Route guide

Cheap Flights from San Francisco to London

Compare live fares, then book straight with the provider — EAZAIR never adds a fee.

San Francisco to London flight insights

Average flight time

10h 15m

SFO → LHR

Cheapest month

February

Based on cached fare history

Cheapest cached price

$329

Checking live fares…

Last checked Sep 10, 2026

Planning a trip from San Francisco to London? The average flight time on this route is 10h 15m. The lowest fare we have cached for this route is $329 (last checked Sep 10, 2026). February is the cheapest month recorded for this route in our cached fare data.

Route Quick Facts

Quick facts for flights from San Francisco to London on Eazair
Origin	San Francisco (SFO)
Destination	London (LHR)
Average Flight Time	10h 15m
Cheapest Month to Fly	February
Current Lowest Fare	$329
Fares Last Checked	Sep 10, 2026

Flight deals from San Francisco to London

Compare flight deals from San Francisco 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 San Francisco

Frequently asked questions

How long is the flight from San Francisco to London?

The average flight time for this route is 10h 15m. Itineraries with a connection usually run longer depending on layover length and airline.

What is the cheapest month to fly to London?

February is the cheapest month recorded for this route in our cached fare data. The lowest fare we have cached for this route is $329 (last checked Sep 10, 2026).

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.