Icelandair Flight 451 Deals & Information (2026/2027)

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Icelandair Flight 451 Route Deals From $99

The cheapest prices found with in the last 7 days for return flights were $179 and $99 for one-way flights to Keflavik Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, Mar 1 - Thu, Mar 5
LHR
Heathrow
KEF
Keflavik Intl.
$179 Roundtrip, found 5 days ago
$179
Roundtrip
found 5 days ago
Select Icelandair flight, departing Sun, Mar 1 from Heathrow to Keflavik Intl., returning Thu, Mar 5, priced at $179 found 5 days ago
Thu, Apr 23 - Mon, Apr 27
LHR
Heathrow
KEF
Keflavik Intl.
$182 Roundtrip, found 4 days ago
$182
Roundtrip
found 4 days ago
Select Icelandair flight, departing Thu, Apr 23 from Heathrow to Keflavik Intl., returning Mon, Apr 27, priced at $182 found 4 days ago
Mon, Feb 23 - Thu, Mar 5
LHR
Heathrow
KEF
Keflavik Intl.
$184 Roundtrip, found 5 days ago
$184
Roundtrip
found 5 days ago
Select Icelandair flight, departing Mon, Feb 23 from Heathrow to Keflavik Intl., returning Thu, Mar 5, priced at $184 found 5 days ago
Tue, Apr 7 - Tue, Apr 14
LHR
Heathrow
KEF
Keflavik Intl.
$189 Roundtrip, found 5 days ago
$189
Roundtrip
found 5 days ago
Select Icelandair flight, departing Tue, Apr 7 from Heathrow to Keflavik Intl., returning Tue, Apr 14, priced at $189 found 5 days ago
Thu, Apr 23 - Mon, Apr 27
LHR
Heathrow
KEF
Keflavik Intl.
$196 Roundtrip, found 4 days ago
$196
Roundtrip
found 4 days ago
Select Icelandair flight, departing Thu, Apr 23 from Heathrow to Keflavik Intl., returning Mon, Apr 27, priced at $196 found 4 days ago
Thu, May 7 - Wed, May 13
LHR
Heathrow
KEF
Keflavik Intl.
$197 Roundtrip, found 5 days ago
$197
Roundtrip
found 5 days ago
Select Icelandair flight, departing Thu, May 7 from Heathrow to Keflavik Intl., returning Wed, May 13, priced at $197 found 5 days ago
Tue, Feb 24 - Fri, Nov 13
LHR
Heathrow
KEF
Keflavik Intl.
$198 Roundtrip, found 1 day ago
$198
Roundtrip
found 1 day ago
Select Icelandair flight, departing Tue, Feb 24 from Heathrow to Keflavik Intl., returning Fri, Nov 13, priced at $198 found 1 day ago
Wed, May 13 - Sun, May 17
LHR
Heathrow
KEF
Keflavik Intl.
$208 Roundtrip, found 5 days ago
$208
Roundtrip
found 5 days ago
Select Icelandair flight, departing Wed, May 13 from Heathrow to Keflavik Intl., returning Sun, May 17, priced at $208 found 5 days ago
Thu, Apr 23 - Mon, Apr 27
LHR
Heathrow
KEF
Keflavik Intl.
$210 Roundtrip, found 4 days ago
$210
Roundtrip
found 4 days ago
Select Icelandair flight, departing Thu, Apr 23 from Heathrow to Keflavik Intl., returning Mon, Apr 27, priced at $210 found 4 days ago
Thu, May 7 - Wed, May 13
LHR
Heathrow
KEF
Keflavik Intl.
$211 Roundtrip, found 5 days ago
$211
Roundtrip
found 5 days ago
Select Icelandair flight, departing Thu, May 7 from Heathrow to Keflavik Intl., returning Wed, May 13, priced at $211 found 5 days ago
Mon, Mar 16 - Wed, Mar 25
LHR
Heathrow
KEF
Keflavik Intl.
$215 Roundtrip, found 3 days ago
$215
Roundtrip
found 3 days ago
Select Icelandair flight, departing Mon, Mar 16 from Heathrow to Keflavik Intl., returning Wed, Mar 25, priced at $215 found 3 days ago
Tue, Apr 14 - Tue, Apr 21
LHR
Heathrow
KEF
Keflavik Intl.
$218 Roundtrip, found 2 days ago
$218
Roundtrip
found 2 days ago
Select Icelandair flight, departing Tue, Apr 14 from Heathrow to Keflavik Intl., returning Tue, Apr 21, priced at $218 found 2 days ago
Sun, Apr 19 - Tue, Apr 28
LHR
Heathrow
KEF
Keflavik Intl.
$221 Roundtrip, found 2 days ago
$221
Roundtrip
found 2 days ago
Select Icelandair flight, departing Sun, Apr 19 from Heathrow to Keflavik Intl., returning Tue, Apr 28, priced at $221 found 2 days ago
Wed, May 13 - Sun, May 17
LHR
Heathrow
KEF
Keflavik Intl.
$222 Roundtrip, found 5 days ago
$222
Roundtrip
found 5 days ago
Select Icelandair flight, departing Wed, May 13 from Heathrow to Keflavik Intl., returning Sun, May 17, priced at $222 found 5 days ago
Wed, Feb 4 - Fri, Feb 6
LHR
Heathrow
KEF
Keflavik Intl.
$223 Roundtrip, found 5 days ago
$223
Roundtrip
found 5 days ago
Select Icelandair flight, departing Wed, Feb 4 from Heathrow to Keflavik Intl., returning Fri, Feb 6, priced at $223 found 5 days ago
Thu, Apr 23 - Tue, Apr 28
LHR
Heathrow
KEF
Keflavik Intl.
$225 Roundtrip, found 3 days ago
$225
Roundtrip
found 3 days ago
Select Icelandair flight, departing Thu, Apr 23 from Heathrow to Keflavik Intl., returning Tue, Apr 28, priced at $225 found 3 days ago

Frequently asked questions

What route does flight number FI451 take?
FI451 takes 3 hours and 10 minutes to jet directly from Heathrow Airport (LHR) to Reykjavik Airport (KEF-Keflavik Intl.). We all know there's magic in the destination, but getting there is half the fun!
How often is FI451 on time?
Icelandair flight number FI451 between Heathrow Airport (LHR) and Keflavik Intl. Airport (KEF) lands on schedule 100% of the time — so you can rest easy knowing you'll arrive at your destination ASAP. If this trip happens to be delayed, you'll probably wait 4 minutes. This route has a star rating of 4.15.
What terminal does FI451 fly out of?
Direct flights to and from London Airport (LHR-Heathrow) and Keflavik Intl. Airport (KEF) are served by flight number FI451, and passengers booked on this route usually jet off from Terminal 2.
What kind of plane is on flight number FI451?
Prepare to board a Boeing 757-200 if your flight number is FI451. Nearly all services from Heathrow Airport (LHR) to Reykjavik Airport (KEF-Keflavik Intl.) operate using this kind of plane.
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 FI451 flight with Travelocity, please visit our Customer Service Portal.