Flights London → Seattle
As of July 2026, economy flights from London to Seattle have a typical range USD 847–1062, median USD 962. Full range across all 200 offers: USD 785–1191. We analyzed 200 offers from 8 airlines in a single price check.
Preview snapshot — prices change. Search for live results.
Data collected by LetsFG's multi-source price checks — every airline and the major booking sites checked for this route. How we collect data →
Why fly London → Seattle?
This route offers a gateway between two major global cities, connecting vibrant European culture with the Pacific Northwest's stunning natural beauty and tech hubs.
Best for: leisure travelers seeking transatlantic adventure · business travelers connecting with the tech industry
Booking tips: To secure a better deal, aim to book when prices are closer to the lower end of the range, around $880, as the median price is $962 and prices can reach up to $1191.
Prices for this long-haul transatlantic route are within a typical range for similar distance international flights, with a significant portion of the total cost potentially coming from ancillary fees.
AI-generated summary from price distribution data · gemini-2.5-flash-lite
Best offers by airline: London → Seattle
Based on 200 offers · July 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: London → Seattle
Add-on pricing from the cheapest available offer per airline · July 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| Aer Lingus | Included | — | — |
| British Airways | Included | — | — |
| Alaska Airlines | Included | Included | — |
| American Airlines | Included | USD 145 | — |
| Finnair | Included | USD 190 | — |
| Iberia | Included | — | — |
Fees are estimates from the prices we checked and may not reflect your specific itinerary, booking class, or payment method. Run a live search for exact pricing.
How much do flights from London to Seattle cost?
Based on 200 offers · July 2026
London to Seattle flights ranged from USD 785 to USD 1191 across 200 offers analyzed in July 2026. The chart below shows how prices distributed across all 200 offers.
These 200 offers (July 2026) span multiple departure dates and booking windows — your travel dates may fall anywhere in this distribution. Only a live search shows where your specific trip lands.
50% of offers priced between USD 881 and USD 1020
What hidden fees do London to Seattle flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on London to Seattle routes. The breakdown below is based on 200 offers analyzed in July 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| EI | 8 | 1% |
| BA | 100 | 10% |
| AS | 10 | 1% |
| AA | 155 | 16% |
| AY | 108 | 11% |
| IB | 12 | 1% |
American Airlines: base ~USD 847 + fees USD 155 = ~USD 1002 total. Aer Lingus: base ~USD 1081 + fees USD 8 = ~USD 1089 total.
American Airlines's USD 155 ancillary fees narrow the gap with Aer Lingus's lower-fee model — the USD 234 base difference shrinks to USD 87 after fees. Always compare total cost, not just the advertised base fare.
Estimates based on median total minus average ancillary fee. Actual base fares vary by itinerary.Fee levels vary significantly across carriers on this route — some carriers charge 50%+ above the base fare in ancillary fees.
Run your search to see itemized fees for your itineraryWhich airline is cheapest from London to Seattle?
8 airlines flew London to Seattle in this dataset. Knowing the airline isn't enough — the typical fare range below shows how far prices swing on each one. Median and range include all fees we recorded.
| Airline | Offers | Typical range (USD) | Median (USD) | Fees (USD) |
|---|---|---|---|---|
 Alaska | 2 | — | 836 | n/a |
 Alaska Airlines | 14 | 825–1016 | 857 | 10 (1%) |
 British Airways | 4 | 817–927 | 872 | n/a |
 British Airways | 108 | 855–1075 | 932 | 100 (11%) |
 Finnair | 57 | 896–1049 | 986 | 108 (11%) |
 American Airlines | 6 | 844–1020 | 1002 | 155 (15%) |
 Iberia | 5 | 965–1057 | 1032 | 12 (1%) |
 Aer Lingus | 4 | 847–1190 | 1089 | 8 (1%) |
Where do the best London → Seattle prices come from?
We checked direct airlines, travel agencies, and meta-search for this route. On this route the lowest median came from travel agency sources, but the cheapest channel shifts by route and date — which is exactly why a live search across all of them wins.
We compare every airline and the major booking sites but never disclose which — that's our edge. Prices are the ones we observed and aren't official data from any platform. Run a live search and we bring you the cheapest, wherever it is.
Key facts: London to Seattle flights
- London–Seattle had 200 offers analyzed. Median price: USD 962.
- AA charges 19.4x more in ancillary fees than EI — USD 155 vs USD 8 avg per booking.
- The same route priced USD 321 apart depending on where it was booked — the lowest median was USD 836. We search every airline and the major booking sites at once so you always see that lowest price.
Frequently asked questions
- How much does a flight from London to Seattle cost?
- Based on 200 offers analyzed, London to Seattle flights range from USD 785 to USD 1191, with a median price of USD 962. Search for your specific dates →
- What hidden fees should I expect on London to Seattle flights?
- On average, ancillary fees (bags, seat selection) add USD 93 to the base fare on London to Seattle flights. See itemized fees for your itinerary →
- Which airline is cheapest on London to Seattle including all fees?
- Alaska has the lowest median fare on London to Seattle at USD 836 (median across 2 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest London–Seattle flights?
- It depends on your dates — no single site is always cheapest. We search every airline and the major booking sites at once (travel agencies and meta-search included) and surface whichever is lowest; the best median in this snapshot was USD 836. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on London to Seattle routes?
- London to Seattle has 8 airlines competing, creating a price range from USD 785 to USD 1191 across 200 offers. Prices on this route change with booking timing, advance purchase, and ancillary add-ons. Find where your trip lands in the distribution →
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