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$280+ Cheap flights from Colorado 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 10/6. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — OPO
Aug 6 — Aug 131
Wed 8/6
Wed 8/13
1 adult, Economy
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Cheap flight deals from Colorado to Porto

Keep the following information in mind while searching for Colorado to Porto flight deals. Data was last updated August 1, 2025.

Round-trip from

$593
(United Airlines)

One-way from

$280
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$973
From Colorado to Porto
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One-way flight from Colorado to Porto
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Highest demand for flights based on searches. 24% potential increase in price ($304 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 Colorado to Porto

Cheapest flights from Colorado to Porto
Explore the most affordable flight options available from Colorado to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 1, 2025.

This United Airlines deal was found by Cheapflights users on 7/30. 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 7/30$593
This Iberia deal was found by Cheapflights users on 7/31. 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 11/912:21 pmDEN - OPO
2 stops16h 24mIberia
Tue 11/188:20 amOPO - DEN
2 stops20h 59mIberia
Deal found 7/31$608
This Mytrip deal was found by Cheapflights users on 7/31. 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 9/229:40 amDEN - OPO
2 stops22h 25mMultiple Airlines
Tue 10/710:50 pmOPO - DEN
2 stops21h 55mMultiple Airlines
Deal found 7/31$625
This KAYAK deal was found by Cheapflights users on 7/31. 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 11/812:43 pmDEN - OPO
2 stops45h 02mScandinavian Airlines
Mon 11/175:35 pmOPO - DEN
2 stops36h 11mScandinavian Airlines
Deal found 7/31$644
This Ovago deal was found by Cheapflights users on 7/31. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/45:25 pmDEN - OPO
1 stop16h 50mBritish Airways
Thu 12/114:55 pmOPO - DEN
1 stop29h 35mBritish Airways
Deal found 7/31$688
This Lufthansa deal was found by Cheapflights users on 7/30. 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 10/135:59 pmDEN - OPO
1 stop21h 51mLufthansa
Tue 10/216:00 amOPO - DEN
2 stops17h 03mLufthansa
Deal found 7/30$692
This KLM deal was found by Cheapflights users on 7/31. 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.
Sun 11/910:50 amDEN - OPO
2 stops16h 40mKLM
Mon 11/174:10 pmOPO - DEN
2 stops29h 59mKLM
Deal found 7/31$740
This oojo deal was found by Cheapflights users on 8/1. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/237:50 pmDEN - OPO
1 stop37h 00mTurkish Airlines
Wed 10/810:50 amOPO - DEN
1 stop38h 05mTurkish Airlines
Deal found 8/1$800

Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado 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 1, 2025.
Use the filters below to find and compare flights from Colorado to Porto that are best for you.

Fly from

Colorado

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

Sun 11/9

12:21 pm-11:45 am

2 stops16h 24m

Porto

Tue 11/18

8:20 am-10:19 pm

2 stops20h 59m

$608

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 9/22

9:40 am-3:05 pm

2 stops22h 25m

Porto

Tue 10/7

10:50 pm-1:45 pm

2 stops21h 55m

$625

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sat 11/8

12:43 pm-4:45 pm

2 stops45h 02m

Porto

Mon 11/17

5:35 pm-10:46 pm

2 stops36h 11m

$644

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 12/4

5:25 pm-5:15 pm

1 stop16h 50m

Porto

Thu 12/11

4:55 pm-3:30 pm

1 stop29h 35m

$688

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 10/13

5:59 pm-10:50 pm

1 stop21h 51m

Porto

Tue 10/21

6:00 am-4:03 pm

2 stops17h 03m

$692

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sun 11/9

10:50 am-10:30 am

2 stops16h 40m

Porto

Mon 11/17

4:10 pm-3:09 pm

2 stops29h 59m

$740

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 9/23

7:50 pm-3:50 pm

1 stop37h 00m

Porto

Wed 10/8

10:50 am-5:55 pm

1 stop38h 05m

$800

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 10/6

12:04 am-8:50 am

2 stops49h 46m

$280

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 10/14

5:59 pm-3:45 pm

1 stop14h 46m

$489

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/31

Showing 1-10 of 16 results
1
2

Best time to book a flight from Colorado to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Colorado 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 Colorado to Porto

What is the cheapest month to book a flight from Colorado to Porto?

Currently, January is the cheapest month in which you can book a flight from Colorado to Porto (average of $523). Flying from Colorado to Porto in June is currently the most expensive (average of $1,033). 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 CO to OPO?

Find hourly flight availability from Colorado 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 1, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado to Porto as you normally would.

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 1, 2025.
Get a feel of what it's like to fly with KLM, United Airlines, and Scandinavian Airlines from Colorado to Porto by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Crew

8.4

Food

7.3

Overall

7.8

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
KLM
7.8
Good
1,383 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Crew

8.4

Food

7.3

Overall

7.8

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
United Airlines
7.4
Good
8,900 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Crew

8.4

Food

7.3

Overall

7.8

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Scandinavian Airlines
7.4
Good
1,457 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Crew

8.4

Food

7.3

Overall

7.8

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Turkish Airlines
7.3
Good
3,933 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Crew

8.4

Food

7.3

Overall

7.8

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
WestJet
7.2
Good
2,978 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Crew

8.4

Food

7.3

Overall

7.8

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Related info for your journey

Find useful and relevant information for your journey from Colorado to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Porto from Colorado?

    Porto (OPO), located 6.8 mi from the city center, is the airport you fly into when you book flights from Colorado to Porto.

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

    $489 is the cheapest one-way deal found within the past few days, from Lufthansa. You may also be able to find cheap deals on United Airlines and Air Europa, with prices starting from $589 and $630, respectively.

  • Can I find deals for flights from Colorado to Porto that include hotel bookings?

    Yes. In addition to deals on Colorado to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Colorado to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Colorado to Porto.

  • Can I find deals for business class flights from Colorado to Porto?

    Yes. Cheapflights offers flight deals from Colorado 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 Colorado to Porto?

    Currently, January is the cheapest month in which you can book a flight from Colorado to Porto (average of $523). Flying from Colorado to Porto in June is currently the most expensive (average of $1,033). 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
Coimbra

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Alternative routes for Colorado to Porto

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Colorado to Porto

Discover the top 4 airlines that operate flights from Colorado 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 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$490Average$880FlexibilityNo cancel feeOn-time69%
DeltaCheapest$535Average$1,265FlexibilityNo cancel feeOn-timeN/A
Turkish AirlinesCheapest$574Average$679FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$662Average$933FlexibilityNo cancel feeOn-time76%

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