Just my opinion, but those folks looking for 'good fares' need to check every day.
Also you need to rationalise in your own mind what is a good fare.
Sometimes the cheapest is not always based on what you consider a good or best fare.
Think about baggage allowances, flight changes, transfer times, flight times, confort and service.
Absolute price may mean total travel times that equate to 20 or 30 hours.
Please think carefully about your criteria.
Very cheap flight can be found, if that what you really want
As for us that's not our criteria.
Same for hotels too.
I've stayed in a £5 per night hotel and I actually prefer the £10 per night hotel![]()