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$254+ 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 4/25. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — OPO
Mar 16 — Mar 231
Mon 3/16
Mon 3/23
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 February 14, 2026.

This United Airlines deal was found by Cheapflights users on 2/10. 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 11/21:45 pm
DEN
-
OPO
1 stop12h 45m
United Airlines
Thu 11/196:00 am
OPO
-
DEN
1 stop17h 00m
United Airlines
Deal found 2/10$488
This United Airlines deal was found by Cheapflights users on 2/10. 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.
Tue 11/310:25 am
DEN
-
OPO
2 stops16h 05m
United Airlines
Thu 11/196:00 am
OPO
-
DEN
1 stop17h 00m
United Airlines
Deal found 2/10$493
This Orbitz deal was found by Cheapflights users on 2/10. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/34:20 pm
DEN
-
OPO
1 stop13h 30m
Multiple Airlines
Tue 11/177:20 pm
OPO
-
DEN
2 stops31h 35m
Multiple Airlines
Deal found 2/10$497
This Air Canada deal was found by Cheapflights users on 2/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/41:25 pm
DEN
-
OPO
2 stops38h 50m
Air Canada
Fri 11/206:00 am
OPO
-
DEN
2 stops33h 50m
Air Canada
Deal found 2/10$502
This KAYAK deal was found by Cheapflights users on 2/10. 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.
Sun 11/15:45 pm
DEN
-
OPO
1 stop21h 40m
Lufthansa
Thu 11/196:00 am
OPO
-
DEN
1 stop17h 00m
Lufthansa
Deal found 2/10$504
This United Airlines deal was found by Cheapflights users on 2/10. 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.
Tue 11/311:15 am
DEN
-
OPO
2 stops15h 15m
United Airlines
Tue 11/1712:35 pm
OPO
-
DEN
1 stop15h 50m
United Airlines
Deal found 2/10$507
This United Airlines deal was found by Cheapflights users on 2/10. 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 11/27:32 am
DEN
-
OPO
2 stops18h 58m
United Airlines
Tue 11/1712:35 pm
OPO
-
DEN
2 stops18h 20m
United Airlines
Deal found 2/10$512
This KAYAK deal was found by Cheapflights users on 2/10. 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.
Mon 11/24:20 pm
DEN
-
OPO
1 stop13h 30m
Lufthansa
Mon 11/1612:30 pm
OPO
-
DEN
1 stop34h 30m
Lufthansa
Deal found 2/10$513
This KAYAK deal was found by Cheapflights users on 2/10. 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.
Sun 11/15:45 pm
DEN
-
OPO
1 stop21h 40m
Lufthansa
Tue 11/171:45 pm
OPO
-
DEN
1 stop31h 50m
Lufthansa
Deal found 2/10$517

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 February 14, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$571
(Travelocity)

One-way from

$254
(Kiwi.com)

Popular in

June

Cheapest in

March

Average price

$989
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. 19% potential increase in price ($230 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($42 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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 February 14, 2026.
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

Mon 3/16

6:25 pm-5:35 pm

1 stop17h 10m

Porto

Mon 3/30

9:10 pm-4:30 pm

1 stop26h 20m

$607

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 2/24

1:25 pm-6:30 pm

2 stops22h 05m

Porto

Wed 3/4

6:00 am-4:00 pm

1 stop17h 00m

$619

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Mon 3/16

6:10 am-10:30 am

2 stops22h 20m

Porto

Mon 3/30

5:00 am-9:46 pm

2 stops23h 46m

$622

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 2/24

12:46 pm-9:30 am

1 stop13h 44m

Porto

Wed 3/4

6:00 am-4:00 pm

1 stop17h 00m

$639

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 3/3

7:45 am-9:30 am

2 stops18h 45m

Porto

Tue 3/10

6:00 am-5:00 pm

1 stop17h 00m

$643

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 5/12

5:40 pm-10:05 pm

1 stop21h 25m

Porto

Sun 5/24

6:30 am-3:40 pm

1 stop16h 10m

$692

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Tue 5/12

5:40 pm-10:05 pm

1 stop21h 25m

Porto

Sun 5/24

6:30 am-3:40 pm

1 stop16h 10m

$692

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Fri 3/27

8:20 pm-8:45 am

1 stop30h 25m

Porto

Thu 4/2

6:10 am-6:25 pm

1 stop19h 15m

$698

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 2/26

1:40 pm-9:30 am

1 stop12h 50m

Porto

Tue 3/3

12:35 pm-9:56 pm

1 stop16h 21m

$707

DenverPorto

DEN - OPO

DENOPO

Denver Intl

Thu 2/26

9:10 am-11:45 am

2 stops19h 35m

Porto

Tue 3/3

8:20 am-9:02 pm

2 stops19h 42m

$711

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/10

Showing 1-10 of 17 results
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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 $1,092). 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.

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 $639, British Airways can have you in Porto from Colorado in 13h 44m. 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 $1,092). 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
Vila Nova de Gaia
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 February 14, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$574Average$690FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$593Average$1,137FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$641Average$871FlexibilityNo cancel feeOn-time76%

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