$448 Cheap Flights from Houston (HOU) to Porto (OPO)

View $448 flight on Sat, Dec 6, 2025Opens in a new window

Popular airlines from Houston William Hobby Airport (HOU) to Porto Airport (OPO)

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Cheap Flights from Houston to Porto (HOU-OPO)

Prices were available within the past 7 days and start at $448 for one-way flights and $546 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Fri, Jan 23 - Mon, Jan 26
HOU
Houston
OPO
Porto
$546 Roundtrip, found 17 hours ago
$546
Roundtrip
found 17 hours ago
Select Delta flight, departing Fri, Jan 23 from Houston to Porto, returning Mon, Jan 26, priced at $546 found 17 hours 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 $709
OPO
Dr. Francisco de Sa Carneiro
CheapestClosest
Average driving time to city center14 min
Flights from $709

Frequently asked questions

How much does a flight from William P. Hobby Airport (HOU) to Dr. Francisco de Sa Carneiro Airport (OPO) cost?
Snag a cheap one-way flight from $448 or cheap return flight from $546 from William P. Hobby Airport (HOU) 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 deals on this route.
What is the cheapest month to fly from William P. Hobby Airport (HOU) to Dr. Francisco de Sa Carneiro Airport (OPO)?
January is the least expensive month to fly from HOU to OPO. Traveling during quieter months is often the key to finding a great deal.
What is the cheapest airline that flies from William P. Hobby Airport (HOU) to Dr. Francisco de Sa Carneiro Airport (OPO)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll fly you from HOU to OPO. Then, sort your results by "Price (lowest to highest)" to snap up a good deal.
How many flights per day from William P. Hobby Airport (HOU) to Dr. Francisco de Sa Carneiro Airport (OPO)?
Nonstop flights from William P. Hobby Airport (HOU) to Dr. Francisco de Sa Carneiro Airport (OPO) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from HOU to OPO?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can vary based on a range of 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 William P. Hobby Airport (HOU) to Dr. Francisco de Sa Carneiro Airport (OPO)?
To touch down at Dr. Francisco de Sa Carneiro Airport (OPO) without delays, opt for a flight that takes off from William P. Hobby Airport (HOU) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**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 William P. Hobby Airport (HOU) to Dr. Francisco de Sa Carneiro Airport (OPO) last-minute?
Waiting until right before your break to book a ticket from HOU to OPO often results in higher prices. While you might find some last-minute offers, they're not always guaranteed. Keep your travel schedule open for a better chance of snagging a bargain.
Is it cheaper to book a HOU to OPO flight and hotel package?
Opting for a HOU to OPO flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip in one place. Pick from our extensive range of hotels and then add car rentals, flights and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from William P. Hobby Airport (HOU) to Dr. Francisco de Sa Carneiro Airport (OPO)?
You can usually cancel or reschedule your HOU to OPO flight. However, if it's been more than 24 hours since booking, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Origin airport
William P. Hobby
Destination airport
Dr. Francisco de Sa Carneiro
Airlines serving
American Airlines, British Airways, Delta, Iberia, KLM
Roundtrip price
$546
Distance
4739 mi

Book with confidence

Houston to Porto Flights

The cheapest times to fly from Houston 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 Houston to Porto are during the month of January. You can find some of the cheapest flights from Houston to Porto with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Houston to Porto

Sunday is one of the best days to book for cheap flights from Houston 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 Houston 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 Houston to Porto in 2025. You can also book with separate airlines for your outbound and return journeys, from $448 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 Houston 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 Houston 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.

 

Houston to Porto Flights

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*Available to One Key members.