Route guide

Cheap Flights from Seattle to London

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Seattle to London flight insights

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Route Quick Facts

Quick facts for flights from Seattle to London on Eazair
Origin	Seattle
Destination	London
Average Flight Time	—
Cheapest Month to Fly	—
Current Lowest Fare	No fares available for this route right now.

Flight deals from Seattle to London

Compare flight deals from Seattle to London. We search hundreds of airlines and travel agencies to find you the best price. Fares on this route are refreshed live from our partner network, so the price you see is the price you follow through to the provider — EAZAIR never adds a fee.

View of London, a popular flight destination from Seattle

Airline baggage policies

Baggage allowances differ significantly between fare classes (Basic/Light vs. Standard/Flex) and can change over time. Always verify the exact allowance for your specific fare with the airline before you fly.

General airline baggage policy reference
Airline	Cabin bag	Checked bag
Delta Air Lines	1 carry-on + 1 personal item on most fares	1 checked bag typically included on Main Cabin and above; Basic Economy usually excludes it
American Airlines	1 carry-on + 1 personal item on most fares	1 checked bag typically included on Main Cabin and above; Basic Economy usually excludes it
United Airlines	1 carry-on + 1 personal item on most fares	1 checked bag typically included on Economy and above; Basic Economy usually excludes it
Southwest Airlines	1 carry-on + 1 personal item	2 checked bags included on every fare — a long-standing, well-known Southwest policy
JetBlue Airways	1 personal item on the cheapest (Blue Basic) fare; a carry-on is added on higher fares	Not included on Blue Basic; typically included from Blue Plus and above
Alaska Airlines	1 carry-on + 1 personal item on most fares	1 checked bag typically included on Main and above; Saver fares usually exclude it
Spirit Airlines	1 personal item included; a full-sized carry-on is a paid add-on	Not included on the base fare — a paid add-on at every fare tier
Frontier Airlines	1 personal item included; a full-sized carry-on is a paid add-on	Not included on the base fare — a paid add-on at every fare tier

Travel tips

Arrive early for domestic flights

TSA generally recommends arriving at least 2 hours before a domestic departure, more at larger hub airports during peak travel periods.

Pack a mixed carry-on

Keep a change of clothes, chargers, and any essentials in your carry-on rather than only your checked bag, in case of a delay or a bag that doesn't arrive with you.

Ease jet lag on longer routes

On longer cross-country flights, adjusting your sleep schedule a day or two before departure and staying hydrated in flight can reduce jet lag on arrival.

Screenshot your confirmation

Save a screenshot or PDF of your booking confirmation and boarding pass before you travel, in case you lose signal or battery at the airport.

Check in online when it opens

Most airlines open online check-in 24 hours before departure — checking in early can help with seat selection and, on some airlines, boarding group assignment.