Icelandair Flight 644 Deals & Information (2026/2027)

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Icelandair Flight 644 Route Deals From $443

The cheapest prices found with in the last 7 days for return flights were $431 and $443 for one-way flights to Keflavik Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Sep 8 - Fri, Sep 18
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$431 Roundtrip, found 4 hours ago
$431
Roundtrip
found 4 hours ago
Select Icelandair flight, departing Tue, Sep 8 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Sep 18, priced at $431 found 4 hours ago
Sat, Aug 22 - Tue, Sep 1
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$464 Roundtrip, found 1 day ago
$464
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sat, Aug 22 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Sep 1, priced at $464 found 1 day ago
Mon, Nov 9 - Mon, Nov 16
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$485 Roundtrip, just found
$485
Roundtrip
just found
Select Icelandair flight, departing Mon, Nov 9 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Nov 16, priced at $485 just found
Sun, Aug 23 - Tue, Sep 1
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$499 Roundtrip, just found
$499
Roundtrip
just found
Select Icelandair flight, departing Sun, Aug 23 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Sep 1, priced at $499 just found
Mon, Sep 14 - Fri, Sep 18
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$525 Roundtrip, found 3 days ago
$525
Roundtrip
found 3 days ago
Select Icelandair flight, departing Mon, Sep 14 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Sep 18, priced at $525 found 3 days ago
Tue, Sep 22 - Wed, Oct 7
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$546 Roundtrip, found 2 days ago
$546
Roundtrip
found 2 days ago
Select Icelandair flight, departing Tue, Sep 22 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Oct 7, priced at $546 found 2 days ago
Mon, Jan 18 - Fri, Jan 22
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$556 Roundtrip, just found
$556
Roundtrip
just found
Select Icelandair flight, departing Mon, Jan 18 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Jan 22, priced at $556 just found
Mon, Sep 14 - Tue, Sep 22
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$560 Roundtrip, found 1 hour ago
$560
Roundtrip
found 1 hour ago
Select Icelandair flight, departing Mon, Sep 14 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Sep 22, priced at $560 found 1 hour ago
Mon, Sep 21 - Tue, Oct 6
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$566 Roundtrip, found 1 day ago
$566
Roundtrip
found 1 day ago
Select Icelandair flight, departing Mon, Sep 21 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Oct 6, priced at $566 found 1 day ago
Wed, Dec 16 - Sun, Dec 27
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$576 Roundtrip, found 1 day ago
$576
Roundtrip
found 1 day ago
Select Icelandair flight, departing Wed, Dec 16 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Dec 27, priced at $576 found 1 day ago
Fri, Nov 6 - Wed, Nov 11
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$581 Roundtrip, found 1 hour ago
$581
Roundtrip
found 1 hour ago
Select Icelandair flight, departing Fri, Nov 6 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Nov 11, priced at $581 found 1 hour ago
Sat, Sep 12 - Fri, Sep 18
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$591 Roundtrip, found 2 hours ago
$591
Roundtrip
found 2 hours ago
Select Icelandair flight, departing Sat, Sep 12 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Sep 18, priced at $591 found 2 hours ago
Fri, Oct 16 - Sun, Oct 25
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$596 Roundtrip, found 1 day ago
$596
Roundtrip
found 1 day ago
Select Icelandair flight, departing Fri, Oct 16 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Oct 25, priced at $596 found 1 day ago
Wed, Dec 30 - Tue, Jan 5
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$606 Roundtrip, found 1 day ago
$606
Roundtrip
found 1 day ago
Select Icelandair flight, departing Wed, Dec 30 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Jan 5, priced at $606 found 1 day ago

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.