Maybe. Loads of free seats on seat map but that doesn't mean people haven't booked.
Around £700 to £800 for sams dates next year.
I guess the question is, when does "budget" cease to be budget?
That’s entirely normal, even for the dates next year. It’s not at all reasonable but it is what it is, most airlines do it. You should see the prices BA often charge for their domestic flights on an ASLEF strike day, it’s comparable.
Another possibility now I think of it is that those specific flights might be associated with one of their package holidays. The package holidays are more profitable than flight only passengers so it could be that they’re deliberately pricing flight only passengers off those flights with the hope of filling them with people taking up the package holiday.
These days Jet2 is a package holiday company first and foremost, it wouldn’t surprise me if they only bother with the budget airline bit when they can’t fill the plane with package holiday customers alone.
I flew to Salzburg with Jet2 for £30 earlier this year so they do sometimes do cheap flights.