If you want a cheap flight from Glasgow to Moscow, you've got two airlines to choose from.
Moscow Domodedovo Airport is just one of the airports in Moscow. If you're not set on a specific airport, try changing your search from Moscow Domodedovo Airport to Moscow to see a broader range of flights – they might be cheaper. It usually takes about 7 hrs 15 mins to fly 2618 km to Moscow Domodedovo Airport.
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.