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$333+ 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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — OPO
Jun 9 — Jun 161
Tue 6/9
Tue 6/16
1 adult, Economy
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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 May 10, 2026.

This United Airlines deal was found by Cheapflights users on 5/8. 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.
Tue 12/17:45 am
DEN
-
OPO
1 stop18h 45m
United Airlines
Fri 12/46:00 am
OPO
-
DEN
1 stop17h 00m
United Airlines
Deal found 5/8$708
This Delta deal was found by Cheapflights users on 5/6. 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.
Sun 12/277:00 am
DEN
-
OPO
1 stop19h 05m
Delta
Thu 1/711:15 am
OPO
-
DEN
2 stops38h 03m
Delta
Deal found 5/6$719
This Delta deal was found by Cheapflights users on 5/6. 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.
Tue 12/2911:59 pm
DEN
-
OPO
1 stop26h 06m
Delta
Thu 1/711:15 am
OPO
-
DEN
2 stops38h 03m
Delta
Deal found 5/6$725
This KAYAK deal was found by Cheapflights users on 5/6. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/275:45 pm
DEN
-
OPO
1 stop21h 40m
Lufthansa
Thu 1/71:40 pm
OPO
-
DEN
1 stop31h 55m
Lufthansa
Deal found 5/6$736
This United Airlines deal was found by Cheapflights users on 5/5. 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.
Sat 12/55:39 pm
DEN
-
OPO
2 stops38h 36m
United Airlines
Wed 12/96:00 am
OPO
-
DEN
1 stop17h 00m
United Airlines
Deal found 5/5$739
This KAYAK deal was found by Cheapflights users on 5/6. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/285:42 pm
DEN
-
OPO
2 stops21h 43m
Lufthansa
Thu 1/71:40 pm
OPO
-
DEN
1 stop31h 55m
Lufthansa
Deal found 5/6$740
This United Airlines deal was found by Cheapflights users on 5/5. 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.
Fri 10/304:00 pm
DEN
-
OPO
1 stop11h 30m
United Airlines
Thu 11/56:00 am
OPO
-
DEN
1 stop17h 00m
United Airlines
Deal found 5/5$758

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 May 10, 2026.

Most accurate provider

Ovago
3 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$758
(United Airlines)

One-way from

$368
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$1,168
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. 17% potential increase in price ($211 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($29 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 10, 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

Cheapest round-trip

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Wed 9/30

9:40 am-7:00 am

1 stop14h 20m

Porto

Tue 10/13

12:15 pm-12:21 pm

2 stops31h 06m

$818

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 8/18

6:40 am-10:30 am

1 stop20h 50m

Porto

Mon 8/31

5:00 am-3:31 pm

2 stops17h 31m

$891

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Fri 10/9

6:10 am-10:30 am

2 stops21h 20m

Porto

Fri 10/16

5:55 am-10:33 pm

2 stops23h 38m

$903

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Fri 9/18

5:50 pm-6:55 am

1 stop30h 05m

Porto

Sat 10/3

12:20 pm-10:31 am

1 stop29h 11m

$942

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Fri 9/18

11:59 pm-10:20 am

1 stop27h 21m

Porto

Sat 10/3

5:55 am-3:40 pm

1 stop16h 45m

$965

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 9/22

6:05 am-10:30 am

2 stops21h 25m

Porto

Sun 9/27

11:35 am-11:45 pm

2 stops19h 10m

$969

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sat 7/4

6:30 am-10:20 am

1 stop20h 50m

Porto

Fri 7/17

12:45 pm-10:45 pm

1 stop17h 00m

$987

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 7/28

10:52 am-10:30 am

2 stops16h 38m

Porto

Mon 8/10

6:30 am-3:40 pm

1 stop16h 10m

$995
Quickest round-trip

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Wed 7/29

11:25 am-7:00 am

1 stop12h 35m

Porto

Sun 8/9

12:15 pm-7:00 pm

1 stop13h 45m

$997
Cheapest one-way

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 10/20

10:45 am-10:30 am

2 stops16h 45m

$334

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/9

Showing 1-10 of 16 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 May.
ProviderPrice AccuracyTrust Score*
OvagoPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 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 Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Denver-Porto flight deals on Cheapflights vs. Ovago >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 Ovago the most. Ovago 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?

The best time to book flights from Denver to Porto is 60 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, February is the cheapest month in which you can book a flight from Denver to Porto (average of $723). Flying from Denver to Porto in June is currently the most expensive (average of $1,370). 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.

How much does it cost to fly round-trip from Denver to Porto?

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 May 10, 2026.
Get a feel of what it's like to fly with Turkish Airlines,United Airlines, andLufthansa 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.
Turkish Airlines
7.4
Good
4,357 reviews

Entertainment

7.5

Food

7.5

Boarding

7.3

Crew

7.8

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,May 2026

DEN - IST

The seat assignments that were booked well in advance and paid extra for were all changed and incorrect. This includes the bassinet we requested at time of booking being unavailable and the row we selected not being in the bassinet aisle.
Turkish Airlines
7.4
Good
4,357 reviews
Turkish Airlines
7.4
Good
4,357 reviews

Entertainment

7.5

Food

7.5

Boarding

7.3

Crew

7.8

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,May 2026

DEN - IST

The seat assignments that were booked well in advance and paid extra for were all changed and incorrect. This includes the bassinet we requested at time of booking being unavailable and the row we selected not being in the bassinet aisle.
United Airlines
7.4
Good
9,696 reviews
Turkish Airlines
7.4
Good
4,357 reviews

Entertainment

7.5

Food

7.5

Boarding

7.3

Crew

7.8

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,May 2026

DEN - IST

The seat assignments that were booked well in advance and paid extra for were all changed and incorrect. This includes the bassinet we requested at time of booking being unavailable and the row we selected not being in the bassinet aisle.
Lufthansa
6.8
Okay
7,985 reviews
Turkish Airlines
7.4
Good
4,357 reviews

Entertainment

7.5

Food

7.5

Boarding

7.3

Crew

7.8

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,May 2026

DEN - IST

The seat assignments that were booked well in advance and paid extra for were all changed and incorrect. This includes the bassinet we requested at time of booking being unavailable and the row we selected not being in the bassinet aisle.

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 14h 20m. 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 $592, United Airlines will fly you from Denver to Porto and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Lufthansa and Turkish Airlines - these airlines can fly you to your destination from $663 and $701, respectively. United Airlines is currently priced 38% 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), Delta ($434), and United Airlines ($445).

  • 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, February is the cheapest month in which you can book a flight from Denver to Porto (average of $723). Flying from Denver to Porto in June is currently the most expensive (average of $1,370). 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

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Alternative routes for Denver to Porto

See prices for flight routes from nearby airports that may be better suited for you.
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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 May 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$592Average$966FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$663Average$972FlexibilityNo cancel feeOn-time76%
Turkish AirlinesCheapest$701Average$736FlexibilityNo cancel feeOn-time77%

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