If they’re not the cheapest option, try searching by month to compare costs throughout the week.
When you fly from Doncaster to Seattle, you'll have zero airlines to choose from for your 7495 km journey. If you're planning to fly in peak season, make sure you book in advance to get a reasonable price. Or you could hold on and try to get a last-minute bargain.
To sort cheap flights to Seattle, it's best to start searching for flights by month, as this will show you when prices are at their lowest.
Make sure you check what refreshments or meals are included, so you can plan your journey. Before you book, why not check out our hotel and car hire options? We have some hotels close to the airport – handy if you're arriving late at night, or flying back very early.