It is not directly directed to your question but low-cost carrier prices can fluctuate on the weekly basis with the lowest price appearing usually on Tuesday or Wednesday. Prices around Holidays can get a high starting prices and get lower later. However predicting it is always a matter of experience.
I recently discovered a service called TripIt Pro, which among other things
offers a fare watcher service. Once you upload your itinerary (including flight numbers), TripIt Pro will watch for lower fares and alert you if a newer fare is low enough that even with the penalty for changing your ticket, you still save money.
FD: I haven’t signed up with TripIt Pro yet, although I do have a free account (the pro account has a 30-day free trial, so I’m waiting until I can get the most value from it).
A similar question has been asked some time ago, and an excellent answer has been given. All this can be summarized as follows:
Credit:stackoverflow.com‘
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