Cheap Flights from Seattle (SEA) to London (LON)

Top tips for finding a cheap flight from Seattle to London

Finding cheap tickets from Seattle to London is easy with a little flexibility. Use our Whole Month search feature to scan through the calendar for the cheapest dates. You can also set up a Price Alert for your route and let us monitor the fares for you, sending notifications when prices change. If you’d rather skip layovers, select the Direct Flights search to view non-stop options that’ll save you time.

Booking your tickets early often leads to savings, but we can also find you some last-minute deals. In general, January is the best time to schedule your trip from Seattle to London, with the lowest average fares across the board. Keep these strategies in mind to find the best itinerary.

Handy information about Seattle airport

Seattle has three airports connecting travelers to the rest of the world. Lake Union is a small, specialized airport that caters mainly to private and business aircraft, with one terminal and various transportation options available depending on personal arrangements. Meanwhile, Seattle-Tacoma International stands as the primary gateway for both domestic and international travelers, featuring a main terminal complemented by several concourses and a myriad of transportation links that include shuttle buses, light rail, and more. Lastly, Boeing Field, or King County International Airport, operates one passenger terminal, and although it primarily supports general aviation, it offers some commercial passenger flights, including a limited selection of international services. Each airport offers unique facilities and connectivity to suit the varied needs of their passengers.

London airport: good to know

London serves as a true global gateway with six airports managing a spectrum of international and domestic flights. The centrally located London City Airport, notable for its single terminal, primarily focuses on domestic and European flights tailored for business travelers, while also offering a few transatlantic routes. It presents various transport options including the Docklands Light Railway, enhancing its accessibility.

Heathrow, the UK's largest airport, operates from four terminals offering comprehensive international connections. You'll find a multitude of transportation channels like the Heathrow Express and the Piccadilly Underground line that provide direct access to and from the heart of the city. Similarly, Gatwick, with two terminals, and Stansted, with one, both offer a range of flights, including low-cost options, and direct train routes into London. Luton, also facilitating primarily budget carriers from its single terminal, connects travelers to London via its nearby train station. Lastly, Southend Airport completes the set with links into the city, chiefly serving domestic and European airlines. Plan your airport transfer ahead of your flight from Seattle to London for a stress-free trip.

Best time to fly from Seattle to London

The best time to fly from Seattle to London is during the warmest months, July and August, when you can enjoy average temperatures of a comfortable 59°F to 77°F. Although rare heatwaves may push temperatures to around 86°F, the weather is generally mild, perfect for sightseeing and enjoying the city's outdoor attractions. Despite London's reputation for rain, these summer months offer a pleasant climate for your visit, with longer daylight hours to explore. Remember to pack light layers for the evenings and a raincoat for sporadic showers, ensuring a delightful experience in one of the world's most storied cities.

Reasons to visit London

When planning your trip to London, check out these activities and attractions London has to offer. Dive into the rich tapestry of history and culture at The British Museum, which houses a vast collection of world art and artifacts. Revel in the royal heritage with a visit to The Tower of London, where the Crown Jewels and storied past await your discovery. For panoramic views of the city skyline, a flight on The London Eye provides a memorable perspective. Time your visit to coincide with the Notting Hill Carnival, one of the world's largest street festivals, to experience London's celebration of Caribbean culture.

Add hotel bookings and car hire to your Seattle to London flight

Planning your trip to London is easy and convenient with Skyscanner. Find car rentals with reputable services like Green Motion, Europcar, and Hertz. These options allow you to explore the city on your own schedule. For accommodations, choose from hotels such as Park Plaza Westminster Bridge London, close to iconic landmarks, the Sofitel London Heathrow for immediate airport access, or the Premier Inn London Heathrow Airport T2 & T3 on Bath Road for a restful stay.