Unfortunately the ba sale just ended, I bought tickets during the sale for 2200, jet blue is somewhat deceptive in my experience because they get you on the fare for the return, in general the cheapest fare you will see will be about 2000, cheapest easy to find fare 2500, cities with the most service tend to be cheapest, United runs one flight out of Boston which at times can be cheap, the flight times aren’t great, United has a limited presence in Boston, but ny and Boston both have a lot of London service so you can normally find a flight for 2500, days if the week can matter Tuesday tends to be cheaper, Newark is going to be pricey because minus one ba flight it is United and they price up, if you are only going one way you will pay more,