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$258+ 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 2/4. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — OPO
Jan 24 — Jan 311
Sat 1/24
Sat 1/31
1 adult, Economy
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Cheap 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 December 25, 2025.

This United Airlines deal was found by Cheapflights users on 12/23. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2312:40 amDEN - OPO
2 stops31h 45mUnited Airlines
Wed 12/316:00 amOPO - DEN
2 stops35h 28mUnited Airlines
Deal found 12/23$834
This Ovago deal was found by Cheapflights users on 12/23. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/245:35 pmDEN - OPO
2 stops23h 05mLufthansa
Wed 12/316:00 amOPO - DEN
1 stop14h 40mLufthansa
Deal found 12/23$907
This KLM deal was found by Cheapflights users on 12/23. 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 12/2311:59 pmDEN - OPO
2 stops27h 31mKLM
Tue 12/306:05 amOPO - DEN
2 stops23h 28mKLM
Deal found 12/23$1,238
This United Airlines deal was found by Cheapflights users on 12/23. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2311:59 pmDEN - OPO
2 stops32h 26mUnited Airlines
Tue 12/3012:30 pmOPO - DEN
3 stops58h 22mUnited Airlines
Deal found 12/23$1,306

Find flight deals from Colorado to Porto

Keep the following information in mind while searching for Colorado to Porto flight deals. Data was last updated December 25, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$509
(Iberia)

One-way from

$283
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$1,095
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 Colorado to Porto
Search Deals
One-way flight from Colorado to Porto
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($290 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 December 2025
Search Deals

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 December 25, 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 4/21

6:40 pm-7:30 pm

1 stop17h 50m

Porto

Wed 4/29

8:20 am-9:50 pm

2 stops20h 30m

$509

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 4/21

7:36 am-11:45 am

2 stops21h 09m

Porto

Wed 4/29

8:20 am-11:35 pm

2 stops22h 15m

$521

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Wed 4/8

6:20 pm-6:10 pm

2 stops16h 50m

Porto

Fri 4/17

5:00 am-3:31 pm

2 stops17h 31m

$538

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 4/21

6:40 pm-9:05 am

1 stop31h 25m

Porto

Wed 4/29

8:20 pm-4:30 pm

1 stop27h 10m

$561

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Wed 3/18

6:40 am-10:30 am

2 stops21h 50m

Porto

Thu 4/2

5:00 am-5:17 pm

2 stops19h 17m

$562

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Wed 2/25

11:10 am-10:30 am

2 stops16h 20m

Porto

Tue 3/3

5:00 am-8:05 pm

2 stops22h 05m

$564

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 2/26

12:46 pm-9:30 am

1 stop13h 44m

Porto

Fri 3/6

6:00 am-1:40 pm

1 stop14h 40m

$597

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 2/26

11:30 am-9:30 am

2 stops15h 00m

Porto

Thu 3/5

6:00 am-1:40 pm

1 stop14h 40m

$602

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Sun 2/8

11:15 am-12:05 pm

2 stops17h 50m

Porto

Sun 2/15

6:00 am-7:31 pm

2 stops20h 31m

$604

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 2/26

12:46 pm-9:30 am

1 stop13h 44m

Porto

Tue 3/3

12:35 pm-9:56 pm

1 stop16h 21m

$616

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/25

Showing 1-10 of 20 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, March is the cheapest month in which you can book a flight from Colorado to Porto (average of $574). Flying from Colorado to Porto in June is currently the most expensive (average of $1,116). 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 December 25, 2025.

It’s typically best to fly out from Colorado to Porto in the evening. Doing so could potentially save you 34% on the flight price compared to flying in the afternoon, which is usually more expensive.

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 $538, Iberia can have you in Porto from Colorado in 16h 50m. There are 4747 mi between Colorado and Porto. This flight may include one or multiple stops.

  • 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, March is the cheapest month in which you can book a flight from Colorado to Porto (average of $574). Flying from Colorado to Porto in June is currently the most expensive (average of $1,116). 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
Vila Nova de Gaia

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Alternative routes for Colorado to Porto

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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 December 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$574Average$684FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$641Average$870FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$702Average$1,147FlexibilityNo cancel feeOn-time69%

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