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 $496 and $443 for one-way flights to Keflavik Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Oct 19 - Fri, Oct 23
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$496 Roundtrip, just found
$496
Roundtrip
just found
Select Icelandair flight, departing Mon, Oct 19 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Oct 23, priced at $496 just found
Mon, Sep 21 - Mon, Sep 28
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$510 Roundtrip, found 5 hours ago
$510
Roundtrip
found 5 hours ago
Select Icelandair flight, departing Mon, Sep 21 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Sep 28, priced at $510 found 5 hours ago
Thu, Sep 24 - Thu, Oct 1
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$525 Roundtrip, found 2 hours ago
$525
Roundtrip
found 2 hours ago
Select Icelandair flight, departing Thu, Sep 24 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Oct 1, priced at $525 found 2 hours ago
Fri, Sep 11 - Mon, Sep 14
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$539 Roundtrip, found 5 hours ago
$539
Roundtrip
found 5 hours ago
Select Icelandair flight, departing Fri, Sep 11 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Sep 14, priced at $539 found 5 hours ago
Sat, Sep 26 - Sat, Oct 3
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$561 Roundtrip, found 4 hours ago
$561
Roundtrip
found 4 hours ago
Select Icelandair flight, departing Sat, Sep 26 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Oct 3, priced at $561 found 4 hours ago
Fri, Sep 11 - Sat, Sep 19
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$568 Roundtrip, found 6 days ago
$568
Roundtrip
found 6 days ago
Select Icelandair flight, departing Fri, Sep 11 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Sep 19, priced at $568 found 6 days ago
Tue, Sep 1 - Sat, Sep 12
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$574 Roundtrip, found 1 day ago
$574
Roundtrip
found 1 day ago
Select Icelandair flight, departing Tue, Sep 1 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Sep 12, priced at $574 found 1 day ago
Tue, Sep 1 - Tue, Sep 8
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$585 Roundtrip, found 15 hours ago
$585
Roundtrip
found 15 hours ago
Select Icelandair flight, departing Tue, Sep 1 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Sep 8, priced at $585 found 15 hours ago
Fri, Oct 9 - Fri, Oct 16
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$586 Roundtrip, found 5 hours ago
$586
Roundtrip
found 5 hours ago
Select Icelandair flight, departing Fri, Oct 9 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Oct 16, priced at $586 found 5 hours ago
Thu, Oct 8 - Mon, Oct 12
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$590 Roundtrip, found 3 hours ago
$590
Roundtrip
found 3 hours ago
Select Icelandair flight, departing Thu, Oct 8 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Oct 12, priced at $590 found 3 hours ago
Fri, Aug 28 - Tue, Sep 1
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$593 Roundtrip, found 1 day ago
$593
Roundtrip
found 1 day ago
Select Icelandair flight, departing Fri, Aug 28 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Sep 1, priced at $593 found 1 day ago
Fri, Sep 4 - Tue, Sep 8
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$600 Roundtrip, found 5 hours ago
$600
Roundtrip
found 5 hours ago
Select Icelandair flight, departing Fri, Sep 4 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Sep 8, priced at $600 found 5 hours ago
Thu, Oct 15 - Sun, Oct 18
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$601 Roundtrip, found 2 hours ago
$601
Roundtrip
found 2 hours ago
Select Icelandair flight, departing Thu, Oct 15 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Oct 18, priced at $601 found 2 hours ago
Thu, Sep 17 - Sat, Sep 26
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$603 Roundtrip, found 1 day ago
$603
Roundtrip
found 1 day ago
Select Icelandair flight, departing Thu, Sep 17 from Washington Dulles Intl. to Keflavik Intl., returning Sat, Sep 26, priced at $603 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.