, Mar 1
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$482 Roundtrip, found 1 day ago
$482
Roundtrip
found 1 day ago
Select Icelandair flight, departing Mon, Feb 23 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Mar 1, priced at $482 found 1 day ago
Tue, Apr 28 - Sat, May 2
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$493 Roundtrip, found 5 hours ago
$493
Roundtrip
found 5 hours ago
Select Icelandair flight, departing Tue, Apr 28 from Washington Dulles Intl. to Keflavik Intl., returning Sat, May 2, priced at $493 found 5 hours ago
Wed, Apr 8 - Wed, Apr 15
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$503 Roundtrip, found 2 hours ago
$503
Roundtrip
found 2 hours ago
Select Icelandair flight, departing Wed, Apr 8 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Apr 15, priced at $503 found 2 hours ago
Sat, Oct 3 - Mon, Oct 12
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$504 Roundtrip, found 1 hour ago
$504
Roundtrip
found 1 hour ago
Select Icelandair flight, departing Sat, Oct 3 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Oct 12, priced at $504 found 1 hour ago
Thu, Apr 23 - Thu, Apr 30
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$514 Roundtrip, found 3 days ago
$514
Roundtrip
found 3 days ago
Select Icelandair flight, departing Thu, Apr 23 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Apr 30, priced at $514 found 3 days ago
Tue, Jun 16 - Sun, Jun 21
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$518 Roundtrip, just found
$518
Roundtrip
just found
Select Icelandair flight, departing Tue, Jun 16 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Jun 21, priced at $518 just found
Fri, May 29 - Mon, Jun 15
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$518 Roundtrip, found 6 days ago
$518
Roundtrip
found 6 days ago
Select Icelandair flight, departing Fri, May 29 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Jun 15, priced at $518 found 6 days ago
Thu, Oct 29 - Tue, Nov 3
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$530 Roundtrip, found 3 days ago
$530
Roundtrip
found 3 days ago
Select Icelandair flight, departing Thu, Oct 29 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Nov 3, priced at $530 found 3 days ago
Fri, Oct 9 - Thu, Oct 15
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$540 Roundtrip, found 9 hours ago
$540
Roundtrip
found 9 hours ago
Select Icelandair flight, departing Fri, Oct 9 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Oct 15, priced at $540 found 9 hours ago
Thu, May 14 - Sun, May 17
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$544 Roundtrip, found 2 hours ago
$544
Roundtrip
found 2 hours ago
Select Icelandair flight, departing Thu, May 14 from Washington Dulles Intl. to Keflavik Intl., returning Sun, May 17, priced at $544 found 2 hours ago
Mon, Jul 6 - Fri, Jul 17
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$554 Roundtrip, just found
$554
Roundtrip
just found
Select Icelandair flight, departing Mon, Jul 6 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Jul 17, priced at $554 just found
Thu, Dec 3 - Mon, Dec 7
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$556 Roundtrip, found 15 hours ago
$556
Roundtrip
found 15 hours ago
Select Icelandair flight, departing Thu, Dec 3 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Dec 7, priced at $556 found 15 hours ago
Tue, Jun 16 - Sun, Jun 21
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$564 Roundtrip, just found
$564
Roundtrip
just found
Select Icelandair flight, departing Tue, Jun 16 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Jun 21, priced at $564 just found
Wed, Jun 17 - Sun, Jun 21
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$600 Roundtrip, just found
$600
Roundtrip
just found
Select Icelandair flight, departing Wed, Jun 17 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Jun 21, priced at $600 just found

Frequently asked questions

What route does flight number FI644 take?
Flight number FI644 takes roughly 5 hours and 55 minutes to jet non-stop from IAD to Reykjavik Airport (KEF-Keflavik Intl.). Sure, there's magic in the destination, but the journey is always half the fun!
How often is FI644 on time?
If you're flying on Icelandair flight number FI644 between Washington, DC Airport (IAD-Washington Dulles Intl.) and Reykjavík–Keflavík Airport, 90% of these journeys touch down according to schedule. If you are delayed, you're likely to wait approximately 25 minutes on average. Thanks to the air carrier's high standards, this service has a 3.8-star rating.
What kind of plane is on flight number FI644?
The route for flight number FI644 is most commonly Washington, DC Airport (IAD-Washington Dulles Intl.) to Reykjavik Airport (KEF-Keflavik Intl.), and the Boeing 767-300 is the type of aircraft you're likely to be flying on.
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 FI644 flight with Travelocity, please visit our Customer Service Portal.