$404 Cheap Delta flights San Francisco (SFO) to London (LHR)

Set the “Price (lowest to highest)” filter on Expedia to search for cheap Delta Air Lines return flights from $584 from SFO to LHR. Affordable one-way tickets from $404 are available too.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Look for one-way or return flights to London in January or February. You could find an affordable fare with Delta Air Lines during these off-peak travel months.

Start your search for Delta Air Lines flights from SFO to LHR about one month before you want to go. The most affordable time to reserve an international flight is generally 18 to 29 days ahead of your departure date when you can save 17% versus booking four to five months in advance. No matter your ticket type or itinerary, the best day of the week to book international airfare is usually Sunday. Friday is often the most expensive. Passengers who book on a Sunday can save an average of 17% compared to those who book on a Friday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

To see if there’s a direct route from SFO to LHR with Delta Air Lines or any other airlines, check the “Nonstop” filter when browsing for flights.

To find the earliest departures from SFO to LHR with Delta Air Lines, filter your search by “Morning” and “Early Morning.” Booking an early flight generally means you’ll experience fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Heathrow Airport (LHR) is the primary London hub for Delta Air Lines flights from San Francisco Intl. Airport (SFO).

Delta Air Lines makes flying from SFO to LHR more comfortable with a rewarding loyalty program and an excellent in-flight experience. You even have the chance to collect points with Delta SkyMiles. Remember to join Expedia’s free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future bookings.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

You can usually reschedule or cancel your flight, although there may be additional charges if you booked more than 24 hours ago. Need to keep your options open? Apply the “No cancel fee” or “Changes included” filter to find flights that won’t penalize you if you have to alter your plans. To make modifications, visit “Trips,” select your flight and click on “Manage Booking” for more details.