Economy fares · SEA to LON
Our last fare check on this route was Oct 16, 2026, so its prices may have changed. Search below for today's fares.
Photo of Seattle, where this route departs: Seattle skyline with the Space Needle and Mount Rainier, seen from Queen Anne Hill. Daniel Schwen, CC BY-SA 4.0, via Wikimedia Commons, cropped; the crop is shared under the same licence.
Distance
4,786 mi
SEA to LHR, straight line
Nonstop
Seen
in our Oct 16 check
Airlines seen
3
DL, FI, VS
Fare checks
3
since Sep 24, 2026, latest Oct 16
Airlines like United Airlines and Air Canada fly from Seattle to London, typically offering one-stop routes. Comparing the live fares shown above helps you understand what drives the cost before you book.
From 10 real fares found in our latest check. Prices are per person and can change.
10 real fares from our latest check, cheapest first. Prices are per person and can change until ticketed.
FI
1 stop · 12h 15m · Mon, Nov 30
FI
1 stop · 20h 55m · Mon, Nov 30
VS
Nonstop · 9h 50m · Mon, Nov 30
DL
Nonstop · 9h 50m · Mon, Nov 30
FI
1 stop · 20h 55m · Mon, Nov 30
Current data shows United Airlines and Air Canada operating on this route. These flights involve 1 stop before arriving in London. Depending on the connection time, total travel durations range from 13 hours and 35 minutes up to 20 hours and 10 minutes.
Fares tend to be lower in late autumn and early winter, specifically around November and January. The holiday season in December usually sees a spike in demand, driving current pricing higher. You can track this monthly pattern by checking the live fares shown above.
Being flexible with your departure and return dates is a practical way to manage costs. Comparing different 1 stop itineraries across carriers can also reveal price differences. Booking several months ahead gives you a broader range of schedules, allowing you to secure a standard fare before availability tightens.
Recent searches did not find nonstop flights on this route. The available options all feature 1 stop, which brings the total journey time to between 13 hours and 35 minutes and 20 hours and 10 minutes. A longer layover will extend your travel day but can sometimes offer a more budget-focused ticket.
Our platform provides a live search to help you compare airlines and schedules without adding any booking fees. If you prefer speaking to someone, our travel advisors are available over the phone to assist you. This makes it simple to review all your options and make an informed decision based on the live fares shown above.
Recent data shows United Airlines and Air Canada flying this route. Both carriers operate itineraries with 1 stop.
Total travel times range from 13 hours and 35 minutes up to 20 hours and 10 minutes. This duration depends on the length of your layover, as all currently observed options include 1 stop.
Recent searches found no nonstop options. The current schedules show flights with 1 stop on carriers like United Airlines and Air Canada.
Late autumn and the winter months, such as November and January, generally offer lower pricing. Fares usually rise during December due to holiday travel demand.
Baggage rules vary widely between United Airlines and Air Canada. Check the airline's baggage allowance before booking to understand what is included in the live fares shown above.
Securing your ticket a few months in advance gives you access to a wider range of standard economy fares. Booking late often means fewer choices and higher pricing.
Return tickets generally offer better value than booking two separate one-way fares on international routes. Review the live fares shown above to compare the current pricing for both options.
Factors like advanced booking timelines and the day of the week drive the cost of premium tickets. For the economy options featured on this site, flexibility with your travel dates and choosing a 1 stop itinerary are the primary ways to manage your budget.
While travelers often search for British Airways when looking for premium cabins, recent budget searches on this route highlighted United Airlines and Air Canada. Check the live fares shown above to see which carriers offer practical economy options.
ASAirspace is built for travelers comparing economy fares rather than premium cabins. We focus entirely on the live fares shown above to help you find standard seating for your trip.
