Which layover airport offers the lowest fares from Denver to Porto?

Flights via Montreal (YUL) offer the lowest average round-trip price of $1,349.

Which layover airport has the shortest travel time from Denver to Porto?

Flights connecting via Montreal (YUL) have the shortest average one-way travel time: 13h 33m.

What is the cheapest airline that flies from Denver Intl to Porto?

United Airlines and Air Canada are the most popular carriers operating from Denver Intl to Porto

Which airport is the most popular layover for flights between Denver and Porto?

Montreal (YUL) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest connection time from Denver to Porto?

Frankfurt am Main (FRA) has the shortest average layover time for this route: 2h 03m.

What airlines fly to Porto?

United Airlines, Lufthansa and Air Canada are the top three most popular airlines that fly to Porto from Denver according to our data. United Airlines is the first choice among our users, with 64% of people opting to fly with this airline when traveling to Porto. Keep in mind that there are 5 different airlines that fly to Porto on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Denver Intl Airport to Porto Airport?

Prices for flights from Denver Intl Airport to Porto Airport are refreshed on a daily basis.

How many operators does momondo search for flights from Denver Intl Airport to Porto Airport?

As of October 2026, there are 5 operators available to choose from for flights from Denver Intl Airport to Porto Airport.

How old do you have to be to fly from Denver Intl Airport to Porto Airport?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Denver Intl Airport to Porto Airport.

What documentation or ID do you need to fly to Porto Airport?

The required travel and health documents for your Porto Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Porto Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$333 Cheap Flights from Denver to Porto in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Denver to Porto

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

4:15 pm - 12:50 pmDEN Denver Intl-OPO Porto

13h 35m1 stop Munich Franz Josef Strauss

6:00 am - 3:35 pmOPO Porto-DEN Denver Intl

16h 35m1 stop Frankfurt am Main

$684Lufthansa

Tue, Feb 16 - Wed, Mar 10

4:15 pm - 12:50 pmDEN Denver Intl-OPO Porto

13h 35m1 stop Munich Franz Josef Strauss

6:00 am - 3:35 pmOPO Porto-DEN Denver Intl

16h 35m1 stop Frankfurt am Main

$684Lufthansa

Mon, Jan 4 - Thu, Jan 14

4:15 pm - 12:50 pmDEN Denver Intl-OPO Porto

13h 35m1 stop Munich Franz Josef Strauss

6:00 am - 9:56 pmOPO Porto-DEN Denver Intl

22h 56m2 stops Frankfurt am Main Calgary

$684Multiple Airlines

Tue, Feb 16 - Wed, Mar 10

11:20 am - 12:05 pmDEN Denver Intl-OPO Porto

18h 45m2 stops Montreal Pierre Elliott Trudeau Intl Brussels Bruxelles-National

6:00 am - 4:35 pmOPO Porto-DEN Denver Intl

16h 35m1 stop Frankfurt am Main

$685Multiple Airlines

Sun, Mar 14 - Wed, Mar 24

10:10 am - 9:30 amDEN Denver Intl-OPO Porto

16h 20m1 stop Newark

6:00 am - 1:40 pmOPO Porto-DEN Denver Intl

14h 40m1 stop Frankfurt am Main

$701United Airlines

Tue, Mar 2 - Fri, Mar 5

11:30 am - 9:30 amDEN Denver Intl-OPO Porto

15h 00m1 stop Newark

6:00 am - 1:40 pmOPO Porto-DEN Denver Intl

14h 40m1 stop Frankfurt am Main

$701United Airlines

Tue, Mar 2 - Fri, Mar 5

6:30 am - 10:35 amDEN Denver Intl-OPO Porto

22h 05m2 stops New York John F Kennedy Intl Paris Charles de Gaulle

5:00 am - 11:28 pmOPO Porto-DEN Denver Intl

24h 28m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

$717Delta

Sun, Mar 14 - Fri, Mar 19

6:45 am - 10:35 amDEN Denver Intl-OPO Porto

20h 50m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle

5:00 am - 5:30 pmOPO Porto-DEN Denver Intl

19h 30m2 stops Amsterdam Schiphol Detroit Metropolitan Wayne County

$717Delta

Mon, Feb 15 - Thu, Mar 11

11:25 am - 12:05 pmDEN Denver Intl-OPO Porto

17h 40m2 stops Montreal Pierre Elliott Trudeau Intl Brussels Bruxelles-National

6:00 am - 8:37 amOPO Porto-DEN Denver Intl

33h 37m2 stops Frankfurt am Main Calgary

$722Air Canada

Tue, Nov 10 - Tue, Nov 17

1:30 pm - 12:50 pmDEN Denver Intl-OPO Porto

16h 20m2 stops Toronto Pearson Intl Munich Franz Josef Strauss

6:00 am - 8:37 amOPO Porto-DEN Denver Intl

33h 37m2 stops Frankfurt am Main Calgary

$726Air Canada

Sun, Nov 1 - Tue, Nov 17

Cheap last minute flights

Enter your travel dates to find the best prices.

5:40 pm - 10:00 pmDEN Denver Intl-OPO Porto

21h 20m1 stop Paris Charles de Gaulle

5:00 am - 11:55 pmOPO Porto-DEN Denver Intl

25h 55m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

$1,181Delta

Wed, Oct 7 - Fri, Oct 16

5:40 pm - 3:25 pmDEN Denver Intl-OPO Porto

14h 45m1 stop Paris Charles de Gaulle

5:00 am - 3:49 pmOPO Porto-DEN Denver Intl

17h 49m2 stops Amsterdam Schiphol Minneapolis St Paul

$1,181Delta

Wed, Oct 7 - Thu, Oct 15

5:40 pm - 3:40 pmDEN Denver Intl-OPO Porto

15h 00m1 stop Frankfurt am Main

6:00 am - 1:35 pmOPO Porto-DEN Denver Intl

14h 35m1 stop Frankfurt am Main

$1,186United Airlines

Wed, Oct 7 - Thu, Oct 15

5:40 pm - 3:40 pmDEN Denver Intl-OPO Porto

15h 00m1 stop Frankfurt am Main

6:00 am - 3:40 pmOPO Porto-DEN Denver Intl

16h 40m1 stop Frankfurt am Main

$1,186United Airlines

Wed, Oct 7 - Fri, Oct 16

6:10 pm - 10:55 pmDEN Denver Intl-OPO Porto

21h 45m2 stops Chicago O'Hare Intl Frankfurt am Main

4:35 pm - 3:40 pmOPO Porto-DEN Denver Intl

30h 05m1 stop Frankfurt am Main

$1,228Lufthansa

Wed, Oct 7 - Mon, Oct 19

6:10 pm - 10:55 pmDEN Denver Intl-OPO Porto

21h 45m2 stops Chicago O'Hare Intl Frankfurt am Main

12:10 pm - 4:22 pmOPO Porto-DEN Denver Intl

35h 12m2 stops Frankfurt am Main Chicago O'Hare Intl

$1,238Lufthansa

Wed, Oct 7 - Mon, Oct 19

5:45 pm - 3:30 pmDEN Denver Intl-OPO Porto

14h 45m2 stops Minneapolis St Paul Amsterdam Schiphol

5:00 am - 4:56 pmOPO Porto-DEN Denver Intl

18h 56m2 stops Amsterdam Schiphol Salt Lake City

$1,250KLM

Fri, Oct 2 - Thu, Oct 8

5:45 pm - 3:30 pmDEN Denver Intl-OPO Porto

14h 45m2 stops Minneapolis St Paul Amsterdam Schiphol

5:00 am - 3:49 pmOPO Porto-DEN Denver Intl

17h 49m2 stops Amsterdam Schiphol Minneapolis St Paul

$1,251KLM

Fri, Oct 2 - Fri, Oct 9

6:05 pm - 7:00 amDEN Denver Intl-OPO Porto

53h 55m2 stops Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl

11:20 am - 2:32 pmOPO Porto-DEN Denver Intl

34h 12m2 stops Montreal Pierre Elliott Trudeau Intl Chicago O'Hare Intl

$1,521Air Canada

Sat, Oct 3 - Wed, Oct 7

6:05 pm - 7:00 amDEN Denver Intl-OPO Porto

53h 55m2 stops Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl

11:50 am - 6:46 pmOPO Porto-DEN Denver Intl

13h 56m1 stop Montreal Pierre Elliott Trudeau Intl

$1,534Air Canada

Sat, Oct 3 - Thu, Oct 8

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Lufthansa flights from Denver to Porto

Our best Lufthansa deals on Denver to Porto flight tickets

Lufthansa

Feb 16

DEN4:15 pmDenver Intl

13h 35m

1 stop

OPO12:50 pmPorto

Mar 10

OPO6:00 amPorto

16h 35m

1 stop

DEN3:35 pmDenver Intl

$684

Lufthansa

Nov 10

DEN4:15 pmDenver Intl

13h 35m

1 stop

OPO12:50 pmPorto

Nov 17

OPO6:00 amPorto

16h 35m

1 stop

DEN3:35 pmDenver Intl

$693

Lufthansa

Mar 16

DEN5:15 pmDenver Intl

13h 35m

1 stop

OPO12:50 pmPorto

Mar 23

OPO6:00 amPorto

16h 35m

1 stop

DEN4:35 pmDenver Intl

$695

United Airlines flights from Denver to Porto

Our best United Airlines deals on Denver to Porto flight tickets

United Airlines

Mar 2

DEN11:30 amDenver Intl

15h 00m

1 stop

OPO9:30 amPorto

Mar 5

OPO6:00 amPorto

14h 40m

1 stop

DEN1:40 pmDenver Intl

$701

United Airlines

Mar 2

DEN9:48 amDenver Intl

16h 42m

2 stops

OPO9:30 amPorto

Mar 5

OPO6:00 amPorto

14h 40m

1 stop

DEN1:40 pmDenver Intl

$706

United Airlines

Feb 17

DEN3:55 pmDenver Intl

16h 25m

1 stop

OPO3:20 pmPorto

Mar 12

OPO6:00 amPorto

14h 40m

1 stop

DEN1:40 pmDenver Intl

$716

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DenverPorto

DEN Denver Intl - OPO Porto

DENOPO

Denver Intl

Tue 2/16

4:15 pm-12:50 pm

1 stop13h 35m

Porto

Wed 3/10

6:00 am-3:35 pm

1 stop16h 35m

$684

DenverPorto

DEN Denver Intl - OPO Porto

DENOPO

Denver Intl

Mon 1/4

4:15 pm-12:50 pm

1 stop13h 35m

Porto

Thu 1/14

6:00 am-3:35 pm

1 stop16h 35m

$684

DenverPorto

DEN Denver Intl - OPO Porto

DENOPO

Denver Intl

Tue 2/16

4:15 pm-12:50 pm

1 stop13h 35m

Porto

Wed 3/10

6:00 am-9:56 pm

2 stops22h 56m

$684

DenverPorto

DEN Denver Intl - OPO Porto

DENOPO

Denver Intl

Sun 3/14

11:20 am-12:05 pm

2 stops18h 45m

Porto

Wed 3/24

6:00 am-4:35 pm

1 stop16h 35m

$685

DenverPorto

DEN Denver Intl - OPO Porto

DENOPO

Denver Intl

Tue 3/2

10:10 am-9:30 am

1 stop16h 20m

Porto

Fri 3/5

6:00 am-1:40 pm

1 stop14h 40m

$701

Quickest round-trip

DenverPorto

DEN Denver Intl - OPO Porto

DENOPO

Denver Intl

Tue 3/2

11:30 am-9:30 am

1 stop15h 00m

Porto

Fri 3/5

6:00 am-1:40 pm

1 stop14h 40m

$701

DenverPorto

DEN Denver Intl - OPO Porto

DENOPO

Denver Intl

Sun 3/14

6:30 am-10:35 am

2 stops22h 05m

Porto

Fri 3/19

5:00 am-11:28 pm

2 stops24h 28m

$717

DenverPorto

DEN Denver Intl - OPO Porto

DENOPO

Denver Intl

Mon 2/15

6:45 am-10:35 am

2 stops20h 50m

Porto

Thu 3/11

5:00 am-5:30 pm

2 stops19h 30m

$717

DenverPorto

DEN Denver Intl - OPO Porto

DENOPO

Denver Intl

Tue 11/10

11:25 am-12:05 pm

2 stops17h 40m

Porto

Tue 11/17

6:00 am-8:37 am

2 stops33h 37m

$722

DenverPorto

DEN Denver Intl - OPO Porto

DENOPO

Denver Intl

Sun 11/1

1:30 pm-12:50 pm

2 stops16h 20m

Porto

Tue 11/17

6:00 am-8:37 am

2 stops33h 37m

$726

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Denver to Porto

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Layovers

What is the typical price of a round-trip flight between Denver and Porto?

Prices are currently low for flights on this route.

Typical prices usually range from $706 to $1,113.
The lowest price recently found on this route was $684.

What is the cheapest month to fly to Porto?

The month of November is, on average, the cheapest month to fly to Porto from Denver, with most prices found around $688. If you aren’t able to travel during the month of November, then book flights to Porto from Denver during February instead. Flights to Porto in February, while not as cheap as those in November, still average around $710.

How far in advance should I book a flight from Denver to Porto?

You are more likely to see cheaper flights to Porto from Denver when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $953 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from Denver for as low as $806 on momondo.

How have Denver to Porto flight prices changed over time?

As of October 2026, prices for Denver to Porto flights are approximately 32% cheaper when compared to flights at the same time last year.

When to book flights from Denver to Porto

Are you open to changing your travel dates? Check out the ideal times to fly from Denver to Porto according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Denver to Porto (DEN to OPO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Denver to Porto

Best Price Found	$333
Fastest flight time	12h 35m
Direct flights	None

The best one-way flight to Porto from Denver in the past 72 hours is $333. The best round-trip flight deal from Denver to Porto found on momondo in the last 72 hours is $684.

The fastest flight from Denver to Porto takes 12h 35m

There are no direct flights from Denver to Porto. There are no popular flight routes from Denver to Porto.

Search flight deals

Frequently asked questions about flying from Denver to Porto

How far is Denver Intl to Porto by plane?
A flight from Denver Intl to Porto will travel around 4771.4 mi. Flights usually cover this in 12h 35m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Denver Intl Airport to Porto Airport?
Prices for flights from Denver Intl Airport to Porto Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Denver Intl Airport to Porto Airport?
As of October 2026, there are 5 operators available to choose from for flights from Denver Intl Airport to Porto Airport.
How old do you have to be to fly from Denver Intl Airport to Porto Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Denver Intl Airport to Porto Airport.
What documentation or ID do you need to fly to Porto Airport?
The required travel and health documents for your Porto Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Porto Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular airline from Denver to Porto?
Based on momondo bookings for flights between Denver and Porto, the leading airline is United Airlines, making up 58% of the total bookings. Other popular airlines include Lufthansa with 17%, Air Canada with 10%, and Turkish Airlines with 8%.

Best airlines flying from Denver to Porto

Compare and see reviews for airlines that fly from Denver to Porto with momondo

Airline	Rating	Free Cancellation	Price
Lufthansa	PriceFrom $485	Free Cancellation	Rating 6.8 8,254 reviews	Search Lufthansa flights
United Airlines	PriceFrom $592	Free Cancellation	Rating 7.4 10,274 reviews	Search United Airlines flights
Air Canada	PriceFrom $700	Free Cancellation	Rating 7.1 11,711 reviews	Search Air Canada flights
Turkish Airlines	PriceFrom $701	Free Cancellation	Rating 7.4 4,454 reviews	Search Turkish Airlines flights
Delta	PriceFrom $764	Free Cancellation	Rating 7.8 8,619 reviews	Search Delta flights

Coimbra

Vila Nova de Gaia

Braga

Aveiro

Pinhao

Matosinhos

Esposende

Chaves

Viseu

Arcos de Valdevez

Espinho

Guimarães

Lamego

Ponte de Lima

Penafiel

Caminha

Mira

Why use momondo?

Why should I use momondo to find a flight deal from Denver to Porto?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Denver to Porto for you.

Can I find flights from Denver to Porto with flexible booking policies on momondo?

Yes. All flights to Porto from Denver on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Denver to Porto?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Denver to Porto.

I’m not ready to book a flight from Denver to Porto right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Denver to Porto flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Cheap flights from Denver to Porto from $333

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Denver to Porto departing on 1/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Lufthansa flights from Denver to Porto

Our best Lufthansa deals on Denver to Porto flight tickets

United Airlines flights from Denver to Porto

Our best United Airlines deals on Denver to Porto flight tickets

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How to get the cheapest flight ticket from Denver to Porto

What is the typical price of a round-trip flight between Denver and Porto?

What is the cheapest month to fly to Porto?

How far in advance should I book a flight from Denver to Porto?

How have Denver to Porto flight prices changed over time?

What is the cheapest airline that flies from Denver Intl to Porto?

What airlines fly to Porto?

Which airport is the most popular layover for flights between Denver and Porto?

Which layover airport offers the lowest fares from Denver to Porto?

Which layover airport has the shortest travel time from Denver to Porto?

Which layover airport has the shortest connection time from Denver to Porto?

When to book flights from Denver to Porto

Cheap Denver to Porto (DEN to OPO) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Denver to Porto

Best airlines flying from Denver to Porto

Compare and see reviews for airlines that fly from Denver to Porto with momondo

Traveling to a place near Porto?

Why use momondo?

An easier way to manage your Porto trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Portugal

Airports servicing Portugal

Fly your favorite airline to Porto

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Porto

List of cabin classes available on flights landing in Porto. Availability may vary depending on flight origin and airline.

Popular cities in Portugal

Popular flights according to clicks in the last 7 days on momondo

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