How often will you be flying as this could turn into an expensive exercise.
If flying a lot you will be best off with a hard case. They range in price from a couple of hundred quid for one of these
https://www.probikekit.co.uk/cycling-accessories/pbk-bike-travel-case/11437202.html
To a whole lot more for one of these
https://www.buxumbox.com/
I have the PBK one, it has been on planes and trains, it is good and has protected the (steel) bike well, but has a couple of minor niggles: the anti-crush struts are a pain to pack around and the wheel skewers need to be attached and spaced carefully.
That is expense number one.
Next up, a case that size is usually special baggage on a plane and that can cost around £40-£50 pounds each way.
After that there is getting the blessed thing to and from the airport, From the airport is less difficult, but getting there can be fun French taxi drivers (well Parisian ones) are not well disposed to cases that size "But I am not allowed to drop the rear seats" .
Trains are usually okay but buses and underground can be "interesting"
This is not to discourage you but to say that there are a number of factors that come into play and you need to weigth them all up
If you really want a road bike them, a Ritchey breakaway of something with S&S couplers would bring you back into normal hold baggage size. I have the breakaway system on an old Dahon Tournado and it is a lovely bike to ride
https://eu.ritcheylogic.com/eu_en/break-away-road-frameset
