HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Porto

$271+ 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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — OPO
Mar 31 — Apr 71
Tue 3/31
Tue 4/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Denver to Porto with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 March 1, 2026.

This Delta deal was found by Cheapflights users on 2/25. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/134:30 pm
DEN
-
OPO
2 stops18h 25m
Delta
Tue 4/285:00 am
OPO
-
DEN
2 stops17h 36m
Delta
Deal found 2/25$569
This United Airlines deal was found by Cheapflights users on 2/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/43:45 pm
DEN
-
OPO
1 stop16h 55m
United Airlines
Mon 11/1612:30 pm
OPO
-
DEN
1 stop34h 30m
United Airlines
Deal found 2/25$585
This Iberia deal was found by Cheapflights users on 2/26. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/196:40 pm
DEN
-
OPO
1 stop18h 55m
Multiple Airlines
Tue 4/288:40 pm
OPO
-
DEN
2 stops33h 05m
Multiple Airlines
Deal found 2/26$588
This Delta deal was found by Cheapflights users on 2/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/133:30 pm
DEN
-
OPO
2 stops23h 30m
Delta
Mon 4/274:20 pm
OPO
-
DEN
2 stops34h 22m
Delta
Deal found 2/27$595
This British Airways deal was found by Cheapflights users on 2/25. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:40 pm
DEN
-
OPO
1 stop18h 10m
British Airways
Tue 4/288:40 pm
OPO
-
DEN
1 stop26h 50m
British Airways
Deal found 2/25$597
This Expedia deal was found by Cheapflights users on 2/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/196:40 pm
DEN
-
OPO
1 stop18h 55m
British Airways
Tue 4/288:55 pm
OPO
-
DEN
1 stop26h 35m
British Airways
Deal found 2/26$607
This United Airlines deal was found by Cheapflights users on 2/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/309:40 am
DEN
-
OPO
1 stop14h 20m
United Airlines
Tue 10/1312:15 pm
OPO
-
DEN
2 stops33h 33m
United Airlines
Deal found 2/25$608
This Justfly.com deal was found by Cheapflights users on 2/25. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/45:40 pm
DEN
-
OPO
1 stop22h 10m
Multiple Airlines
Mon 11/167:20 pm
OPO
-
DEN
2 stops31h 34m
Multiple Airlines
Deal found 2/25$614
This American Airlines deal was found by Cheapflights users on 2/25. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/42:41 pm
DEN
-
OPO
2 stops18h 19m
American Airlines
Mon 11/168:40 pm
OPO
-
DEN
2 stops21h 51m
American Airlines
Deal found 2/25$616

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 March 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$569
(Delta)

One-way from

$271
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$784
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
One-way flight from Denver Intl to Porto
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($258 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($45 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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 March 1, 2026.
Use the filters below to find and compare flights from Denver to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 4/13

3:30 pm-10:00 pm

2 stops23h 30m

Porto

Mon 4/27

4:20 pm-7:42 pm

2 stops34h 22m

$595

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 4/13

6:40 pm-8:05 pm

1 stop18h 25m

Porto

Mon 4/27

9:25 pm-4:30 pm

1 stop26h 05m

$628

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 5/7

6:40 pm-8:20 pm

1 stop18h 40m

Porto

Sun 5/17

9:25 pm-5:02 pm

2 stops26h 37m

$766

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 5/7

4:10 pm-7:15 pm

2 stops20h 05m

Porto

Sun 5/17

5:00 am-5:35 pm

2 stops19h 35m

$793

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 3/5

7:20 pm-3:10 pm

1 stop36h 50m

Porto

Mon 3/9

4:10 pm-6:35 pm

1 stop32h 25m

$806

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 5/12

12:35 pm-3:30 pm

2 stops19h 55m

Porto

Sun 5/24

5:00 am-5:14 pm

2 stops19h 14m

$822

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Fri 5/15

5:40 pm-10:00 pm

1 stop21h 20m

Porto

Wed 5/20

5:00 am-8:15 pm

2 stops22h 15m

$833

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 5/25

6:21 pm-6:10 pm

2 stops16h 49m

Porto

Fri 6/5

5:55 am-3:40 pm

1 stop16h 45m

$942

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sat 5/2

8:25 pm-3:50 pm

1 stop36h 25m

Porto

Tue 5/5

4:50 pm-10:19 pm

2 stops36h 29m

$945

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sun 5/17

7:15 am-9:40 am

3 stops43h 25m

$361

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/28

Showing 1-10 of 17 resultsSorted by cheapest first
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 March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Denver-Porto flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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 February 27, 2026.

The best time to book flights from Denver to Porto is 35 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, November is the cheapest month in which you can book a flight from Denver to Porto (average of $560). Flying from Denver to Porto in June is currently the most expensive (average of $1,044). 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.

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 March 1, 2026.
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
9,371 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Overall

7.4

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,371 reviews
United Airlines
7.4
Good
9,371 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Overall

7.4

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Turkish Airlines
7.3
Good
4,239 reviews
United Airlines
7.4
Good
9,371 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Overall

7.4

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Lufthansa
6.8
Okay
7,818 reviews
United Airlines
7.4
Good
9,371 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Overall

7.4

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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 18h 25m. There are 4747 mi between Denver and Porto. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Currently priced at $575, 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 United Airlines and Lufthansa - these airlines can fly you to your destination from $593 and $663, respectively. Turkish Airlines is currently priced 39% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Denver to Porto one-way?

    The cheapest airlines for a one-way flight from Denver to Porto are Lufthansa ($418), United Airlines ($492), and KLM ($515).

  • 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, November is the cheapest month in which you can book a flight from Denver to Porto (average of $560). Flying from Denver to Porto in June is currently the most expensive (average of $1,044). 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
Vila Nova de Gaia
Aveiro
Arcos de Valdevez
Coimbra

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Denver to Porto

See prices for flight routes from nearby airports that may be better suited for you.
Denver to Lisbon flights
Colorado Springs to Lisbon flights
Denver to Lajes flights

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 March 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$575Average$728FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$593Average$986FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$663Average$907FlexibilityNo cancel feeOn-time76%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2026 Cheapflights