If you want a cheap flight from Manchester to Moscow, you've got two airlines to choose from.
Moscow Vnukovo Airport is just one of the airports in Moscow. If you're not set on a specific airport, try changing your search from Moscow Vnukovo Airport to Moscow to see a broader range of flights – they might be cheaper. It usually takes about 12 hrs 20 mins to fly 2533 km to Moscow Vnukovo Airport.
There are about 50 flights to or via Moscow every week, so you have plenty of options.
During this peak season, accommodation prices often increase too, so it's best to book early. Or you could keep your fingers crossed and hold out for a last-minute deal.