$551 Cheap Flights from Porto (OPO) to Denver (DEN)

View $551 flight on Wed, Feb 4, 2026Opens in a new window

Popular airlines from Porto Airport (OPO) to Denver Intl. Airport (DEN)

Cheap Flights from Porto to Denver (OPO-DEN)

Prices were available within the past 7 days and start at $551 for one-way flights and $876 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Thu, Dec 4 - Thu, Dec 11
OPO
Porto
DEN
Denver
$876 Roundtrip, found 4 days ago
$876
Roundtrip
found 4 days ago
Select Air Canada flight, departing Thu, Dec 4 from Porto to Denver, returning Thu, Dec 11, priced at $876 found 4 days ago
Lufthansa
Thu, Apr 30 - Mon, May 4
OPO
Porto
DEN
Denver
$880 Roundtrip, found 10 hours ago
$880
Roundtrip
found 10 hours ago
Select Lufthansa flight, departing Thu, Apr 30 from Porto to Denver, returning Mon, May 4, priced at $880 found 10 hours ago
Lufthansa
Thu, Apr 30 - Mon, May 4
OPO
Porto
DEN
Denver
$881 Roundtrip, found 10 hours ago
$881
Roundtrip
found 10 hours ago
Select Lufthansa flight, departing Thu, Apr 30 from Porto to Denver, returning Mon, May 4, priced at $881 found 10 hours ago
Lufthansa
Thu, Apr 30 - Mon, May 4
OPO
Porto
DEN
Denver
$882 Roundtrip, found 10 hours ago
$882
Roundtrip
found 10 hours ago
Select Lufthansa flight, departing Thu, Apr 30 from Porto to Denver, returning Mon, May 4, priced at $882 found 10 hours ago
Lufthansa
Thu, Apr 30 - Mon, May 4
OPO
Porto
DEN
Denver
$883 Roundtrip, found 10 hours ago
$883
Roundtrip
found 10 hours ago
Select Lufthansa flight, departing Thu, Apr 30 from Porto to Denver, returning Mon, May 4, priced at $883 found 10 hours ago
Lufthansa
Thu, Apr 30 - Mon, May 4
OPO
Porto
DEN
Denver
$883 Roundtrip, found 10 hours ago
$883
Roundtrip
found 10 hours ago
Select Lufthansa flight, departing Thu, Apr 30 from Porto to Denver, returning Mon, May 4, priced at $883 found 10 hours ago
Lufthansa
Thu, Apr 30 - Mon, May 4
OPO
Porto
DEN
Denver
$884 Roundtrip, found 10 hours ago
$884
Roundtrip
found 10 hours ago
Select Lufthansa flight, departing Thu, Apr 30 from Porto to Denver, returning Mon, May 4, priced at $884 found 10 hours ago
British Airways
Sat, Dec 6 - Sat, Dec 13
OPO
Porto
DEN
Denver
$885 Roundtrip, found 1 day ago
$885
Roundtrip
found 1 day ago
Select British Airways flight, departing Sat, Dec 6 from Porto to Denver, returning Sat, Dec 13, priced at $885 found 1 day ago
Delta
Tue, May 12 - Sun, May 24
OPO
Porto
DEN
Denver
$891 Roundtrip, found 5 days ago
$891
Roundtrip
found 5 days ago
Select Delta flight, departing Tue, May 12 from Porto to Denver, returning Sun, May 24, priced at $891 found 5 days ago
Swiss International Air Lines
Wed, Mar 25 - Tue, Mar 31
OPO
Porto
DEN
Denver
$893 Roundtrip, found 4 days ago
$893
Roundtrip
found 4 days ago
Select Swiss International Air Lines flight, departing Wed, Mar 25 from Porto to Denver, returning Tue, Mar 31, priced at $893 found 4 days ago

Alternative airports near Denver

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

Select flight to Denver Intl. DEN. Cheapest option available. Average driving time to city center is 32 minutes. Flights from $897
DEN
Denver Intl.
Cheapest
Average driving time to city center32 min
Flights from $897

Frequently asked questions

How much does a flight from Dr. Francisco de Sa Carneiro Airport (OPO) to Denver Intl. Airport (DEN) cost?
Secure a cheap one-way flight from $551 or cheap return flight from $876 from Dr. Francisco de Sa Carneiro Airport (OPO) to Denver Intl. Airport (DEN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Dr. Francisco de Sa Carneiro Airport (OPO) to Denver Intl. Airport (DEN)?
December is the most affordable month to fly from OPO to DEN. Traveling outside of peak seasons is often the key to finding better fares.
What is the cheapest airline that flies from Dr. Francisco de Sa Carneiro Airport (OPO) to Denver Intl. Airport (DEN)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest OPO to DEN flight.
How many flights per day from Dr. Francisco de Sa Carneiro Airport (OPO) to Denver Intl. Airport (DEN)?
Nonstop flights from Dr. Francisco de Sa Carneiro Airport (OPO) to Denver Intl. Airport (DEN) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel details and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from OPO to DEN?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can vary depending on various factors, such as the season 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 Dr. Francisco de Sa Carneiro Airport (OPO) to Denver Intl. Airport (DEN)?
Opt for a flight from Dr. Francisco de Sa Carneiro Airport (OPO) to Denver Intl. Airport (DEN) that leaves before 3 PM to reduce the likelihood of delays and cancellations. Later departures 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 Dr. Francisco de Sa Carneiro Airport (OPO) to Denver Intl. Airport (DEN) last-minute?
Last-minute fares from OPO to DEN are generally more expensive. To lock in the best prices, start searching for flights well ahead of time. That being said, if you're flexible with your travel dates, you may find a cheap fare right before your journey.
Is it cheaper to book an OPO to DEN flight and hotel package?
Compared with arranging flights and hotels separately, booking an OPO to DEN flight and hotel package with Expedia could result in significant savings. What's more, having everything in one easy place will take the stress out of travel planning. Just secure your flights and select from our wide range of stays, then tailor your trip with extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Dr. Francisco de Sa Carneiro Airport (OPO) to Denver Intl. Airport (DEN)?
If you reserved your OPO to DEN flight within the last 24 hours, you may be able to cancel or modify it without fees. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Dr. Francisco de Sa Carneiro
Destination airport
Denver Intl.
Airlines serving
Air Canada, American Airlines, British Airways, Brussels Airlines, Delta, Iberia, KLM, Lufthansa, Swiss International Air Lines, TAP Portugal, United
Roundtrip price
$876
Distance
4751 mi

Book with confidence

Porto to Denver Flights

The cheapest times to fly from Porto to Denver

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 Porto to Denver are during the month of December. You can find some of the cheapest flights from Porto to Denver with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Porto to Denver

Sunday is one of the best days to book for cheap flights from Porto to Denver: 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 Porto to Denver

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 Porto to Denver in 2025. You can also book with separate airlines for your outbound and return journeys, from $551 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 Porto to Denver 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 Porto to Denver 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.

 

Porto to Denver Flights

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*Available to One Key members.