Can you upgrade a BA flight with Avios at the airport?

[eesoterik]

We have a reward flight booking. There is now room in the cabin above to book as a reward flight. Are we able to upgrade to that cabin at the airport, using avios?

No. Only cash at the airport if airport upgrades are available. Just call BA Exec Club instead to upgrade with Avios. Even if that means from your mobile in the airport itself.

Saying that, not sure if you can Avios upgrade once the airport take control of the flight (usually 24 hours-ish in advance) so best to call sooner rather than later while the seats still show as available.

Ah but if we call up BA we have to pay the £35 per person change fee, even though we’re paying them more!

Well then you don't get to upgrade with Avios if you won't call them. They're not psychic. And they can't do it at the airport. You can ask if they have any cash upgrades when you check-in but there's no guarantee they will or that you'll like the price they want.

OP says in her first post that she has a reward booking and now wants to try and upgrade that reward booking using more Avios to the next cabin.

You cannot upgrade using Avios at the airport.

You have to call, we’ve just done this. You can also only upgrade one class I think, so economy to premium or premium to club.