O'Hare International (ORD) to Humberto Delgado (LIS).
| Departure | Return | Price |
|---|---|---|
| 08/05/2026 | 08/11/2026 | $953 |
| 08/05/2026 | 08/13/2026 | $953 |
| 07/05/2026 | 07/14/2026 | $964 |
| 07/07/2026 | 07/13/2026 | $965 |
| 08/05/2026 | 08/12/2026 | $966 |
| 07/05/2026 | 07/13/2026 | $967 |
| 07/06/2026 | 07/13/2026 | $967 |
| 07/06/2026 | 07/14/2026 | $967 |
| 07/06/2026 | 07/15/2026 | $967 |
| 07/07/2026 | 07/14/2026 | $967 |
Based on current fares, August is the cheapest month to fly from Chicago to Lisbon, with average fares around $967 round trip (as low as $953).
May tends to be more expensive, averaging $1272.
See the full month-by-month and day-of-week price analysis
Best Time to Fly ORD → LISDeparture date prices (economy, round trip). Green = cheap, red = expensive.
The cheapest month to fly from Chicago to Lisbon is August, with average round-trip fares around $967. Fares in August start as low as $953. The most expensive month is May, averaging $1272.
A nonstop flight from Chicago to Lisbon takes approximately 8h 30m.
The cheapest flight from Chicago to Lisbon currently starts at $953 round trip in economy class.
The average round-trip flight price from Chicago to Lisbon is $1170 in economy class.
The distance is 3958 miles (6368 km). with a nonstop flight time of about 8h 30m. The lowest fare currently available is $953 departing in August. The average round-trip fare is $1170.
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