$468 Cheap Flights from Denver (DEN) to Porto (OPO)

View $468 flight on Mon, Mar 23, 2026Opens in a new window

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

  • notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
  • deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Denver to Porto (DEN-OPO)

Prices were available within the past 7 days and start at $468 for one-way flights and $573 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Mar 3 - Tue, Mar 10
DEN
Denver
OPO
Porto
$573 Roundtrip, found 5 days ago
$573
Roundtrip
found 5 days ago
Select United flight, departing Tue, Mar 3 from Denver to Porto, returning Tue, Mar 10, priced at $573 found 5 days ago
United
Tue, Mar 10 - Tue, Mar 31
DEN
Denver
OPO
Porto
$574 Roundtrip, found 5 hours ago
$574
Roundtrip
found 5 hours ago
Select United flight, departing Tue, Mar 10 from Denver to Porto, returning Tue, Mar 31, priced at $574 found 5 hours ago
Air Canada
Sun, Jan 18 - Tue, Jan 27
DEN
Denver
OPO
Porto
$576 Roundtrip, found 4 days ago
$576
Roundtrip
found 4 days ago
Select Air Canada flight, departing Sun, Jan 18 from Denver to Porto, returning Tue, Jan 27, priced at $576 found 4 days ago
Lufthansa
Wed, Jan 21 - Tue, Feb 3
DEN
Denver
OPO
Porto
$576 Roundtrip, found 4 hours ago
$576
Roundtrip
found 4 hours ago
Select Lufthansa flight, departing Wed, Jan 21 from Denver to Porto, returning Tue, Feb 3, priced at $576 found 4 hours ago
Air Canada
Wed, Jan 21 - Tue, Feb 3
DEN
Denver
OPO
Porto
$576 Roundtrip, found 4 hours ago
$576
Roundtrip
found 4 hours ago
Select Air Canada flight, departing Wed, Jan 21 from Denver to Porto, returning Tue, Feb 3, priced at $576 found 4 hours ago
United
Tue, Mar 10 - Thu, Apr 2
DEN
Denver
OPO
Porto
$576 Roundtrip, found 5 hours ago
$576
Roundtrip
found 5 hours ago
Select United flight, departing Tue, Mar 10 from Denver to Porto, returning Thu, Apr 2, priced at $576 found 5 hours ago
Air Canada
Sun, Jan 18 - Tue, Jan 27
DEN
Denver
OPO
Porto
$577 Roundtrip, found 4 days ago
$577
Roundtrip
found 4 days ago
Select Air Canada flight, departing Sun, Jan 18 from Denver to Porto, returning Tue, Jan 27, priced at $577 found 4 days ago
Delta
Mon, Jan 12 - Tue, Jan 20
DEN
Denver
OPO
Porto
$591 Roundtrip, found 4 days ago
$591
Roundtrip
found 4 days ago
Select Delta flight, departing Mon, Jan 12 from Denver to Porto, returning Tue, Jan 20, priced at $591 found 4 days ago
British Airways
Sun, Jan 18 - Tue, Jan 27
DEN
Denver
OPO
Porto
$595 Roundtrip, found 4 days ago
$595
Roundtrip
found 4 days ago
Select British Airways flight, departing Sun, Jan 18 from Denver to Porto, returning Tue, Jan 27, priced at $595 found 4 days ago
Swiss International Air Lines
Wed, Jan 21 - Tue, Feb 3
DEN
Denver
OPO
Porto
$595 Roundtrip, found 4 hours ago
$595
Roundtrip
found 4 hours ago
Select Swiss International Air Lines flight, departing Wed, Jan 21 from Denver to Porto, returning Tue, Feb 3, priced at $595 found 4 hours ago

Black Friday Sale

Limited-time deals: Save up to 50% on select hotels.
Book now

Find the cheapest month to fly from Denver (DEN) to Porto (OPO)

November is typically the cheapest month to fly

From $556 - $1,585 per traveler.

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 $1,435
OPO
Dr. Francisco de Sa Carneiro
CheapestClosest
Average driving time to city center14 min
Flights from $1,435
Flights from Denver (DEN) to Porto (OPO)
Origin airport
Denver Intl.
Destination airport
Dr. Francisco de Sa Carneiro
Airlines serving
Air Canada, Air Europa, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Iberia, JetBlue Airways, KLM, Lufthansa, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United
Roundtrip price
$572
Distance
4751 mi

Denver to Porto Flights

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

 

The best time to book a flight from Denver to Porto

Sunday is one of the best days to book for cheap flights from Denver 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 Denver 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 Denver to Porto in 2026. You can also book with separate airlines for your outbound and return journeys, from $468 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 Denver 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 Denver 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 Denver Intl. Airport (DEN) to Dr. Francisco de Sa Carneiro Airport (OPO) cost?
Snag a cheap one-way flight from $468 or cheap return flight from $573 from Denver Intl. Airport (DEN) to Dr. Francisco de Sa Carneiro Airport (OPO) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Denver Intl. Airport (DEN) to Dr. Francisco de Sa Carneiro Airport (OPO)?
The cheapest month to fly from DEN to OPO is March, when there's less demand. Off-peak season is generally when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Denver Intl. Airport (DEN) to Dr. Francisco de Sa Carneiro Airport (OPO)?
To find the cheapest airline flying from DEN to OPO, use Expedia's filter tool. Tailor your search based on what's important to you, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
How many flights per day from Denver Intl. Airport (DEN) to Dr. Francisco de Sa Carneiro Airport (OPO)?
You'll need to book a flight with a layover if you're traveling from Denver Intl. Airport (DEN) to Dr. Francisco de Sa Carneiro Airport (OPO). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from DEN 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 a number of factors, such as 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 Denver Intl. Airport (DEN) to Dr. Francisco de Sa Carneiro Airport (OPO)?
Book a flight from Denver Intl. Airport (DEN) to Dr. Francisco de Sa Carneiro Airport (OPO) that leaves before 3 PM to reduce the risk of 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 Denver Intl. Airport (DEN) to Dr. Francisco de Sa Carneiro Airport (OPO) last-minute?
Last-minute fares from DEN to OPO are typically more expensive. For the lowest rates, start looking for flights early. That being said, if you can play around with your travel dates, it's possible to find a cheap fare just before your departure.
Is it cheaper to book a DEN to OPO flight and hotel package?
You can save money by securing a DEN to OPO flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one place. Once you've selected your ideal accommodations and flights, you can add extras such as activities, tours and car rentals.
Can I cancel or change the date of my flight from Denver Intl. Airport (DEN) to Dr. Francisco de Sa Carneiro Airport (OPO)?
If you booked your DEN to OPO flight in the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal if you'd like more information.

Explore a world of travel with Expedia

*Available to One Key members.