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 $510 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 15 - Tue, Sep 29
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$510 Roundtrip, found 5 days ago
$510
Roundtrip
found 5 days ago
Select Icelandair flight, departing Tue, Sep 15 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Sep 29, priced at $510 found 5 days ago
Thu, Oct 29 - Thu, Nov 5
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$525 Roundtrip, found 6 days ago
$525
Roundtrip
found 6 days ago
Select Icelandair flight, departing Thu, Oct 29 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Nov 5, priced at $525 found 6 days ago
Thu, Sep 10 - Tue, Sep 15
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$539 Roundtrip, found 6 days ago
$539
Roundtrip
found 6 days ago
Select Icelandair flight, departing Thu, Sep 10 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Sep 15, priced at $539 found 6 days ago
Mon, Oct 19 - Mon, Oct 26
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$554 Roundtrip, just found
$554
Roundtrip
just found
Select Icelandair flight, departing Mon, Oct 19 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Oct 26, priced at $554 just found
Tue, Nov 10 - Tue, Nov 17
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$561 Roundtrip, found 6 days ago
$561
Roundtrip
found 6 days ago
Select Icelandair flight, departing Tue, Nov 10 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Nov 17, priced at $561 found 6 days ago
Mon, Oct 19 - Mon, Nov 9
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$580 Roundtrip, found 2 hours ago
$580
Roundtrip
found 2 hours ago
Select Icelandair flight, departing Mon, Oct 19 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Nov 9, priced at $580 found 2 hours ago
Wed, Oct 21 - Wed, Oct 28
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$590 Roundtrip, just found
$590
Roundtrip
just found
Select Icelandair flight, departing Wed, Oct 21 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Oct 28, priced at $590 just found
Sun, Oct 18 - Thu, Oct 22
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$600 Roundtrip, found 1 day ago
$600
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sun, Oct 18 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Oct 22, priced at $600 found 1 day ago
Sun, May 31 - Fri, Jul 24
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$604 Roundtrip, found 15 hours ago
$604
Roundtrip
found 15 hours ago
Select Icelandair flight, departing Sun, May 31 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Jul 24, priced at $604 found 15 hours ago
Sat, Mar 13 - Mon, Mar 22
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$606 Roundtrip, found 1 day ago
$606
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sat, Mar 13 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Mar 22, priced at $606 found 1 day ago
Thu, Sep 3 - Fri, Sep 11
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$615 Roundtrip, found 6 days ago
$615
Roundtrip
found 6 days ago
Select Icelandair flight, departing Thu, Sep 3 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Sep 11, priced at $615 found 6 days ago
Fri, Oct 9 - Mon, Oct 19
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$615 Roundtrip, found 11 hours ago
$615
Roundtrip
found 11 hours ago
Select Icelandair flight, departing Fri, Oct 9 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Oct 19, priced at $615 found 11 hours ago
Fri, Oct 2 - Wed, Oct 7
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$616 Roundtrip, just found
$616
Roundtrip
just found
Select Icelandair flight, departing Fri, Oct 2 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Oct 7, priced at $616 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.