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$284+ 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 9/20. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — OPO
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Denver Intl to Porto are usually found in January or February, booked 85 days in advance, depart on a Monday or Thursday and return on a Wednesday

Cheap 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 August 14, 2025.

Round-trip from

$593
(United Airlines)

One-way from

$284
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$955
From Denver Intl to Porto
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One-way flight from Denver Intl to Porto
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Highest demand for flights based on searches. 22% potential increase in price ($290 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($48 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find 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 August 14, 2025.

This United Airlines deal was found by Cheapflights users on 8/14. 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 10/281:45 pmDEN - OPO
1 stop13h 45mUnited Airlines
Fri 11/712:35 pmOPO - DEN
1 stop15h 48mUnited Airlines
Deal found 8/14$593
This United Airlines deal was found by Cheapflights users on 8/13. 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.
Sun 11/231:45 pmDEN - OPO
1 stop12h 45mUnited Airlines
Mon 12/112:30 pmOPO - DEN
1 stop34h 30mUnited Airlines
Deal found 8/13$599
This United Airlines deal was found by Cheapflights users on 8/12. 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 10/215:59 pmDEN - OPO
1 stop14h 46mUnited Airlines
Tue 11/46:00 amOPO - DEN
1 stop17h 00mUnited Airlines
Deal found 8/12$601
This Mytrip deal was found by Cheapflights users on 8/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/299:40 amDEN - OPO
2 stops22h 25mMultiple Airlines
Wed 10/157:15 amOPO - DEN
2 stops33h 49mMultiple Airlines
Deal found 8/12$609
This Booking.com deal was found by Cheapflights users on 8/12. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/65:30 pmDEN - OPO
2 stops58h 45mMultiple Airlines
Sat 12/1312:40 pmOPO - DEN
1 stop34h 20mMultiple Airlines
Deal found 8/12$671
This Lufthansa deal was found by Cheapflights users on 8/13. 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 10/224:15 pmDEN - OPO
1 stop24h 05mLufthansa
Thu 10/306:00 amOPO - DEN
1 stop17h 00mLufthansa
Deal found 8/13$677

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 August 14, 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

Tue 10/28

1:45 pm-9:30 am

1 stop13h 45m

Porto

Fri 11/7

12:35 pm-9:23 pm

1 stop15h 48m

$593

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 10/21

11:15 am-11:15 am

2 stops17h 00m

Porto

Tue 11/4

6:00 am-8:53 am

2 stops33h 53m

$601

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 10/21

5:59 pm-3:45 pm

1 stop14h 46m

Porto

Tue 11/4

6:00 am-4:00 pm

1 stop17h 00m

$601

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 9/29

9:40 am-3:05 pm

2 stops22h 25m

Porto

Wed 10/15

7:15 am-10:04 am

2 stops33h 49m

$609

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Wed 10/22

4:15 pm-11:20 pm

1 stop24h 05m

Porto

Thu 10/30

6:00 am-5:00 pm

1 stop17h 00m

$677

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sat 9/20

6:55 pm-9:15 am

2 stops55h 20m

$284

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 9/23

10:55 pm-9:50 pm

2 stops39h 55m

$287

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sat 9/13

12:59 am-10:05 pm

3 stops38h 06m

$288

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sun 9/21

6:55 pm-9:00 am

2 stops55h 05m

$307

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sun 9/21

12:59 am-9:00 am

3 stops49h 01m

$309

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 12 results
1
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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 August 8, 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, January is the cheapest month in which you can book a flight from Denver to Porto (average of $523). Flying from Denver to Porto in June is currently the most expensive (average of $1,029). 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 August 14, 2025.

It’s optimal to fly from Denver to Porto in the evening. By choosing this option you can save up to 33% 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 August 14, 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
8,916 reviews

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Overall

7.4

Crew

8.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,916 reviews
United Airlines
7.4
Good
8,916 reviews

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Overall

7.4

Crew

8.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Turkish Airlines
7.3
Good
3,940 reviews
United Airlines
7.4
Good
8,916 reviews

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Overall

7.4

Crew

8.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Lufthansa
6.8
Okay
7,317 reviews
United Airlines
7.4
Good
8,916 reviews

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Overall

7.4

Crew

8.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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.

  • 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 $681 and $750, 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, January is the cheapest month in which you can book a flight from Denver to Porto (average of $523). Flying from Denver to Porto in June is currently the most expensive (average of $1,029). 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

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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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$574Average$679FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$681Average$923FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$750Average$1,050FlexibilityNo cancel feeOn-time69%

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