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$438+ 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 6/1. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — OPO
Mar 30 — Apr 61
Sun 3/30
Sun 4/6
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 January or November, booked 29 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 March 25, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$627
(Justfly.com)

One-way from

$438
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$789
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. 25% potential increase in price ($341 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($40 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
Search Deals

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 March 25, 2025.

This FlightHub deal was found by Cheapflights users on 3/24. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/258:35 pmDEN - OPO
1 stop36h 45mTurkish Airlines
Wed 4/210:50 amOPO - DEN
1 stop38h 05mTurkish Airlines
Deal found 3/24$623
This United Airlines deal was found by Cheapflights users on 3/24. 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 9/176:00 amDEN - OPO
2 stops20h 30mUnited Airlines
Sun 9/2812:15 pmOPO - DEN
2 stops31h 08mUnited Airlines
Deal found 3/24$678
This Lufthansa deal was found by Cheapflights users on 3/24. 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.
Mon 10/134:05 pmDEN - OPO
1 stop24h 15mLufthansa
Tue 10/216:15 amOPO - DEN
1 stop15h 05mLufthansa
Deal found 3/24$679
This Air Canada deal was found by Cheapflights users on 3/24. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/167:15 pmDEN - OPO
2 stops31h 10mAir Canada
Tue 9/3012:50 pmOPO - DEN
2 stops26h 53mAir Canada
Deal found 3/24$686
This United deal was found by Cheapflights users on 3/23. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/95:49 pmDEN - OPO
2 stops32h 56mMultiple Airlines
Fri 5/238:40 amOPO - DEN
1 stop14h 40mMultiple Airlines
Deal found 3/23$693
This American Airlines deal was found by Cheapflights users on 3/24. 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 10/132:50 pmDEN - OPO
2 stops18h 05mAmerican Airlines
Tue 10/2112:20 pmOPO - DEN
2 stops18h 18mAmerican Airlines
Deal found 3/24$705
This KLM deal was found by Cheapflights users on 3/23. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/225:40 pmDEN - OPO
1 stop14h 50mKLM
Tue 4/296:20 amOPO - DEN
2 stops20h 56mKLM
Deal found 3/23$722
This Delta deal was found by Cheapflights users on 3/23. 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.
Fri 5/95:40 pmDEN - OPO
1 stop31h 45mDelta
Fri 5/236:40 amOPO - DEN
2 stops24h 32mDelta
Deal found 3/23$776
This Gurufare deal was found by Cheapflights users on 3/24. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2510:42 amDEN - OPO
2 stops37h 53mBritish Airways
Sat 10/48:15 amOPO - DEN
2 stops18h 45mBritish Airways
Deal found 3/24$905
This Aeromexico deal was found by Cheapflights users on 3/24. 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 Aeromexico is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/412:20 pmDEN - OPO
2 stops20h 10mAir France
Mon 9/224:20 pmOPO - DEN
1 stop30h 10mAir France
Deal found 3/24$941
This Priceline deal was found by Cheapflights users on 3/24. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/412:32 pmDEN - OPO
2 stops20h 28mIberia
Wed 11/58:40 pmOPO - DEN
2 stops25h 45mIberia
Deal found 3/24$1,201
This SWISS deal was found by Cheapflights users on 3/24. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/235:50 pmDEN - OPO
1 stop34h 40mSWISS
Fri 6/138:40 amOPO - DEN
1 stop14h 40mSWISS
Deal found 3/24$1,248

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 25, 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 4/8

7:50 pm-10:05 am

1 stop31h 15m

Porto

Wed 4/16

10:50 am-5:55 pm

1 stop38h 05m

$627

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Wed 9/17

6:00 am-9:30 am

2 stops20h 30m

Porto

Sun 9/28

12:15 pm-12:23 pm

2 stops31h 08m

$678

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 9/16

7:15 pm-9:25 am

2 stops31h 10m

Porto

Tue 9/30

12:50 pm-10:18 am

1 stop28h 28m

$686

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Fri 5/9

5:49 pm-9:45 am

2 stops32h 56m

Porto

Fri 5/23

8:40 am-4:20 pm

1 stop14h 40m

$693

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Fri 5/2

4:15 pm-11:20 pm

1 stop24h 05m

Porto

Thu 5/15

6:15 am-1:45 pm

1 stop14h 30m

$695

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 4/22

5:40 pm-3:30 pm

1 stop14h 50m

Porto

Tue 4/29

6:20 am-8:16 pm

2 stops20h 56m

$722

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Fri 5/9

5:40 pm-8:25 am

1 stop31h 45m

Porto

Fri 5/23

6:40 am-12:12 am

2 stops24h 32m

$776

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 9/1

9:30 am-11:40 am

2 stops19h 10m

Porto

Thu 9/11

12:20 pm-11:35 pm

2 stops18h 15m

$800

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 9/4

12:20 pm-3:30 pm

2 stops20h 10m

Porto

Mon 9/22

4:20 pm-3:30 pm

1 stop30h 10m

$941

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Fri 5/23

5:50 pm-11:30 am

1 stop34h 40m

Porto

Fri 6/13

8:40 am-4:20 pm

1 stop14h 40m

$1,248

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 22 results
1
2
3

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
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star

*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 March 21, 2025.

The best time to book flights from Denver to Porto is 29 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 $1,082). 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 March 25, 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.

What is the cheapest day to fly from Denver to Porto?

Use this chart to determine the cheapest time to fly round-trip from Denver to Porto. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Denver to Porto flight should consider departing on Sunday evenings when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Porto by month

Plan your trip to Porto by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Porto ranges from 0.7 - 7.7 inches per month. December is typically the wettest month, when rainfall can reach 7.7 in. July is typically the driest time to visit Porto when rainfall is around 0.7 in.

Temperature in Porto by month

Plan your trip to Porto by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Porto, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

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 25, 2025.
Delta
8.0
Very good
7,890 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,890 reviews
Delta
8.0
Very good
7,890 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,318 reviews
Delta
8.0
Very good
7,890 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
SWISS
7.5
Good
1,569 reviews
Delta
8.0
Very good
7,890 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,605 reviews
Delta
8.0
Very good
7,890 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Turkish Airlines
7.3
Good
3,745 reviews
Delta
8.0
Very good
7,890 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 $627, 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 $689 and $692, respectively. Turkish Airlines is currently priced 37% 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 ($485), SWISS ($486), and Air Canada ($488).

  • 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 $1,082). 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 Denver?

Book flights to Denver if you plan to visit one of these locations
Aveiro
Coimbra
Matosinhos
Arcos de Valdevez

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Top 5 airlines flying from Denver to Porto

Discover the top 5 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 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$516Average$977FlexibilityNo cancel feeOn-time75%
Turkish AirlinesCheapest$574Average$658FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$662Average$967FlexibilityNo cancel feeOn-time76%
DeltaCheapest$692Average$1,163FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$753Average$1,276FlexibilityNo cancel feeOn-time69%
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