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$520+ Cheap flights from Denver (DEN) to Porto (OPO)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/21. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — OPO
Jan 27 — Feb 31
Tue 1/27
Tue 2/3
1 adult, Economy
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Find cheap flights from Denver to Porto with Cheapflights

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Cheapflights Tip: The best prices from Denver Intl to Porto are usually found in February or March, booked 84 days in advance, depart on a Monday or Thursday and return on a Wednesday

Cheap flight deals from Denver to Porto

Cheapest flights from Denver to Porto
Explore the most affordable flight options available from Denver to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 28, 2025.

This Air France deal was found by Cheapflights users on 12/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:35 amDEN - OPO
2 stops16h 55mMultiple Airlines
Mon 1/124:10 pmOPO - DEN
2 stops30h 05mMultiple Airlines
Deal found 12/26$654
This Ovago deal was found by Cheapflights users on 12/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:25 pmDEN - OPO
1 stop16h 20mBritish Airways
Mon 1/128:40 pmOPO - DEN
2 stops32h 44mBritish Airways
Deal found 12/26$852
This Lufthansa deal was found by Cheapflights users on 12/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/314:20 pmDEN - OPO
1 stop24h 20mLufthansa
Mon 1/121:45 pmOPO - DEN
1 stop31h 50mLufthansa
Deal found 12/26$924

Find flight deals from Denver to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to Porto (OPO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$509
(Iberia)

Popular in

June

Cheapest in

February

Average price

$1,095
Provider with most accurate pricing for Denver Intl-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Porto flights.
Search Deals
From Denver Intl to Porto
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($278 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($46 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Denver to Porto that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 28, 2025.
Use the filters below to find and compare flights from Denver to Porto that are best for you.

Fly from

Denver

Fly to

Porto

Route

Depart

Return

Price

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 1/22

3:55 pm-2:45 pm

1 stop15h 50m

Porto

Mon 1/26

12:30 pm-1:40 pm

1 stop32h 10m

$634

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Wed 12/31

10:35 am-10:30 am

2 stops16h 55m

Porto

Mon 1/12

4:10 pm-3:15 pm

2 stops30h 05m

$654

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 3/24

11:15 am-12:05 pm

2 stops18h 50m

Porto

Sun 4/12

4:35 pm-7:24 pm

2 stops33h 49m

$685

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sat 3/14

5:54 pm-12:50 pm

2 stops36h 56m

Porto

Sun 3/22

7:25 pm-11:30 pm

2 stops34h 05m

$782

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 3/12

6:25 pm-5:15 pm

1 stop16h 50m

Porto

Sun 3/22

8:05 pm-4:30 pm

1 stop26h 25m

$819

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 3/12

11:15 am-12:05 pm

2 stops18h 50m

Porto

Sun 3/22

7:25 pm-11:30 pm

2 stops34h 05m

$845

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Wed 12/31

5:25 pm-4:45 pm

1 stop16h 20m

Porto

Mon 1/12

8:40 pm-10:24 pm

2 stops32h 44m

$852

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Wed 2/11

9:45 am-5:30 pm

2 stops24h 45m

Porto

Sun 2/15

6:00 am-4:40 pm

2 stops41h 40m

$860

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Wed 12/31

4:20 pm-11:40 pm

1 stop24h 20m

Porto

Mon 1/12

1:45 pm-2:35 pm

1 stop31h 50m

$924

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sat 3/21

8:20 pm-9:55 am

1 stop31h 35m

$520

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/26

Showing 1-10 of 11 results
1
2

Compare providers for flights from Denver to Porto

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Denver to Porto in December.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy2 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Denver-Porto flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Denver-Porto flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Denver-Porto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Denver-Porto flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Denver-Porto flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Denver to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Denver with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Denver to Porto

How far ahead should I book a flight from Denver to Porto?

Use this chart to determine the optimal time to book a round-trip flight from Denver to Porto. Price data was last updated on December 26, 2025.

The best time to book flights from Denver to Porto is 84 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Denver to Porto?

Currently, March is the cheapest month in which you can book a flight from Denver to Porto (average of $574). Flying from Denver to Porto in June is currently the most expensive (average of $1,116). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from DEN to OPO?

Find hourly flight availability from Denver to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 28, 2025.

It’s optimal to fly from Denver to Porto in the evening. By choosing this option you can save up to 32% on the cost of your flight, compared to a flight at noon.

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Porto. Reviews last updated December 28, 2025.
Get a feel of what it's like to fly with United Airlines, Turkish Airlines, and Lufthansa from Denver to Porto by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,113 reviews

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Boarding

7.7

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
United Airlines
7.4
Good
9,113 reviews
United Airlines
7.4
Good
9,113 reviews

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Boarding

7.7

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
Turkish Airlines
7.3
Good
4,126 reviews
United Airlines
7.4
Good
9,113 reviews

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Boarding

7.7

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
Lufthansa
6.8
Okay
7,658 reviews
United Airlines
7.4
Good
9,113 reviews

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Boarding

7.7

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

Related info for your journey

Find useful and relevant information for your journey from Denver to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Denver to Porto?

    Departing from Denver to Porto will take you 15h 50m. There are 4747 mi between Denver and Porto.

  • What are the cheapest airlines flying from Denver to Porto round-trip?

    Currently priced at $574, Turkish Airlines will fly you from Denver to Porto and back. In addition to Turkish Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Lufthansa and United Airlines - these airlines can fly you to your destination from $641 and $702, respectively. Turkish Airlines is currently priced 41% below the average price you’ll pay for this route.

  • Can I find deals for flights from Denver to Porto that include hotel bookings?

    Yes. In addition to deals on Denver to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Denver to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Denver to Porto.

  • Can I find deals for business class flights from Denver to Porto?

    Yes. Cheapflights offers flight deals from Denver to Porto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Denver to Porto?

    Currently, March is the cheapest month in which you can book a flight from Denver to Porto (average of $574). Flying from Denver to Porto in June is currently the most expensive (average of $1,116). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Aveiro
Arcos de Valdevez
Coimbra
Vila Nova de Gaia

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Top 3 airlines flying from Denver to Porto

Discover the top 3 airlines that operate flights from Denver to Porto. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$574Average$684FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$641Average$870FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$702Average$1,014FlexibilityNo cancel feeOn-time69%

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