flight sales

Hi all,
I stumbled across this fantasic website accidently when trying to find out information on flight sales or pricing strategies and now I am totally hooked! Lots of excellent information.
I have made a promise to myself and my girlfriend to try and travel a bit more before we settle down and hopefully we will be able to do so on our limited budget. I have already got some great deals flying from the north west of England and one of the places I would like to go is Riga/Latvia. It seems that the flights have only recently been released for April 2012 onwards. I am looking to travel between April - June from either Liverpool or Leeds/Bradford but at the moment the prices seem really expensive £180 + for a return flight for this period. If I wanted to travel in the next few weeks then the flights are a far more reasonable £60-£80 but unfortunately I can't take the time off work
Can anyone shed any light on when sales, prices may go down based on past trends/insight or even guess work? I am prepared to wait but if the prices are likely to go up then I will have to choose somewhere a bit cheaper.
I realise I am probably asking the impossible but any advice/guidance any of you good people can offer, I would be extremely grateful

Thanks in advance, Carlos

no, it's not that complicated prices will go down, don't worry. best to book a flight ist between 2 weeks and 2 month befor departure (in your case likely 1-2 month). so, if you like to fly in april you can start to check prices in february, march. this does not apply for special hollydays, of course. don't expect 10 Pound offers on this route, as it's a long rout, but a price for around 20pounds one way you'll find easily if you are a bit flexible so, stay calm and wait! And then have fun :-D
and if you asks for the source of what I wrote: My bachelorthesis :-D

I would recommend to frequently go on the Ryanair website and have a look at the fares for your preferred destinations.
The best fares are likely to be about two months before the date.
At the moment, promotional fares are for travel in December and January...
Warning : it's not easy to get the very lowest fare - if you wait too long for it, the price may well rise instead ! My advise is : book when you judge that the bargain is good.