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.
UA
1 stop · 20h 10m · Fri, Oct 30
UA
1 stop · 18h 40m · Fri, Oct 30
UA
1 stop · 13h 35m · Fri, Oct 30
UA
1 stop · 17h 35m · Fri, Oct 30
AC
1 stop · 13h 35m · Fri, Oct 30
Lowest fare we found for each month we checked. Based on real searches, not a forecast.
Cheapest month found: Nov 2026 from $781
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.
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