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Re:I booked my cheapest one-month trip by throwaway823882 on Thursday April 29, 2021 @12:38PM (#26983325)
Google Flights does this for you. It can both show you actual prices per calendar month, and predicted price rise/fall. It even highlights the lowest price dates. And you can sign up for e-mailed price alerts.
Re:I booked my cheapest one-month trip by pudmaidai on Thursday April 29, 2021 @01:44PM (#26984148)
Sigh downvotes on HN.

This is correct. Google Flight is amazing at tracking flight prices over time and lets you see dips in the past on a readable chart.

Something that they could make easier would be to forecast exact price changes based on the same flight flight on other dates.