United flights from Helena to Porto from $ 821* or from $/mo
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Featured daily fares for flights from Helena (HLN) to Porto (OPO)
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More United deals on Helena (HLN) to Porto (OPO) flights
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From | To | Fare Type | Dates | Price |
|---|---|---|---|---|
| Helena (HLN) | Porto (OPO) | Roundtrip | Economy | 08/08/25 - 08/22/25 | from $ 821 Viewed: 43 minutes ago |
| Helena (HLN) | Porto (OPO) | Roundtrip | Economy | 08/07/25 - 08/21/25 | from $ 841 Viewed: 43 minutes ago |
| Helena (HLN) | Porto (OPO) | Roundtrip | Economy | 08/05/25 - 08/19/25 | from $ 861 Viewed: 43 minutes ago |
| Helena (HLN) | Porto (OPO) | Roundtrip | Economy | 08/06/25 - 08/20/25 | from $ 866 Viewed: 43 minutes ago |
| Helena (HLN) | Porto (OPO) | Roundtrip | Economy | 08/09/25 - 08/23/25 | from $ 931 Viewed: 43 minutes ago |
| Helena (HLN) | Porto (OPO) | Roundtrip | Economy | 08/05/25 - 08/12/25 | from $ 946 Viewed: 43 minutes ago |
| Helena (HLN) | Porto (OPO) | Roundtrip | Economy | 08/06/25 - 08/13/25 | from $ 946 Viewed: 43 minutes ago |
| Helena (HLN) | Porto (OPO) | Roundtrip | Economy | 07/22/25 - 07/29/25 | from $ 946 Viewed: 43 minutes ago |
| Helena (HLN) | Porto (OPO) | Roundtrip | Economy | 07/09/25 - 07/16/25 | from $ 946 Viewed: 43 minutes ago |
| Helena (HLN) | Porto (OPO) | Roundtrip | Economy | 07/15/25 - 07/29/25 | from $ 946 Viewed: 43 minutes ago |
*Prices have been available for round trips within the last 48 hours and may not be currently available. For Economy class, fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply.
