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This came as a bit of a surprise as we thought that they had given up on publishing the full year in advance. Recently you only found out 355 days in advance, when tickets came up for sale, whether a day would be peak or not. Releasing the full year makes planning a lot easier.
There are substantial differences between the two calendars. Especially when travelling during school holidays on a route served by both by BA and Iberia, it may well be cheaper to book on Iberia.
If, for example, you want to travel on British Airways in April 2018, you will be paying the peak Avios price until 15th April. However, if you look at the Iberia calendar, you can see that their peak prices only start towards the end of the month and 1st-26th April is off-peak. (Easter Sunday is 1st April in 2018.)
There are also differences around February half-term. For example, Saturday 10th February is peak for BA and off-peak for Iberia. On that day, a Club World return from London to New York would be 120,000 Avios. In comparison flying from Madrid to New York would be only 68,000 Avios. The tax would also be £369.44 lower on the Iberia ticket as long as you book it via the Iberia website (£528.65 v £159.20).
The summer holidays peak season starts earlier on Iberia (22nd June) and ends only two days before BA which means you won’t be able to save much here.
The days around Christmas are also interesting as BA sees the full second half of December as a peak travel time whereas Iberia has got a couple of off-peak dates the week before Christmas and before New Year.
British Airways calendar: (blue=peak, green=off peak / click to enlarge if necessary)
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