Icelandair Flight FI451 Deals & Information (2025/2026)

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Icelandair Flight 451 Route Deals From $136

The cheapest prices found with in the last 7 days for return flights were $191 and $136 for one-way flights to Keflavik Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Feb 6 - Mon, Feb 9
LHR
Heathrow
KEF
Keflavik Intl.
$191 Roundtrip, found 3 days ago
$191
Roundtrip
found 3 days ago
Select Icelandair flight, departing Fri, Feb 6 from Heathrow to Keflavik Intl., returning Mon, Feb 9, priced at $191 found 3 days ago
Thu, Nov 20 - Sun, Nov 23
LHR
Heathrow
KEF
Keflavik Intl.
$192 Roundtrip, found 4 days ago
$192
Roundtrip
found 4 days ago
Select Icelandair flight, departing Thu, Nov 20 from Heathrow to Keflavik Intl., returning Sun, Nov 23, priced at $192 found 4 days ago
Sun, Feb 1 - Thu, Feb 5
LHR
Heathrow
KEF
Keflavik Intl.
$192 Roundtrip, found 6 days ago
$192
Roundtrip
found 6 days ago
Select Icelandair flight, departing Sun, Feb 1 from Heathrow to Keflavik Intl., returning Thu, Feb 5, priced at $192 found 6 days ago
Sun, Sep 21 - Wed, Sep 24
LHR
Heathrow
KEF
Keflavik Intl.
$203 Roundtrip, found 3 days ago
$203
Roundtrip
found 3 days ago
Select Icelandair flight, departing Sun, Sep 21 from Heathrow to Keflavik Intl., returning Wed, Sep 24, priced at $203 found 3 days ago
Tue, Sep 23 - Tue, Sep 30
LHR
Heathrow
KEF
Keflavik Intl.
$204 Roundtrip, found 5 days ago
$204
Roundtrip
found 5 days ago
Select Icelandair flight, departing Tue, Sep 23 from Heathrow to Keflavik Intl., returning Tue, Sep 30, priced at $204 found 5 days ago
Wed, Mar 11 - Wed, Mar 18
LHR
Heathrow
KEF
Keflavik Intl.
$206 Roundtrip, just found
$206
Roundtrip
just found
Select Icelandair flight, departing Wed, Mar 11 from Heathrow to Keflavik Intl., returning Wed, Mar 18, priced at $206 just found
Sun, Nov 2 - Sun, Nov 9
LHR
Heathrow
KEF
Keflavik Intl.
$212 Roundtrip, found 19 hours ago
$212
Roundtrip
found 19 hours ago
Select Icelandair flight, departing Sun, Nov 2 from Heathrow to Keflavik Intl., returning Sun, Nov 9, priced at $212 found 19 hours ago
Sat, Nov 22 - Thu, Nov 27
LHR
Heathrow
KEF
Keflavik Intl.
$219 Roundtrip, found 23 hours ago
$219
Roundtrip
found 23 hours ago
Select Icelandair flight, departing Sat, Nov 22 from Heathrow to Keflavik Intl., returning Thu, Nov 27, priced at $219 found 23 hours ago
Sun, Nov 2 - Sun, Nov 9
LHR
Heathrow
KEF
Keflavik Intl.
$225 Roundtrip, found 19 hours ago
$225
Roundtrip
found 19 hours ago
Select Icelandair flight, departing Sun, Nov 2 from Heathrow to Keflavik Intl., returning Sun, Nov 9, priced at $225 found 19 hours ago
Fri, Feb 6 - Mon, Feb 9
LHR
Heathrow
KEF
Keflavik Intl.
$229 Roundtrip, found 3 days ago
$229
Roundtrip
found 3 days ago
Select Icelandair flight, departing Fri, Feb 6 from Heathrow to Keflavik Intl., returning Mon, Feb 9, priced at $229 found 3 days ago
Tue, Sep 23 - Wed, Oct 1
LHR
Heathrow
KEF
Keflavik Intl.
$230 Roundtrip, found 4 days ago
$230
Roundtrip
found 4 days ago
Select Icelandair flight, departing Tue, Sep 23 from Heathrow to Keflavik Intl., returning Wed, Oct 1, priced at $230 found 4 days ago
Tue, Sep 23 - Mon, Sep 29
LHR
Heathrow
KEF
Keflavik Intl.
$232 Roundtrip, found 13 hours ago
$232
Roundtrip
found 13 hours ago
Select Icelandair flight, departing Tue, Sep 23 from Heathrow to Keflavik Intl., returning Mon, Sep 29, priced at $232 found 13 hours ago
Thu, Nov 6 - Mon, Nov 10
LHR
Heathrow
KEF
Keflavik Intl.
$238 Roundtrip, found 3 days ago
$238
Roundtrip
found 3 days ago
Select Icelandair flight, departing Thu, Nov 6 from Heathrow to Keflavik Intl., returning Mon, Nov 10, priced at $238 found 3 days ago
Wed, Feb 11 - Tue, Feb 17
LHR
Heathrow
KEF
Keflavik Intl.
$241 Roundtrip, found 19 hours ago
$241
Roundtrip
found 19 hours ago
Select Icelandair flight, departing Wed, Feb 11 from Heathrow to Keflavik Intl., returning Tue, Feb 17, priced at $241 found 19 hours ago
Sun, Sep 21 - Mon, Sep 29
LHR
Heathrow
KEF
Keflavik Intl.
$245 Roundtrip, found 18 hours ago
$245
Roundtrip
found 18 hours ago
Select Icelandair flight, departing Sun, Sep 21 from Heathrow to Keflavik Intl., returning Mon, Sep 29, priced at $245 found 18 hours 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.