Norwegian is a decent airline too. Flown with them to New York, very pleased with the standard.Probably, but with some legwork and flexibility surely it's possible. For instance, Google tells me that you can buy flights on Norwegian round trip between LGW to OAK for under $700 USD (surely under £600?; no taxes and fees) from August 3 (Thursday) to 12 (Tuesday). BA/Finnair is just above $800 USD for the same ticket.