What airlines fly to Portugal?

United Airlines, British Airways and Lufthansa are the top three most popular airlines that fly to Portugal from Denver according to our data. United Airlines is the first choice among our users, with 56% of people opting to fly with this airline when traveling to Portugal. Keep in mind that there are 10 different airlines that fly to Portugal on a routine basis, so you have a few additional options to choose from.

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

United Airlines, British Airways, and Lufthansa are the most popular carriers operating from Denver Intl to Portugal

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

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

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

There are 10 operators available for flights from Denver Intl Airport to Portugal as of October 2026.

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

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 Portugal.

What documentation or ID do you need to fly to Portugal?

The required travel and health documents for your Portugal 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 Portugal. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$329 Cheap Flights from Denver to Portugal in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Denver to Portugal

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

1:30 pm - 3:05 pmDEN Denver Intl-LIS Lisbon Humberto Delgado

18h 35m2 stops Toronto Pearson Intl Dublin

8:30 pm - 4:50 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

27h 20m2 stops Dublin Toronto Pearson Intl

$537Multiple Airlines

Sat, Dec 5 - Sat, Dec 12

3:40 pm - 8:25 pmDEN Denver Intl-LIS Lisbon Humberto Delgado

21h 45m2 stops Reykjavik Keflavik Intl Dublin

5:55 am - 6:00 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

19h 05m2 stops Dublin Reykjavik Keflavik Intl

$542Multiple Airlines

Thu, Nov 12 - Thu, Nov 19

3:40 pm - 12:45 pmDEN Denver Intl-LIS Lisbon Humberto Delgado

14h 05m1 stop Reykjavik Keflavik Intl

2:00 pm - 6:00 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

35h 00m1 stop Reykjavik Keflavik Intl

$671Icelandair

Mon, Nov 9 - Sun, Nov 22

3:40 pm - 12:45 pmDEN Denver Intl-LIS Lisbon Humberto Delgado

14h 05m1 stop Reykjavik Keflavik Intl

2:00 pm - 6:00 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

35h 00m1 stop Reykjavik Keflavik Intl

$678Icelandair

Mon, Nov 9 - Sun, Nov 22

7:46 am - 9:30 amDEN Denver Intl-OPO Porto

18h 44m1 stop Newark

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

14h 40m1 stop Frankfurt am Main

$701United Airlines

Wed, Feb 24 - Wed, Mar 10

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

11:25 am - 11:50 amDEN Denver Intl-OPO Porto

17h 25m2 stops Montreal Pierre Elliott Trudeau Intl Brussels Bruxelles-National

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

21h 56m2 stops Frankfurt am Main Calgary

$707Air Canada

Wed, Mar 10 - Wed, Mar 24

11:25 am - 11:50 amDEN Denver Intl-OPO Porto

17h 25m2 stops Montreal Pierre Elliott Trudeau Intl Brussels Bruxelles-National

6:00 am - 4:50 pmOPO Porto-DEN Denver Intl

41h 50m2 stops Frankfurt am Main Toronto Pearson Intl

$715Air Canada

Wed, Feb 24 - Wed, Mar 10

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

$716Delta

Sun, Mar 14 - Fri, Mar 19

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 - 8:34 pmOPO Porto-DEN Denver Intl

21h 34m2 stops Amsterdam Schiphol New York John F Kennedy Intl

$716Delta

Sun, Mar 14 - Fri, Mar 19

Cheap last minute flights

Enter your travel dates to find the best prices.

4:17 pm - 7:30 pmDEN Denver Intl-OPO Porto

44h 13m2 stops Toronto Pearson Intl Zurich

4:10 pm - 3:35 pmOPO Porto-DEN Denver Intl

30h 25m1 stop Frankfurt am Main

$845Multiple Airlines

Sat, Oct 24 - Mon, Nov 2

11:25 am - 9:20 amDEN Denver Intl-LIS Lisbon Humberto Delgado

14h 55m1 stop Montreal Pierre Elliott Trudeau Intl

6:05 am - 3:30 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

15h 25m1 stop Munich Franz Josef Strauss

$849Multiple Airlines

Tue, Oct 20 - Thu, Oct 29

6:05 am - 8:10 amDEN Denver Intl-LIS Lisbon Humberto Delgado

20h 05m1 stop Newark

6:00 am - 2:30 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

15h 30m1 stop Munich Franz Josef Strauss

$854United Airlines

Sun, Oct 25 - Mon, Nov 2

6:05 pm - 10:30 amDEN Denver Intl-OPO Porto

33h 25m1 stop Newark

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

16h 35m1 stop Frankfurt am Main

$856United Airlines

Sat, Oct 24 - Mon, Nov 2

5:40 pm - 4:10 pmDEN Denver Intl-OPO Porto

15h 30m1 stop Frankfurt am Main

6:00 am - 2:30 pmOPO Porto-DEN Denver Intl

39h 30m2 stops Frankfurt am Main Munich Franz Josef Strauss

$891Lufthansa

Sat, Oct 24 - Mon, Nov 2

4:05 pm - 10:45 pmDEN Denver Intl-LIS Lisbon Humberto Delgado

23h 40m1 stop Munich Franz Josef Strauss

2:20 pm - 2:30 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

31h 10m1 stop Munich Franz Josef Strauss

$894Lufthansa

Fri, Oct 23 - Mon, Nov 2

11:25 am - 9:20 amDEN Denver Intl-LIS Lisbon Humberto Delgado

14h 55m1 stop Montreal Pierre Elliott Trudeau Intl

10:40 am - 8:27 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

16h 47m1 stop Montreal Pierre Elliott Trudeau Intl

$896Air Canada

Fri, Oct 23 - Sun, Nov 22

7:50 pm - 9:55 amDEN Denver Intl-LIS Lisbon Humberto Delgado

31h 05m2 stops Vancouver Intl Toronto Pearson Intl

5:00 am - 10:35 amLIS Lisbon Humberto Delgado-DEN Denver Intl

36h 35m2 stops Frankfurt am Main Toronto Pearson Intl

$913Air Canada

Fri, Oct 23 - Sun, Nov 22

6:20 am - 11:35 amDEN Denver Intl-OPO Porto

22h 15m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle

6:25 am - 10:32 pmOPO Porto-DEN Denver Intl

23h 07m2 stops Paris Charles de Gaulle Atlanta Hartsfield-Jackson

$916Delta

Sat, Oct 24 - Mon, Nov 2

12:15 pm - 8:00 amDEN Denver Intl-LIS Lisbon Humberto Delgado

12h 45m1 stop New York John F Kennedy Intl

5:30 am - 5:32 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

18h 02m2 stops Paris Charles de Gaulle Detroit Metropolitan Wayne County

$930Delta

Tue, Oct 20 - Thu, Oct 29

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United Airlines flights from Denver to Portugal

Our best United Airlines deals on Denver to Portugal flight tickets

United Airlines

Mar 2

DEN10:10 amDenver Intl

16h 20m

1 stop

OPO9:30 amPorto

Mar 5

OPO6:00 amPorto

14h 40m

1 stop

DEN1:40 pmDenver Intl

$701

United Airlines

Mar 2

DEN5:00 amDenver Intl

21h 30m

2 stops

OPO9:30 amPorto

Mar 5

OPO6:00 amPorto

14h 40m

1 stop

DEN1:40 pmDenver Intl

$705

United Airlines

Apr 13

DEN11:15 amDenver Intl

15h 30m

2 stops

OPO9:45 amPorto

Apr 30

OPO6:00 amPorto

19h 00m

2 stops

DEN6:00 pmDenver Intl

$715

Icelandair flights from Denver to Portugal

Our best Icelandair deals on Denver to Portugal flight tickets

Icelandair

Nov 9

DEN3:40 pmDenver Intl

14h 05m

1 stop

LIS12:45 pmLisbon Humberto Delgado

Nov 22

LIS2:00 pmLisbon Humberto Delgado

35h 00m

1 stop

DEN6:00 pmDenver Intl

$671

Icelandair

Nov 9

DEN3:40 pmDenver Intl

14h 05m

1 stop

LIS12:45 pmLisbon Humberto Delgado

Nov 22

LIS2:00 pmLisbon Humberto Delgado

35h 00m

1 stop

DEN6:00 pmDenver Intl

$678

Icelandair

Nov 9

DEN3:40 pmDenver Intl

14h 05m

1 stop

LIS12:45 pmLisbon Humberto Delgado

Nov 22

LIS2:00 pmLisbon Humberto Delgado

35h 00m

1 stop

DEN6:00 pmDenver Intl

$688

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DenverLisbon

DEN Denver Intl - LIS Lisbon Humberto Delgado

DENLIS

Denver Intl

Sat 12/5

1:30 pm-3:05 pm

2 stops18h 35m

Lisbon Humberto Delgado

Sat 12/12

8:30 pm-4:50 pm

2 stops27h 20m

$537

DenverLisbon

DEN Denver Intl - LIS Lisbon Humberto Delgado

DENLIS

Denver Intl

Thu 11/12

3:40 pm-8:25 pm

2 stops21h 45m

Lisbon Humberto Delgado

Thu 11/19

5:55 am-6:00 pm

2 stops19h 05m

$542

DenverLisbon

DEN Denver Intl - LIS Lisbon Humberto Delgado

DENLIS

Denver Intl

Mon 11/9

3:40 pm-12:45 pm

1 stop14h 05m

Lisbon Humberto Delgado

Sun 11/22

2:00 pm-6:00 pm

1 stop35h 00m

$671

DenverLisbon

DEN Denver Intl - LIS Lisbon Humberto Delgado

DENLIS

Denver Intl

Mon 11/9

3:40 pm-12:45 pm

1 stop14h 05m

Lisbon Humberto Delgado

Sun 11/22

2:00 pm-6:00 pm

1 stop35h 00m

$678

DenverPorto

DEN Denver Intl - OPO Porto

DENOPO

Denver Intl

Wed 2/24

7:46 am-9:30 am

1 stop18h 44m

Porto

Wed 3/10

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

Wed 3/10

11:25 am-11:50 am

2 stops17h 25m

Porto

Wed 3/24

6:00 am-9:56 pm

2 stops21h 56m

$707

DenverPorto

DEN Denver Intl - OPO Porto

DENOPO

Denver Intl

Wed 2/24

11:25 am-11:50 am

2 stops17h 25m

Porto

Wed 3/10

6:00 am-4:50 pm

2 stops41h 50m

$715

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

$716

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-8:34 pm

2 stops21h 34m

$716

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 Portugal

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

What is the cheapest month to fly to Portugal?

The cheapest month to fly to Portugal from Denver is in February. Flight prices, which tend to average around $638, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of February, then book flights to Portugal from Denver during January instead. Flights to Portugal in January, while not as cheap as those in February, still average around $750.

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

You are more likely to see cheaper flights to Portugal from Denver when booking weeks ahead of your departure date. In general, you can expect to find flights to Portugal for around $940 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portugal from Denver for as low as $818 on momondo.

Can stopping save me money on Denver to Portugal flights?

You could potentially save up to 16% on your flight if you consider stops on a Denver to Portugal flight.

Cheap Denver to Portugal flight deals and tips

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

Best Price Found	$329
Fastest flight time	12h 15m
Direct flights	None

The best one-way flight to Portugal from Denver in the past 72 hours is $329. The best round-trip flight deal from Denver to Portugal found on momondo in the last 72 hours is $537.

The fastest flight from Denver to Portugal takes 12h 15m

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

Search flight deals

Frequently asked questions about flying from Denver to Portugal

When did momondo last update prices for flights from Denver Intl Airport to Portugal?
Prices for flights from Denver Intl Airport to Portugal are refreshed on a daily basis.
How many operators does momondo search for flights from Denver Intl Airport to Portugal?
There are 10 operators available for flights from Denver Intl Airport to Portugal as of October 2026.
How old do you have to be to fly from Denver Intl Airport to Portugal?
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 Portugal.
What documentation or ID do you need to fly to Portugal?
The required travel and health documents for your Portugal 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 Portugal. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Denver to Portugal

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

Airline	Rating	Free Cancellation	Price
Icelandair	PriceFrom $464	Free Cancellation	Rating 6.9 763 reviews	Search Icelandair flights
Lufthansa	PriceFrom $485	Free Cancellation	Rating 6.8 8,282 reviews	Search Lufthansa flights
KLM	PriceFrom $551	Free Cancellation	Rating 7.8 1,591 reviews	Search KLM flights
Virgin Atlantic	PriceFrom $575	Free Cancellation	Rating 7.5 696 reviews	Search Virgin Atlantic flights
United Airlines	PriceFrom $576	Free Cancellation	Rating 7.3 10,390 reviews	Search United Airlines flights
British Airways	PriceFrom $603	Free Cancellation	Rating 6.7 8,266 reviews	Search British Airways flights
Delta	PriceFrom $620	Free Cancellation	Rating 7.8 8,649 reviews	Search Delta flights
American Airlines	PriceFrom $630	Free Cancellation	Rating 7.0 12,181 reviews	Search American Airlines flights
Turkish Airlines	PriceFrom $640	Free Cancellation	Rating 7.4 4,457 reviews	Search Turkish Airlines flights
Air Canada	PriceFrom $700	Free Cancellation	Rating 7.1 11,783 reviews	Search Air Canada flights

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Denver to Portugal. momondo saves you time and could save you money on your trip.

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

Flights from Denver to Portugal with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search for Denver to Portugal flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Yes momondo offers price alerts on flights to Portugal from Denver. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Portugal 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.

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Find better results for your trip to Portugal

Popular cities

Other flights from Denver

Other flights to Portugal

Airlines

Cabin classes

Complete your trip

Feeling lucky

Popular cities in Portugal

Flights to Lisbonfrom $405

Flights to Portofrom $396

Flights to Funchalfrom $405

Flights to Farofrom $570

Flights to Ponta Delgadafrom $553

Flights to Lajesfrom $554

Flights to Hortafrom $550

Flights to Pico Islandfrom $557

Flights to Porto Santofrom $1,072

Flights to Velasfrom $557

Cheap flights from Denver to Portugal from $329

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 Portugal departing on 3/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Denver to Portugal

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Big names and deals

Big names and deals

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Trusted and free

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United Airlines flights from Denver to Portugal

Our best United Airlines deals on Denver to Portugal flight tickets

Icelandair flights from Denver to Portugal

Our best Icelandair deals on Denver to Portugal flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Denver to Portugal that are best for you.

See travel insights to Portugal from

How to get the cheapest flight ticket from Denver to Portugal

What is the cheapest month to fly to Portugal?

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

Can stopping save me money on Denver to Portugal flights?

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

What airlines fly to Portugal?

Cheap Denver to Portugal flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Denver to Portugal

Best airlines flying from Denver to Portugal

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

Why use momondo?

An easier way to manage your Portugal 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

Popular cities in Portugal

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

Denver flight routes

According to popular flight searches on momondo this year

Portugal flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to Portugal

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

Cabin classes currently available on flights to Portugal

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

Complete your trip to Portugal

Explore popular destinations other users love

According to popular flight searches on momondo this year