Despite the fact that you can claim for your dropped or postponed flight remuneration however there is a certain time limitations. How far back you can guarantee changes according to the countries. Sometimes , if your flight was dropped or deferred by at 3 hours, you can get up to 600€ in pay from the carrier.
How far back can you claim for delayed flights?
You may have heard that claims for flight compensation must be made inside two years of the occasion in the UK however this isn't the case. In the past, when drawn closer legitimately, airlines would consistently turn down cases for flight pay that were more seasoned than two years, guaranteeing that the Montreal Convention of 1999 gave carrier travelers in England and Wales only two years to bring a case against them if their flight have been dropped or significantly postponed.
Nonetheless, this was challenged in court and in 2014 and a decision was made that travellers in England and Wales would really have as long as six years following the flight date to get a flight compensation according to the Section 9 of the Limitation Act 1980. Be that as it may, in europe things are different. Here is a broad rundown of nations in Europe, with how far back you can guarantee for every one of them:
 
·        Austria: 3 years
·        Belgium: 1 year
·        Bulgaria: 3 years
·        Croatia: 2 years
·        Cyprus: 6 years
·        Czech Republic: 3 years
·        Denmark: 3 years from the date of takeoff
·        Finland: 3 years
·        France: 5 years
·        Germany: 3 years
·        Greece: 5 years
·        Hungary: 5 years
·        Iceland: 2 years
·        Ireland: multi year
·        Italy: 2 years
So every nation has their own enactment on the matter. However, remember that till now, no passengers got their compensation if the time limit crosses more than 6 years. If your flight's deferred for a considerable length of time, your aircraft needs to give you food , drinks , access to calls , messages and accommodation too if the flight is postponed overnight.
Wrapping it up!
Contact the airline regardless of whether you booked it through a third party providers. The carrier's client administrations division will normally help. Be prepared to give all your flight subtleties and booking reference numbers. Compose your case and do tell them what turned out badly and what you need  from the airline as a compensation. Incorporate duplicates (not firsts) of your tickets and any receipts.
Keep records of your case and any reaction from the company. Take notes on the off chance that you address anybody from the carrier as this could be valuable in the event that you choose to take your case further. There are many lawyers in the UK to help you in your Flight Delay Claim. And it is advisable to contact these lawyers as they are experienced in their fields and know what exactly you need to file a successfull claim. Although can do it by yourself but you will face issues as you dont have a complete knowledge of legal technicalities.