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Cheap flights from Ontario (ONT) to Porto (OPO)

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How to find the cheapest flight from Ontario (ONT) to Porto (OPO)

How to find the cheapest flight from Ontario (ONT) to Porto (OPO)
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How to find the cheapest flight from Ontario (ONT) to Porto (OPO)
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How to find the cheapest flight from Ontario (ONT) to Porto (OPO)
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Cheap flights from Ontario to Porto in August , September 2026

25 Aug - 24 Sep $ 1,113.00
ONT
Ontario
Frontier Airlines
3 STOPS
OPO
Porto
OPO
Porto
Frontier Airlines
3 STOPS
ONT
Ontario
Pick dates
31 Aug - 24 Sep $ 1,211.00
ONT
Ontario
Frontier Airlines
3 STOPS
OPO
Porto
OPO
Porto
Frontier Airlines
3 STOPS
ONT
Ontario
Pick dates
31 Aug - 10 Sep $ 1,291.00
ONT
Ontario
Frontier Airlines
2 STOPS
OPO
Porto
OPO
Porto
Frontier Airlines
2 STOPS
ONT
Ontario
Pick dates

Last minute flights from Ontario to Porto

25 Aug - 01 Sep $ 1,350.00
ONT
Ontario
Volaris
3 STOPS
OPO
Porto
OPO
Porto
Volaris
3 STOPS
ONT
Ontario
Pick dates
25 Aug - 01 Sep $ 1,366.00
ONT
Ontario
Volaris
3 STOPS
OPO
Porto
OPO
Porto
Volaris
3 STOPS
ONT
Ontario
Pick dates
25 Aug - 01 Sep $ 1,442.00
ONT
Ontario
Frontier Airlines
3 STOPS
OPO
Porto
OPO
Porto
Frontier Airlines
3 STOPS
ONT
Ontario
Pick dates

One-way flights to Porto from Ontario

7:00 AM - 6:50 PM
United Airlines
2 Stops
15h 55m
ONT - OPO
$ 697
Kiwi
Pick dates
6:08 AM - 6:50 PM
United Airlines
2 Stops
16h 47m
ONT - OPO
$ 700
Kiwi
Pick dates
7:00 AM - 6:50 PM
United Airlines
2 Stops
15h 55m
ONT - OPO
$ 757
Kiwi
Pick dates

How to find the cheapest flight from Ontario (ONT) to Porto (OPO)

Related info for your journey
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How to find the cheapest flight from Ontario (ONT) to Porto (OPO)
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How to find the cheapest flight from Ontario (ONT) to Porto (OPO)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.