Book Cheap Flights to United Kingdom on Alaska Airlines
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Find United Kingdom roundtrip flight deals.*
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Seattle (SEA)to
London (LHR)Sep 7, 2026 - Sep 12, 2026
From
$980
Seen: 13 hours ago
Round-trip
Saver
Seattle (SEA)to
London (LHR)Aug 19, 2026 - Oct 22, 2026
From
$1,030
Seen: 16 hours ago
Round-trip
Saver
Seattle (SEA)to
London (LHR)Aug 18, 2026 - Aug 22, 2026
From
$1,080
Seen: 10 hours ago
Round-trip
Saver
Seattle (SEA)to
London (LHR)Aug 27, 2026 - Sep 3, 2026
From
$1,125
Seen: 16 hours ago
Round-trip
Saver
Seattle (SEA)to
London (LHR)Aug 14, 2026 - Aug 22, 2026
From
$1,130
Seen: 10 hours ago
Round-trip
Saver
Portland (PDX)to
London (LHR)Sep 6, 2026 - Sep 11, 2026
From
$996
Seen: 15 hours ago
Round-trip
Saver
Portland (PDX)to
London (LHR)Aug 16, 2026 - Aug 29, 2026
From
$1,192
Seen: 14 hours ago
Round-trip
Saver
Portland (PDX)to
London (LHR)Aug 14, 2026 - Aug 21, 2026
From
$1,192
Seen: 12 hours ago
Round-trip
Saver
Portland (PDX)to
London (LHR)Aug 21, 2026 - Aug 24, 2026
From
$1,242
Seen: 9 hours ago
Round-trip
Saver
Portland (PDX)to
London (LHR)Sep 3, 2026 - Sep 7, 2026
From
$1,540
Seen: 8 hours ago
Round-trip
Saver
Honolulu (HNL)to
London (LHR)Aug 26, 2026 - Sep 4, 2026
From
$1,120
Seen: 12 hours ago
Round-trip
Saver
*Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.
One-way offers for plane tickets to United Kingdom.*
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From | To | Fare Type | Dates | Price | |
|---|---|---|---|---|---|
| Seattle (SEA) | London (LHR) | One-way | Saver | Depart: Apr 7, 2027 | From $325 Seen: 7 hours ago | |
| Seattle (SEA) | London (LHR) | One-way | Saver | Depart: Mar 17, 2027 | From $325 Seen: 12 hours ago | |
| Seattle (SEA) | London (LHR) | One-way | Saver | Depart: Apr 28, 2027 | From $325 Seen: 6 hours ago | |
| Denver (DEN) | London (LHR) | One-way | Saver | Depart: Dec 8, 2026 | From $347 Seen: 8 hours ago | |
| Honolulu (HNL) | London (LHR) | One-way | Saver | Depart: Nov 14, 2026 | From $370 Seen: 4 hours ago | |
| Seattle (SEA) | London (LHR) | One-way | Saver | Depart: Jul 4, 2027 | From $373 Seen: 8 hours ago | |
| Seattle (SEA) | London (LHR) | One-way | Saver | Depart: Sep 8, 2026 | From $374 Seen: 15 hours ago | |
| Seattle (SEA) | London (LHR) | One-way | Saver | Depart: Nov 3, 2026 | From $374 Seen: 13 hours ago | |
| Portland (PDX) | London (LHR) | One-way | Saver | Depart: May 6, 2027 | From $389 Seen: 15 hours ago | |
| Las Vegas (LAS) | London (LHR) | One-way | Saver | Depart: Apr 15, 2027 | From $392 Seen: 9 hours ago |
*Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.