Low-cost airline Ryanair comes with offers for very cheap return flights from Vienna, Austria to Faro, Portugal. Prices are as low as $23! That works out to a cost of just about 0.79 Cents (Pence) Per Mile flown.
The fare only includes carry-on luggage, so you will need to pay extra if you want to check-in bags. This is a direct flight and the flight time is of about 3 hours and 30 minutes.
Prices are fairly low all through the summer, but August seems to have the most dates with good prices. Here is a sample itinerary in mid-August (Aug 14 – Aug 20):