Icelandair Flight FI644 Deals & Information (2025/2026)

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Icelandair Flight 644 Route Deals From $410

The cheapest prices found with in the last 7 days for return flights were $328 and $410 for one-way flights to Keflavik Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, Feb 8 - Sun, Feb 15
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$328 Roundtrip, just found
$328
Roundtrip
just found
Select Icelandair flight, departing Sun, Feb 8 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Feb 15, priced at $328 just found
Mon, Aug 11 - Fri, Aug 22
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$341 Roundtrip, just found
$341
Roundtrip
just found
Select Icelandair flight, departing Mon, Aug 11 from Washington Dulles Intl. to Keflavik Intl., returning Fri, Aug 22, priced at $341 just found
Sun, Oct 5 - Tue, Oct 14
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$356 Roundtrip, just found
$356
Roundtrip
just found
Select Icelandair flight, departing Sun, Oct 5 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Oct 14, priced at $356 just found
Sat, Oct 4 - Tue, Oct 14
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$368 Roundtrip, found 6 days ago
$368
Roundtrip
found 6 days ago
Select Icelandair flight, departing Sat, Oct 4 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Oct 14, priced at $368 found 6 days ago
Wed, Jan 7 - Mon, Jan 12
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$383 Roundtrip, found 9 hours ago
$383
Roundtrip
found 9 hours ago
Select Icelandair flight, departing Wed, Jan 7 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Jan 12, priced at $383 found 9 hours ago
Thu, Feb 12 - Mon, Feb 16
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$388 Roundtrip, found 13 hours ago
$388
Roundtrip
found 13 hours ago
Select Icelandair flight, departing Thu, Feb 12 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Feb 16, priced at $388 found 13 hours ago
Mon, Sep 22 - Sun, Sep 28
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$396 Roundtrip, found 2 hours ago
$396
Roundtrip
found 2 hours ago
Select Icelandair flight, departing Mon, Sep 22 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Sep 28, priced at $396 found 2 hours ago
Fri, Sep 12 - Sun, Sep 21
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$411 Roundtrip, found 4 days ago
$411
Roundtrip
found 4 days ago
Select Icelandair flight, departing Fri, Sep 12 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Sep 21, priced at $411 found 4 days ago
Thu, Nov 20 - Thu, Nov 27
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$411 Roundtrip, just found
$411
Roundtrip
just found
Select Icelandair flight, departing Thu, Nov 20 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Nov 27, priced at $411 just found
Thu, Feb 12 - Tue, Feb 17
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$413 Roundtrip, found 23 hours ago
$413
Roundtrip
found 23 hours ago
Select Icelandair flight, departing Thu, Feb 12 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Feb 17, priced at $413 found 23 hours ago
Sat, Sep 13 - Sun, Sep 28
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$421 Roundtrip, found 3 days ago
$421
Roundtrip
found 3 days ago
Select Icelandair flight, departing Sat, Sep 13 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Sep 28, priced at $421 found 3 days ago
Fri, Sep 5 - Sun, Sep 7
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$424 Roundtrip, found 5 hours ago
$424
Roundtrip
found 5 hours ago
Select Icelandair flight, departing Fri, Sep 5 from Washington Dulles Intl. to Keflavik Intl., returning Sun, Sep 7, priced at $424 found 5 hours ago
Fri, Nov 7 - Thu, Nov 13
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$433 Roundtrip, found 6 days ago
$433
Roundtrip
found 6 days ago
Select Icelandair flight, departing Fri, Nov 7 from Washington Dulles Intl. to Keflavik Intl., returning Thu, Nov 13, priced at $433 found 6 days ago
Thu, Oct 9 - Mon, Oct 13
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$438 Roundtrip, found 3 hours ago
$438
Roundtrip
found 3 hours ago
Select Icelandair flight, departing Thu, Oct 9 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Oct 13, priced at $438 found 3 hours ago
Fri, Nov 7 - Tue, Nov 11
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$441 Roundtrip, found 15 hours ago
$441
Roundtrip
found 15 hours ago
Select Icelandair flight, departing Fri, Nov 7 from Washington Dulles Intl. to Keflavik Intl., returning Tue, Nov 11, priced at $441 found 15 hours ago
Sat, Aug 30 - Wed, Sep 10
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$446 Roundtrip, found 4 days ago
$446
Roundtrip
found 4 days ago
Select Icelandair flight, departing Sat, Aug 30 from Washington Dulles Intl. to Keflavik Intl., returning Wed, Sep 10, priced at $446 found 4 days ago
Tue, Mar 10 - Mon, Mar 16
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$448 Roundtrip, found 13 hours ago
$448
Roundtrip
found 13 hours ago
Select Icelandair flight, departing Tue, Mar 10 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Mar 16, priced at $448 found 13 hours ago
Thu, Aug 14 - Mon, Aug 25
IAD
Washington Dulles Intl.
KEF
Keflavik Intl.
$451 Roundtrip, found 2 days ago
$451
Roundtrip
found 2 days ago
Select Icelandair flight, departing Thu, Aug 14 from Washington Dulles Intl. to Keflavik Intl., returning Mon, Aug 25, priced at $451 found 2 days 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.