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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 July , August 2026

30 Jul - 27 Aug $ 1,249.00
ONT
Ontario
Frontier Airlines
3 STOPS
OPO
Porto
OPO
Porto
Frontier Airlines
3 STOPS
ONT
Ontario
Pick dates
30 Jul - 26 Aug $ 1,255.00
ONT
Ontario
Frontier Airlines
3 STOPS
OPO
Porto
OPO
Porto
Frontier Airlines
3 STOPS
ONT
Ontario
Pick dates
30 Jul - 27 Aug $ 1,261.00
ONT
Ontario
JetBlue Airways
3 STOPS
OPO
Porto
OPO
Porto
JetBlue Airways
3 STOPS
ONT
Ontario
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Last minute flights from Ontario to Porto

30 Jul - 01 Aug $ 1,990.00
ONT
Ontario
Frontier Airlines
3 STOPS
OPO
Porto
OPO
Porto
Frontier Airlines
3 STOPS
ONT
Ontario
Pick dates
30 Jul - 01 Aug $ 2,039.00
ONT
Ontario
Frontier Airlines
3 STOPS
OPO
Porto
OPO
Porto
Frontier Airlines
3 STOPS
ONT
Ontario
Pick dates
29 Jul - 01 Aug $ 2,087.00
ONT
Ontario
Frontier Airlines
2 STOPS
OPO
Porto
OPO
Porto
Frontier Airlines
3 STOPS
ONT
Ontario
Pick dates

One-way flights to Porto from Ontario

6:10 AM - 9:40 PM
United Airlines
2 Stops
19h 35m
ONT - OPO
$ 695
Kiwi
Pick dates
6:10 AM - 6:50 PM
United Airlines
2 Stops
16h 45m
ONT - OPO
$ 698
Kiwi
Pick dates
6:10 AM - 6:10 PM
United Airlines
2 Stops
16h 5m
ONT - OPO
$ 701
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)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
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.