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 $430 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.
$430 Roundtrip, found 2 hours ago
$430
Roundtrip
found 2 hours ago
Select Icelandair flight, departing Tue, Sep 8 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Sep 18, priced at $430 found 2 hours ago
Sun, Aug 23 - Tue, Sep 1
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$464 Roundtrip, just found
$464
Roundtrip
just found
Select Icelandair flight, departing Sun, Aug 23 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Sep 1, priced at $464 just found
Sat, Feb 6 - Wed, Feb 10
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$485 Roundtrip, just found
$485
Roundtrip
just found
Select Icelandair flight, departing Sat, Feb 6 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Feb 10, priced at $485 just found
Sun, Aug 23 - Tue, Sep 1
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$498 Roundtrip, just found
$498
Roundtrip
just found
Select Icelandair flight, departing Sun, Aug 23 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Sep 1, priced at $498 just found
Mon, Sep 14 - Fri, Sep 18
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$525 Roundtrip, found 2 days ago
$525
Roundtrip
found 2 days ago
Select Icelandair flight, departing Mon, Sep 14 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Sep 18, priced at $525 found 2 days ago
Tue, Sep 22 - Wed, Oct 7
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$546 Roundtrip, found 6 hours ago
$546
Roundtrip
found 6 hours ago
Select Icelandair flight, departing Tue, Sep 22 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Oct 7, priced at $546 found 6 hours ago
Wed, Jan 13 - Mon, Jan 18
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$556 Roundtrip, found 1 hour ago
$556
Roundtrip
found 1 hour ago
Select Icelandair flight, departing Wed, Jan 13 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Jan 18, priced at $556 found 1 hour ago
Tue, Sep 22 - Mon, Sep 28
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$559 Roundtrip, found 21 hours ago
$559
Roundtrip
found 21 hours ago
Select Icelandair flight, departing Tue, Sep 22 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Sep 28, priced at $559 found 21 hours ago
Tue, Sep 8 - Fri, Sep 18
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$565 Roundtrip, found 2 hours ago
$565
Roundtrip
found 2 hours ago
Select Icelandair flight, departing Tue, Sep 8 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Sep 18, priced at $565 found 2 hours ago
Mon, Sep 28 - Mon, Oct 5
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$566 Roundtrip, found 6 hours ago
$566
Roundtrip
found 6 hours ago
Select Icelandair flight, departing Mon, Sep 28 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Oct 5, priced at $566 found 6 hours ago
Thu, Dec 31 - Tue, Jan 5
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$576 Roundtrip, found 4 days ago
$576
Roundtrip
found 4 days ago
Select Icelandair flight, departing Thu, Dec 31 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Jan 5, priced at $576 found 4 days ago
Wed, Sep 30 - Fri, Oct 9
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$581 Roundtrip, just found
$581
Roundtrip
just found
Select Icelandair flight, departing Wed, Sep 30 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Oct 9, priced at $581 just found
Sat, Sep 12 - Fri, Sep 18
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$590 Roundtrip, found 1 day ago
$590
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sat, Sep 12 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Sep 18, priced at $590 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.