Sweet fares to London. For folks flying out of Seattle, the prices from two days ago are now about $100 cheaper if you don't mind a stop en route.
The cheapest available fares are basic economy, which means early seat selection and a checked bag are not included. For most routes, it costs $60 each way to upgrade to regular economy, which includes a checked bag and early seat selection. A checked bag costs $60 each way à la carte on all airlines.