We are flying from Manchester to France (well, via Geneva) and we will definitely be taking our own suncream:
DS only uses powder mineral suncream on his face and only uses solid suncream on his body.
I can only use about 3 brands on my face (which does include the powder version) and need all-day suncream or I burn like crazy (even if I reapply).
DH and DD prefer all-day suncream and P20 or Ultrasun are crazily expensive unless you buy them on offer or in TK Maxx.
We are taking hold luggage, and this will mean we can put larger bottles of P20/Ultrasun in these (Manchester is still 100ml).
I have yet to find any of the brands DS and I use on our faces in another country (though France I know is good for facial skincare, I have also had a reaction to at least one French brand of so-called sensitive facial suncream).
I have also never seen the all-day versions in any European country, other types are very expensive in resorts (we won't have a car so won't be able to go to Lidl/Aldi/out of town supermarkets), and last I checked the all day versions were actually banned in the US (supposedly because they don't last the number of hours stated on the bottle, but they could easily just say "4 hour" instead of "8 hour").
When we go for 2 weeks we sometimes order things from local Amazon that have broken/we've forgotten, to a dropbox, but for a week or 10 days it's not worth it.
Also, don't mock the OP for not understanding what airlines vs. airports can allow. Airlines and airports have, for example, different policies on sharps, and you can have things taken off you by the airline if it doesn't meet their stricter rules.