cheap flight from london

it is much cheaper for me to fly in and out of London.

To which airport? London-Heathrow?
The most budget flights depart from London-Stansted. Here you should actually find much better deals than 65 bucks. However Stansted is on the opposite side of London. Transfer is neither fast nor cheap.

budget flights from London-Stansted

Do you think I can wheel and deal if I will will take anything once I am in London?

Will get mostlikely more expensive this way. Esp. budget airlines tend to be much more expensive if you book last minute.

Even "cheap flights" have a mix of very cheap seats and high priced ones. Guess which are left a few hours and days before.
If you prebook then remeber that if you are delayed and do not make it then the ticket is lost.
If you end up having to buy a full price ticket then a 1 hours fligt in Europe may easily cost more than your transatlantic one!
There is a reason that flight to/from London are cheaper -that compensates for the costs of getting to any other place.
It generally ends up cheaper (and much more convenient) to get your ticket to your actual destination (chose one of the big hubs if you can: Amsterdam, Frankfurt, Paris, or maybean "alternative" to these like a direct flight to another German airport.
Evne a connection over London continuing on a flight on the same ticket may end up cheper in total - and then there is no risk if delayed for the continuing flight.

Why not Franfort, or Munich or Madrid?

http://www.kayak.com
They check 172 airlines. With password, they give a choise of up to three days b4 or after your 1st choise date.

They email updates.

Good luck!
Have a slooowwww trip. You'll gain more.

Ryanair may claim that its £5 to Brussels or Toulon but by the time you've added on taxes, charges and a fee for checking in luggage it'll come to £30 at least.

#6 don't forget the forthcoming "toilet charge" where, at time of booking, you have to book how many number ones & twos you are going to have inflight with no refunds if you don't use them and you can't share them with another passenger

However, if you do it this way you'd get London thrown in "for free". Or: If you save a lot by flying via London you can spend it all there.

If you were planning to go to London anyway (or think: why not?) why not. Also: If you get a "taxes+fees only" flight to Portugal and return the same way from Poland you don't need to backtrack on your train journey. But: Bok these flights before you live, so it is all stictched up and watertight before you leave.