HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Porto

$375+ 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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — OPO
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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.

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 June 12, 2025.

Round-trip from

$721
(Booking.com)

One-way from

$375
(Mytrip)

Popular in

June

Cheapest in

January

Average price

$1,490
From Denver Intl to Porto
Search Deals
One-way flight from Denver Intl to Porto
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($292 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($47 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 12, 2025.

This FlightHub deal was found by Cheapflights users on 6/10. 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.
Mon 12/15:50 pmDEN - OPO
1 stop21h 35mLufthansa
Wed 12/176:00 amOPO - DEN
1 stop17h 00mLufthansa
Deal found 6/10$598
This Booking.com deal was found by Cheapflights users on 6/10. 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.
Mon 12/111:15 amDEN - OPO
2 stops17h 25mMultiple Airlines
Wed 12/176:00 amOPO - DEN
1 stop17h 00mMultiple Airlines
Deal found 6/10$600
This United Airlines deal was found by Cheapflights users on 6/10. 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 12/111:25 amDEN - OPO
2 stops20h 30mUnited Airlines
Wed 12/176:00 amOPO - DEN
2 stops18h 53mUnited Airlines
Deal found 6/10$616
This Delta deal was found by Cheapflights users on 6/10. 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 12/17:10 amDEN - OPO
2 stops20h 40mDelta
Wed 12/175:00 amOPO - DEN
2 stops17h 30mDelta
Deal found 6/10$639
This Air Canada deal was found by Cheapflights users on 6/11. 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.
Mon 10/1311:35 amDEN - OPO
2 stops21h 10mAir Canada
Tue 10/216:00 amOPO - DEN
2 stops33h 42mAir Canada
Deal found 6/11$680
This KAYAK deal was found by Cheapflights users on 6/11. 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.
Thu 8/2112:10 pmDEN - OPO
2 stops21h 55mScandinavian Airlines
Wed 10/111:50 amOPO - DEN
2 stops42h 08mScandinavian Airlines
Deal found 6/11$794
This FlightHub deal was found by Cheapflights users on 6/12. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/67:50 pmDEN - OPO
1 stop37h 00mTurkish Airlines
Wed 9/1710:50 amOPO - DEN
1 stop38h 05mTurkish Airlines
Deal found 6/12$807
This KAYAK deal was found by Cheapflights users on 6/10. 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.
Sat 11/225:30 pmDEN - OPO
1 stop18h 45mBritish Airways
Sat 11/298:40 pmOPO - DEN
2 stops25h 45mBritish Airways
Deal found 6/10$895
This SWISS deal was found by Cheapflights users on 6/9. 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.
Mon 6/305:50 pmDEN - OPO
1 stop31h 05mSWISS
Wed 7/98:40 amOPO - DEN
1 stop14h 40mSWISS
Deal found 6/9$951
This Iberia deal was found by Cheapflights users on 6/12. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/77:16 amDEN - OPO
2 stops25h 39mIberia
Tue 9/168:15 amOPO - DEN
2 stops21h 14mIberia
Deal found 6/12$957

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 June 12, 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

Mon 12/1

5:50 pm-10:25 pm

1 stop21h 35m

Porto

Wed 12/17

6:00 am-4:00 pm

1 stop17h 00m

$598

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 12/1

11:15 am-11:40 am

2 stops17h 25m

Porto

Wed 12/17

6:00 am-4:00 pm

1 stop17h 00m

$600

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 12/1

11:25 am-2:55 pm

2 stops20h 30m

Porto

Wed 12/17

6:00 am-5:53 pm

2 stops18h 53m

$616

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 12/1

7:10 am-10:50 am

2 stops20h 40m

Porto

Wed 12/17

5:00 am-3:30 pm

2 stops17h 30m

$639

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 10/13

11:35 am-3:45 pm

2 stops21h 10m

Porto

Tue 10/21

6:00 am-8:42 am

2 stops33h 42m

$680

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 8/21

12:10 pm-5:05 pm

2 stops21h 55m

Porto

Wed 10/1

11:50 am-10:58 pm

2 stops42h 08m

$794

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sat 9/6

7:50 pm-3:50 pm

1 stop37h 00m

Porto

Wed 9/17

10:50 am-5:55 pm

1 stop38h 05m

$807

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sat 11/22

5:30 pm-7:15 pm

1 stop18h 45m

Porto

Sat 11/29

8:40 pm-3:25 pm

2 stops25h 45m

$895

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 6/30

5:50 pm-7:55 am

1 stop31h 05m

Porto

Wed 7/9

8:40 am-4:20 pm

1 stop14h 40m

$951

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sun 9/7

7:16 am-3:55 pm

2 stops25h 39m

Porto

Tue 9/16

8:15 am-10:29 pm

2 stops21h 14m

$957

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 15 results
1
2

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 June 9, 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 $1,047). 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 June 12, 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 June 12, 2025.
See what other customers who have flown with Delta, SWISS and United Airlines from Denver to Porto have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,946 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,946 reviews
Delta
8.0
Very good
7,946 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,623 reviews
Delta
8.0
Very good
7,946 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,790 reviews
Delta
8.0
Very good
7,946 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Turkish Airlines
7.3
Good
3,848 reviews
Delta
8.0
Very good
7,946 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Scandinavian Airlines
7.3
Good
1,387 reviews
Delta
8.0
Very good
7,946 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 $794, Scandinavian Airlines will fly you from Denver to Porto and back. In addition to Scandinavian 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 $826 and $830, respectively. Scandinavian Airlines is currently priced 18% 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 Air Canada ($535), United Airlines ($578), and Delta ($657).

  • 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 $1,047). 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

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.

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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$516Average$854FlexibilityNo cancel feeOn-time75%
Turkish AirlinesCheapest$574Average$679FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$662Average$913FlexibilityNo cancel feeOn-time76%
DeltaCheapest$692Average$1,190FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$750Average$1,102FlexibilityNo cancel feeOn-time69%

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.