# London (LHR) to Seattle (SEA) business class reward flights

In business class from London (LHR) to Seattle (SEA), the best value is also the fewest miles: 70,000 Atmos points plus $437 on American Airlines through Atmos Rewards (checked 3 Nov 2026).

Source: https://miles.zone/routes/lhr-sea
Data updated: 2026-11-03T07:07:04.594Z
Cash amounts are in US dollars.

Best value: 70,000 Atmos points plus $437 on American Airlines through Atmos Rewards, departing 2026-11-03.

## Every program and airline that can book it, next 60 days

| Airline | Program | Points | Cash on top | Routing | Departs | Checked |
| --- | --- | --- | --- | --- | --- | --- |
| American Airlines | [Atmos Rewards](https://miles.zone/programs/atmos-rewards) | 70,000 Atmos points | $437 | via ORD | 2026-11-03 | 3 Nov 2026, 07:05 UTC |
| British Airways | [Atmos Rewards](https://miles.zone/programs/atmos-rewards) | 70,000 Atmos points | $881 | via YVR | 2026-11-19 | 3 Nov 2026, 07:07 UTC |
| British Airways | [British Airways Club](https://miles.zone/programs/british-airways-club) | 99,000 Avios | Not quoted (about $886) | Nonstop | 2026-11-10 | 27 Oct 2026, 12:39 UTC |
| Air France | [Air France-KLM Flying Blue](https://miles.zone/programs/flying-blue) (Light fare) | 103,000 miles | $788 | via CDG | 2026-11-17 | 3 Nov 2026, 03:05 UTC |
| Alaska Airlines | [Atmos Rewards](https://miles.zone/programs/atmos-rewards) | 225,000 Atmos points | $412 | Nonstop | 2026-11-09 | 3 Nov 2026, 07:06 UTC |
| Delta Air Lines | [Delta SkyMiles](https://miles.zone/programs/delta-skymiles) | 295,000 miles | $413 | Nonstop | 2026-12-03 | 3 Nov 2026, 02:37 UTC |
| KLM | [Delta SkyMiles](https://miles.zone/programs/delta-skymiles) | 295,000 miles | $405 | via AMS | 2026-12-01 | 3 Nov 2026, 02:37 UTC |

## Route facts

Over the next 60 days we hold business class seats from London to Seattle on 60 of the 60 departure days, through 4 programs. These figures are counted from the seats stored for those dates, not from a price history; the typical day is the median of each day's cheapest seat.

| Program | Days with space | Lowest | Typical day | Cash on top |
| --- | --- | --- | --- | --- |
| [Atmos Rewards](https://miles.zone/programs/atmos-rewards) | 59 of 60 | 70,000 Atmos points | 70,000 Atmos points | $412 to $886 |
| [British Airways Club](https://miles.zone/programs/british-airways-club) | 21 of 60 | 99,000 Avios | 99,000 Avios | Not quoted |
| [Air France-KLM Flying Blue](https://miles.zone/programs/flying-blue) | 25 of 60 | 103,000 miles | 125,500 miles | $788 |
| [Delta SkyMiles](https://miles.zone/programs/delta-skymiles) | 60 of 60 | 295,000 miles | 365,000 miles | $405 to $421 |

Nonstop seats on Alaska Airlines, British Airways and Delta Air Lines.
With a connection on Air France, American Airlines and KLM.

## How to book it

1. [Atmos Rewards](https://miles.zone/programs/atmos-rewards) books on alaskaair.com: sign in there, search LHR to SEA in business class on a date with space, and pay in Atmos points with the cash on top (from $412).
2. [British Airways Club](https://miles.zone/programs/british-airways-club) books on avios.com: sign in there, search LHR to SEA in business class on a date with space, and pay in Avios with the cash on top.
3. [Air France-KLM Flying Blue](https://miles.zone/programs/flying-blue) books on airfrance.fr: sign in there, search LHR to SEA in business class on a date with space, and pay in miles with the cash on top (from $788).
4. [Delta SkyMiles](https://miles.zone/programs/delta-skymiles) books on delta.com: sign in there, search LHR to SEA in business class on a date with space, and pay in miles with the cash on top (from $405).

MilesZone finds the seat; it does not book it or take payment.

## More routes from London

- [Amsterdam (AMS)](https://miles.zone/routes/lhr-ams)
- [Barcelona (BCN)](https://miles.zone/routes/lhr-bcn)
- [Paris (CDG)](https://miles.zone/routes/lhr-cdg)
- [Dublin (DUB)](https://miles.zone/routes/lhr-dub)
- [Edinburgh (EDI)](https://miles.zone/routes/lhr-edi)
- [Rome (FCO)](https://miles.zone/routes/lhr-fco)
- [Frankfurt (FRA)](https://miles.zone/routes/lhr-fra)
- [Madrid (MAD)](https://miles.zone/routes/lhr-mad)
- [Manchester (MAN)](https://miles.zone/routes/lhr-man)
- [Munich (MUC)](https://miles.zone/routes/lhr-muc)
- [Zurich (ZRH)](https://miles.zone/routes/lhr-zrh)
- [Atlanta (ATL)](https://miles.zone/routes/lhr-atl)

## More routes to Seattle

- [Paris (CDG)](https://miles.zone/routes/cdg-sea)
- [Dublin (DUB)](https://miles.zone/routes/dub-sea)
- [Edinburgh (EDI)](https://miles.zone/routes/edi-sea)
- [Frankfurt (FRA)](https://miles.zone/routes/fra-sea)
- [Manchester (MAN)](https://miles.zone/routes/man-sea)
- [Munich (MUC)](https://miles.zone/routes/muc-sea)
- [Tokyo (NRT)](https://miles.zone/routes/nrt-sea)
- [Amsterdam (AMS)](https://miles.zone/routes/ams-sea)
- [Rome (FCO)](https://miles.zone/routes/fco-sea)
- [Madrid (MAD)](https://miles.zone/routes/mad-sea)
- [Dubai (DXB)](https://miles.zone/routes/dxb-sea)
- [Barcelona (BCN)](https://miles.zone/routes/bcn-sea)