Wizz Air is currently offering very low fares from London (Luton) to its home airport of Budapest. The cheap fares are widely availability, and prices start at £25.99 one way (£17.49 one way if you’re a member of the Wizz Discount Club, which is well worth joining).
The £25.99 (£17.49) fare is available from Luton to Budapest throughout September and October, and in the return direction throughout October. As such, a flight towards the end of September, returning in October, can easily be had for £34.98. There really are plenty of these fares available at the time of writing so this offer is worth looking at.
These discount flights can currently be combined with the ongoing sale at the impressive Hilton Budapest, which is currently as low as €115 per night in September/October 2014. You can also get double or triple Hilton HHonors points on any stay at this hotel, and will get a further 2500 bonus HHonors by signing up via this link.