I have not been happy with the timing of the alerts from google flight tracker. A few times, I was altered to a price drop after the price had dropped and already come back up. So, if you use it, I would still continue to check the airline’s website too.
I do like the flight tracker to see the history of the price changes. This lets me know if the current price is high or low.
Are you flying out of O’hare? I flew recently Chicago to London and my price was $921 on British Airways, which I consider to be a really good price for getting to Europe. Many of my flights have been in the $1500 range. These are all for economy. It seems we pay more the luxury of a nonstop flight.
If you are flying from O’hare, unless something has recently changed, your options for a nonstop to London are British Airways, American, and United.
I just booked my flights for my Sept. trip. If you see a price you can live with, I would book it now.
If you need a car service to get you to and from the airport, this is the one I use:
https://echolimousine.com/
They are very reliable. I’ve been using them for years now. My sister works for a large company and this is the service they use too. Indiana is within their service range.