When traveling overseas (flying to Europe), on an economy class ticket, what is the cost to upgrade?

Question

what is the average cost to upgrade to first class?

what is the average cost to upgrade to business class?

Credible knowledge only please. and/or people with experience.

Answer 1

Need a lot more info, where are you travelling from and to, which airline, when.

You could work it out roughly for yourself, go online and price check economy/business/first and just work out the difference.

Answer 2

There are so many variables, it's hard to tell with any specificity. The closer you are to the departure date, the higher the fare ususally is. As a general rule, business class is approximately double the economy fare.  

Answer 3

Well, all the european airlines are pretty expensive for even buissness

Answer 4

Generally speaking, the price to upgrade PRIOR to 24 hours before flight day is the cost difference between the two tickets, usually several thousand dollars.

In the rare event that all first or business class seats are not sold and/or given to frequent flyers, sometimes the airlines will make them available at check-in, or the gate desk, on day of flight.  The price will vary greatly depending on volume.

For example, I had to make 2 trips to London, via British Airways.  On the first trip out, I was able to upgrade to BC for $400 one way.  On the second trip, SAME flight, purchased same time as flight #1, the upgrade was $1200.  

Basically, there's no 'rule', but unless your coach ticket is full fare, it's not going to be cheap.