AirHint found the following cheapest return flights from Pittsburgh (PIT) to Lisbon (LIS) in May 2026 (see full year).
Return flights
| 09 May - 16 May | British Airways | ||
| 14 May - 22 May | SWISS | ||
| 28 May - 14 Jun | British Airways | ||
| 21 May - 30 May | Allegiant Air |
Also check the deals for one-way flights from Pittsburgh to Lisbon in May.
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