Image Credits: E01, Creative Commons 2.0 (flickr)
Published August 8, 2023 by

Cheap Flights: Seattle to London, United Kingdom $402-$427 r/t [September-October] – Air Canada / United / Lufthansa

[08/08/2023 @ 03:10 PM CT] Deal time-stamp.
[08/08/2023 @ 06:08 PM CT] Fare gone. Removed by Air Canada / Expedia. If it goes back online, we will send out another notification.

Deals are usually valid 24 to 72 hours after posting, but can expire at any time (see time-stamp).

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Air Canada, United, and Lufthansa have round-trip flights from Seattle (SEA) to London, United Kingdom (LHR) for $402-$427 with a connection. Flights September to October. Departures on Monday, Tuesday, Wednesday, and Sunday. 7-day minimum stay required.

This fare is bookable if you use Google Flights to open an Expedia search, but is not available directly from the airline.

Avoid booking via very small or unknown OTAs. We suggest Expedia and Priceline, but it should show up on many others.

If you use the United℠ Explorer Card, your first standard checked-bag for you and your companion is free, you get priority boarding, two United Club passes per year, and you get a 25% discount on inflight purchases on United-operated flights as a statement credit.

If you use the Aeroplan® Credit Card, you and up to 8 companions can receive their first standard checked bag for free when travel originates on an Air Canada flight.

Here are some other offers that we think are worth mentioning. List updated 04/21/2026.

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Use the example date links on our website to pull up the fare.

  • Seattle to London, United Kingdom – Example Dates: (Expedia / Travelocity) Sep 27 – Oct 04 / Sep 27 – Oct 10 / Oct 03 – Oct 10 / Oct 03 – Oct 12 / Oct 04 – Oct 11 / Oct 04 – Oct 13 / Oct 04 – Oct 17 / Oct 08 – Oct 17 / Oct 09 – Oct 18 / Oct 10 – Oct 17 / Oct 10 – Oct 19 / Oct 11 – Oct 18 / Oct 11 – Oct 20 / Oct 11 – Oct 24 / Oct 15 – Oct 24 / Oct 16 – Oct 25 / Oct 17 – Oct 24 / Oct 17 – Oct 26 / Oct 18 – Oct 25 / Oct 18 – Oct 27 / Other dates: There may be more dates available than the ones we list here, use the “flexible date” button on Expedia to find similar fares.

I was able to pull this up on Google Flights. Screenshot taken when this post was initially created. See timestamps at the top of this post.

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  • Tips: Different booking websites will often have differing routes, prices, and availability. Before you finalize your purchase, do a quick check on Expedia, Skyscanner, and Kayak to see if any other site or airline is offering a better deal.


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Ren P. Artemio

Ren P. Artemio

Ren is the Chief Director of Nap Times at Escape Houston, Escape ATX, Cheap DFW, and Escape Flights. He really likes researching airfare and the travel industry, especially when it means getting a cheap flight to anywhere (he's not picky).

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