Icelandair Flight 645 Deals & Information (2026/2027)

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Icelandair Flight 645 Route Deals From $487

The cheapest prices found with in the last 7 days for return flights were $599 and $487 for one-way flights to Washington Dulles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Nov 3 - Tue, Nov 17
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$599 Roundtrip, found 4 days ago
$599
Roundtrip
found 4 days ago
Select Icelandair flight, departing Tue, Nov 3 from Keflavik Intl. to Washington Dulles Intl., returning Tue, Nov 17, priced at $599 found 4 days ago
Sun, Oct 4 - Tue, Oct 13
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$601 Roundtrip, found 6 days ago
$601
Roundtrip
found 6 days ago
Select Icelandair flight, departing Sun, Oct 4 from Keflavik Intl. to Washington Dulles Intl., returning Tue, Oct 13, priced at $601 found 6 days ago
Fri, Oct 2 - Thu, Oct 15
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$613 Roundtrip, found 5 days ago
$613
Roundtrip
found 5 days ago
Select Icelandair flight, departing Fri, Oct 2 from Keflavik Intl. to Washington Dulles Intl., returning Thu, Oct 15, priced at $613 found 5 days ago
Thu, Oct 1 - Sat, Oct 10
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$622 Roundtrip, just found
$622
Roundtrip
just found
Select Icelandair flight, departing Thu, Oct 1 from Keflavik Intl. to Washington Dulles Intl., returning Sat, Oct 10, priced at $622 just found
Wed, Jul 15 - Sun, Jul 26
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$623 Roundtrip, found 1 day ago
$623
Roundtrip
found 1 day ago
Select Icelandair flight, departing Wed, Jul 15 from Keflavik Intl. to Washington Dulles Intl., returning Sun, Jul 26, priced at $623 found 1 day ago
Thu, Jun 25 - Wed, Jul 1
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$625 Roundtrip, found 2 hours ago
$625
Roundtrip
found 2 hours ago
Select Icelandair flight, departing Thu, Jun 25 from Keflavik Intl. to Washington Dulles Intl., returning Wed, Jul 1, priced at $625 found 2 hours ago
Tue, Jun 16 - Wed, Jun 24
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$635 Roundtrip, found 1 day ago
$635
Roundtrip
found 1 day ago
Select Icelandair flight, departing Tue, Jun 16 from Keflavik Intl. to Washington Dulles Intl., returning Wed, Jun 24, priced at $635 found 1 day ago
Mon, Jun 15 - Wed, Jun 24
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$637 Roundtrip, found 6 days ago
$637
Roundtrip
found 6 days ago
Select Icelandair flight, departing Mon, Jun 15 from Keflavik Intl. to Washington Dulles Intl., returning Wed, Jun 24, priced at $637 found 6 days ago
Thu, Jun 25 - Wed, Jul 1
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$663 Roundtrip, found 2 hours ago
$663
Roundtrip
found 2 hours ago
Select Icelandair flight, departing Thu, Jun 25 from Keflavik Intl. to Washington Dulles Intl., returning Wed, Jul 1, priced at $663 found 2 hours ago
Wed, May 27 - Wed, Aug 12
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$663 Roundtrip, found 1 day ago
$663
Roundtrip
found 1 day ago
Select Icelandair flight, departing Wed, May 27 from Keflavik Intl. to Washington Dulles Intl., returning Wed, Aug 12, priced at $663 found 1 day ago

Frequently asked questions

What route does flight number FI645 take?
Flight number FI645 flies non-stop from Reykjavik Airport (KEF-Keflavik Intl.) to Washington, DC Airport (IAD-Washington Dulles Intl.). During this journey, you can expect to be in the air for 6 hours and 20 minutes. Book ahead to get your preferred seat.
What kind of plane is on flight number FI645?
The route for flight number FI645 is almost always KEF to Washington, DC Airport (IAD-Washington Dulles Intl.), and the Boeing 767-300 is the type of aircraft you'll probably 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 FI645 flight with Travelocity, please visit our Customer Service Portal.