Icelandair Flight FI645 Deals & Information (2025/2026)

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Icelandair Flight 645 Route Deals From $456

The cheapest prices found with in the last 7 days for return flights were $553 and $456 for one-way flights to Washington Dulles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, Dec 7 - Tue, Dec 16
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$553 Roundtrip, found 2 days ago
$553
Roundtrip
found 2 days ago
Select Icelandair flight, departing Sun, Dec 7 from Keflavik Intl. to Washington Dulles Intl., returning Tue, Dec 16, priced at $553 found 2 days ago
Sun, Jan 11 - Thu, Jan 15
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$557 Roundtrip, found 1 day ago
$557
Roundtrip
found 1 day ago
Select Icelandair flight, departing Sun, Jan 11 from Keflavik Intl. to Washington Dulles Intl., returning Thu, Jan 15, priced at $557 found 1 day ago
Wed, Apr 15 - Sun, Apr 19
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$565 Roundtrip, found 2 days ago
$565
Roundtrip
found 2 days ago
Select Icelandair flight, departing Wed, Apr 15 from Keflavik Intl. to Washington Dulles Intl., returning Sun, Apr 19, priced at $565 found 2 days ago
Sat, Oct 25 - Wed, Oct 29
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$566 Roundtrip, found 5 days ago
$566
Roundtrip
found 5 days ago
Select Icelandair flight, departing Sat, Oct 25 from Keflavik Intl. to Washington Dulles Intl., returning Wed, Oct 29, priced at $566 found 5 days ago
Tue, Mar 10 - Mon, Mar 16
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$567 Roundtrip, found 12 hours ago
$567
Roundtrip
found 12 hours ago
Select Icelandair flight, departing Tue, Mar 10 from Keflavik Intl. to Washington Dulles Intl., returning Mon, Mar 16, priced at $567 found 12 hours ago
Sun, Nov 2 - Sun, Nov 9
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$577 Roundtrip, found 4 days ago
$577
Roundtrip
found 4 days ago
Select Icelandair flight, departing Sun, Nov 2 from Keflavik Intl. to Washington Dulles Intl., returning Sun, Nov 9, priced at $577 found 4 days ago
Wed, Oct 15 - Mon, Oct 20
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$580 Roundtrip, found 1 day ago
$580
Roundtrip
found 1 day ago
Select Icelandair flight, departing Wed, Oct 15 from Keflavik Intl. to Washington Dulles Intl., returning Mon, Oct 20, priced at $580 found 1 day ago
Thu, Oct 30 - Mon, Nov 3
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$581 Roundtrip, found 6 days ago
$581
Roundtrip
found 6 days ago
Select Icelandair flight, departing Thu, Oct 30 from Keflavik Intl. to Washington Dulles Intl., returning Mon, Nov 3, priced at $581 found 6 days ago
Sat, Jun 13 - Sat, Jun 20
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$590 Roundtrip, found 5 days ago
$590
Roundtrip
found 5 days ago
Select Icelandair flight, departing Sat, Jun 13 from Keflavik Intl. to Washington Dulles Intl., returning Sat, Jun 20, priced at $590 found 5 days ago
Tue, Oct 7 - Mon, Oct 13
KEF
Keflavik Intl.
IAD
Washington Dulles Intl.
$592 Roundtrip, found 1 day ago
$592
Roundtrip
found 1 day ago
Select Icelandair flight, departing Tue, Oct 7 from Keflavik Intl. to Washington Dulles Intl., returning Mon, Oct 13, priced at $592 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.