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$282+ 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — OPO
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
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 September 17, 2025.

Round-trip from

$578
(American Airlines)

One-way from

$282
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$962
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. 23% potential increase in price ($298 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($47 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 17, 2025.

This American Airlines deal was found by Cheapflights users on 9/15. 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.
Tue 11/46:23 amDEN - OPO
2 stops18h 17mAmerican Airlines
Wed 11/128:20 amOPO - DEN
2 stops21h 02mAmerican Airlines
Deal found 9/15$578
This Mytrip deal was found by Cheapflights users on 9/17. 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.
Sat 12/63:40 pmDEN - OPO
3 stops22h 35mMultiple Airlines
Sat 12/136:05 amOPO - DEN
2 stops19h 00mMultiple Airlines
Deal found 9/17$593
This United Airlines deal was found by Cheapflights users on 9/15. 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 11/412:45 pmDEN - OPO
1 stop13h 45mUnited Airlines
Wed 11/126:00 amOPO - DEN
1 stop17h 00mUnited Airlines
Deal found 9/15$600
This United Airlines deal was found by Cheapflights users on 9/16. 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 10/274:10 pmDEN - OPO
1 stop11h 20mUnited Airlines
Fri 11/712:30 pmOPO - DEN
2 stops17h 45mUnited Airlines
Deal found 9/16$610
This United deal was found by Cheapflights users on 9/16. 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.
Mon 10/2711:45 amDEN - OPO
1 stop15h 45mMultiple Airlines
Fri 11/76:15 amOPO - DEN
1 stop15h 20mMultiple Airlines
Deal found 9/16$611
This American Airlines deal was found by Cheapflights users on 9/16. 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.
Sun 11/912:32 pmDEN - OPO
2 stops16h 13mAmerican Airlines
Sun 11/168:20 amOPO - DEN
2 stops21h 02mAmerican Airlines
Deal found 9/16$628
This Iberia deal was found by Cheapflights users on 9/15. 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.
Thu 10/3010:40 amDEN - OPO
2 stops19h 05mIberia
Thu 11/68:40 pmOPO - DEN
2 stops32h 42mIberia
Deal found 9/15$639
This FlightHub deal was found by Cheapflights users on 9/16. 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 9/237:50 pmDEN - OPO
1 stop31h 15mTurkish Airlines
Wed 10/810:50 amOPO - DEN
1 stop38h 05mTurkish Airlines
Deal found 9/16$644
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Thu 10/304:10 pmDEN - OPO
1 stop11h 20mUnited Airlines
Thu 11/66:00 amOPO - DEN
1 stop17h 00mUnited Airlines
Deal found 9/15$650
This Mytrip deal was found by Cheapflights users on 9/15. 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.
Tue 11/411:15 amDEN - OPO
3 stops22h 45mMultiple Airlines
Wed 11/127:35 amOPO - DEN
2 stops19h 20mMultiple Airlines
Deal found 9/15$651
This Orbitz deal was found by Cheapflights users on 9/17. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/65:30 pmDEN - OPO
2 stops35h 15mIberia
Sat 12/138:40 pmOPO - DEN
2 stops25h 50mIberia
Deal found 9/17$653

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 September 17, 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

Wed 3/4

1:45 pm-9:30 am

1 stop12h 45m

Porto

Thu 3/19

6:00 am-2:40 pm

1 stop14h 40m

$600

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 3/3

11:15 am-9:30 am

2 stops15h 15m

Porto

Tue 3/17

6:00 am-2:40 pm

1 stop14h 40m

$600

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 11/4

12:45 pm-9:30 am

1 stop13h 45m

Porto

Wed 11/12

6:00 am-4:00 pm

1 stop17h 00m

$600

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 3/3

1:45 pm-9:30 am

1 stop12h 45m

Porto

Thu 3/19

6:00 am-2:40 pm

1 stop14h 40m

$600

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Wed 3/4

11:15 am-9:30 am

2 stops15h 15m

Porto

Tue 3/17

6:00 am-2:40 pm

1 stop14h 40m

$604

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sun 3/1

7:49 am-9:30 am

2 stops18h 41m

Porto

Thu 3/19

6:00 am-2:40 pm

1 stop14h 40m

$604

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sun 3/1

7:49 am-9:30 am

2 stops18h 41m

Porto

Tue 3/17

6:00 am-2:40 pm

1 stop14h 40m

$604

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 10/27

4:10 pm-9:30 am

1 stop11h 20m

Porto

Fri 11/7

12:30 pm-11:15 pm

2 stops17h 45m

$610

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Wed 10/15

6:10 am-3:25 pm

3 stops26h 15m

$282

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 10/16

7:50 pm-9:45 am

1 stop30h 55m

$521

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 12 results
1
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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 $1,028). 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 September 17, 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.

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

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.

  • How long is the flight from Colorado to Porto?

    For as low as $600, United Airlines can have you in Porto from Colorado in 12h 45m. There are 4747 mi between Colorado and Porto.

  • 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 $1,028). 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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See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Colorado to Porto

Discover the top 3 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$574Average$679FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$663Average$900FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$750Average$1,035FlexibilityNo cancel feeOn-time69%

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