$407 Cheap Flights from Dayton (DAY) to Porto (OPO)

View $407 flight on Sun, Jan 25, 2026Opens in a new window

Popular airlines from Dayton Intl. Airport (DAY) to Porto Airport (OPO)

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Cheap Flights from Dayton to Porto (DAY-OPO)

Prices were available within the past 7 days and start at $407 for one-way flights and $493 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Lufthansa
Sun, Jan 25 - Sun, Feb 1
DAY
Dayton
OPO
Porto
$493 Roundtrip, found 11 hours ago
$493
Roundtrip
found 11 hours ago
Select Lufthansa flight, departing Sun, Jan 25 from Dayton to Porto, returning Sun, Feb 1, priced at $493 found 11 hours ago
Brussels Airlines
Wed, Jan 14 - Thu, Jan 29
DAY
Dayton
OPO
Porto
$494 Roundtrip, found 4 days ago
$494
Roundtrip
found 4 days ago
Select Brussels Airlines flight, departing Wed, Jan 14 from Dayton to Porto, returning Thu, Jan 29, priced at $494 found 4 days ago
Delta
Mon, Feb 2 - Wed, Feb 18
DAY
Dayton
OPO
Porto
$498 Roundtrip, found 6 days ago
$498
Roundtrip
found 6 days ago
Select Delta flight, departing Mon, Feb 2 from Dayton to Porto, returning Wed, Feb 18, priced at $498 found 6 days ago
British Airways
Wed, Feb 18 - Wed, Mar 11
DAY
Dayton
OPO
Porto
$501 Roundtrip, found 2 days ago
$501
Roundtrip
found 2 days ago
Select British Airways flight, departing Wed, Feb 18 from Dayton to Porto, returning Wed, Mar 11, priced at $501 found 2 days ago
Lufthansa
Sun, Jan 25 - Sun, Feb 1
DAY
Dayton
OPO
Porto
$505 Roundtrip, found 11 hours ago
$505
Roundtrip
found 11 hours ago
Select Lufthansa flight, departing Sun, Jan 25 from Dayton to Porto, returning Sun, Feb 1, priced at $505 found 11 hours ago
Lufthansa
Sun, Jan 25 - Sun, Feb 1
DAY
Dayton
OPO
Porto
$508 Roundtrip, found 11 hours ago
$508
Roundtrip
found 11 hours ago
Select Lufthansa flight, departing Sun, Jan 25 from Dayton to Porto, returning Sun, Feb 1, priced at $508 found 11 hours ago
Iberia
Sun, Jan 25 - Sun, Feb 1
DAY
Dayton
OPO
Porto
$510 Roundtrip, found 11 hours ago
$510
Roundtrip
found 11 hours ago
Select Iberia flight, departing Sun, Jan 25 from Dayton to Porto, returning Sun, Feb 1, priced at $510 found 11 hours ago
British Airways
Wed, Jan 14 - Thu, Jan 29
DAY
Dayton
OPO
Porto
$512 Roundtrip, found 4 days ago
$512
Roundtrip
found 4 days ago
Select British Airways flight, departing Wed, Jan 14 from Dayton to Porto, returning Thu, Jan 29, priced at $512 found 4 days ago
Lufthansa
Sun, Jan 25 - Sun, Feb 1
DAY
Dayton
OPO
Porto
$514 Roundtrip, found 11 hours ago
$514
Roundtrip
found 11 hours ago
Select Lufthansa flight, departing Sun, Jan 25 from Dayton to Porto, returning Sun, Feb 1, priced at $514 found 11 hours ago
Brussels Airlines
Wed, Jan 14 - Thu, Jan 29
DAY
Dayton
OPO
Porto
$515 Roundtrip, found 4 days ago
$515
Roundtrip
found 4 days ago
Select Brussels Airlines flight, departing Wed, Jan 14 from Dayton to Porto, returning Thu, Jan 29, priced at $515 found 4 days ago

Alternative airports near Porto

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Dr. Francisco de Sa Carneiro OPO. Cheapest and Closest option available. Average driving time to city center is 14 minutes. Flights from $1,013
OPO
Dr. Francisco de Sa Carneiro
CheapestClosest
Average driving time to city center14 min
Flights from $1,013
Flights from Dayton (DAY) to Porto (OPO)
Origin airport
James M. Cox Dayton Intl.
Destination airport
Dr. Francisco de Sa Carneiro
Airlines serving
British Airways, Brussels Airlines, Iberia, Lufthansa
Roundtrip price
$493
Distance
3832 mi

Dayton to Porto Flights

The cheapest times to fly from Dayton to Porto

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Dayton to Porto are during the month of January. You can find some of the cheapest flights from Dayton to Porto with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Dayton to Porto

Sunday is one of the best days to book for cheap flights from Dayton to Porto: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Dayton to Porto

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Dayton to Porto in 2026. You can also book with separate airlines for your outbound and return journeys, from $407 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Dayton to Porto flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Dayton to Porto airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from James M. Cox Dayton Intl. Airport (DAY) to Dr. Francisco de Sa Carneiro Airport (OPO) cost?
Snag a cheap one-way flight from $407 or cheap return flight from $493 from James M. Cox Dayton Intl. Airport (DAY) to Dr. Francisco de Sa Carneiro Airport (OPO) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from James M. Cox Dayton Intl. Airport (DAY) to Dr. Francisco de Sa Carneiro Airport (OPO)?
January is the most affordable month to fly from DAY to OPO. Traveling outside of peak seasons is often the key to finding a great deal.
What is the cheapest airline that flies from James M. Cox Dayton Intl. Airport (DAY) to Dr. Francisco de Sa Carneiro Airport (OPO)?
Expedia's filter tool lets you easily compare different airlines, flight durations and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest DAY to OPO flight.
How many flights per day from James M. Cox Dayton Intl. Airport (DAY) to Dr. Francisco de Sa Carneiro Airport (OPO)?
There aren't any daily direct flights from James M. Cox Dayton Intl. Airport (DAY) to Dr. Francisco de Sa Carneiro Airport (OPO). But you can book flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be soaring above the clouds in no time at all.
What day of the week has the most flights from DAY to OPO?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can change based on various factors, including the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from James M. Cox Dayton Intl. Airport (DAY) to Dr. Francisco de Sa Carneiro Airport (OPO)?
Opt for a flight from James M. Cox Dayton Intl. Airport (DAY) to Dr. Francisco de Sa Carneiro Airport (OPO) that leaves before 3 PM to reduce the likelihood of delays. Departures later than this have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from James M. Cox Dayton Intl. Airport (DAY) to Dr. Francisco de Sa Carneiro Airport (OPO) last-minute?
Last-minute fares from DAY to OPO are usually more expensive. To lock in the best prices, start searching for flights well ahead of time. That being said, if you can play around with your travel dates, it's possible to score a cheap ticket right before your journey.
Is it cheaper to book a DAY to OPO flight and hotel package?
Compared with arranging flights and hotels separately, booking a DAY to OPO flight and hotel package with Expedia could result in significant savings. Better still, having everything in one place takes the hassle out of planning your trip. Just secure your flights and select from our wide range of stays, then customize your trip with extras like car rentals and activities.
Can I cancel or change the date of my flight from James M. Cox Dayton Intl. Airport (DAY) to Dr. Francisco de Sa Carneiro Airport (OPO)?
Typically, it's possible to reschedule or cancel your DAY to OPO flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more information on our Customer Service portal.

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*Available to One Key members.