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

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

What airlines fly to Portugal?

United Airlines, Lufthansa and British Airways 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 58% of people opting to fly with this airline when traveling to Portugal. Keep in mind that there are 11 different airlines that fly to Portugal 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 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 11 operators available for flights from Denver Intl Airport to Portugal as of August 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.

$327 Cheap Flights from Denver to Portugal in 2026

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.

3:40 pm - 12:50 pmDEN Denver Intl-LIS Lisbon Humberto Delgado

14h 10m1 stop Reykjavik Keflavik Intl

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

35h 00m1 stop Reykjavik Keflavik Intl

$680Icelandair

Mon, Nov 2 - Tue, Nov 24

4:40 pm - 12:50 pmDEN Denver Intl-LIS Lisbon Humberto Delgado

14h 10m1 stop Reykjavik Keflavik Intl

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

35h 00m1 stop Reykjavik Keflavik Intl

$681Icelandair

Sat, Oct 31 - Tue, Nov 10

4:15 pm - 1:30 pmDEN Denver Intl-LIS Lisbon Humberto Delgado

14h 15m1 stop Munich Franz Josef Strauss

5:00 am - 3:35 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

17h 35m1 stop Frankfurt am Main

$705Lufthansa

Tue, Nov 10 - Tue, Nov 24

6:05 pm - 11:05 amDEN Denver Intl-LIS Lisbon Humberto Delgado

34h 00m1 stop Toronto Pearson Intl

5:00 am - 3:35 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

17h 35m1 stop Frankfurt am Main

$706Multiple Airlines

Mon, Oct 12 - Wed, Nov 11

11:20 am - 6:55 amDEN Denver Intl-LIS Lisbon Humberto Delgado

13h 35m1 stop Montreal Pierre Elliott Trudeau Intl

5:00 am - 3:35 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

17h 35m1 stop Frankfurt am Main

$707Multiple Airlines

Wed, Oct 28 - Fri, Nov 6

4:15 pm - 1:30 pmDEN Denver Intl-LIS Lisbon Humberto Delgado

14h 15m1 stop Munich Franz Josef Strauss

5:00 am - 3:35 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

17h 35m1 stop Frankfurt am Main

$708Lufthansa

Mon, Nov 2 - Wed, Nov 25

11:20 am - 6:55 amDEN Denver Intl-LIS Lisbon Humberto Delgado

12h 35m1 stop Montreal Pierre Elliott Trudeau Intl

11:20 am - 8:27 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

16h 07m1 stop Montreal Pierre Elliott Trudeau Intl

$712Air Canada

Wed, Nov 18 - Fri, Nov 27

11:20 am - 6:55 amDEN Denver Intl-LIS Lisbon Humberto Delgado

13h 35m1 stop Montreal Pierre Elliott Trudeau Intl

5:00 am - 1:40 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

15h 40m1 stop Frankfurt am Main

$723United Airlines

Wed, Oct 28 - Fri, Nov 6

11:20 am - 6:55 amDEN Denver Intl-LIS Lisbon Humberto Delgado

12h 35m1 stop Montreal Pierre Elliott Trudeau Intl

5:00 am - 3:35 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

17h 35m1 stop Frankfurt am Main

$723United Airlines

Wed, Nov 25 - Thu, Dec 3

11:20 am - 6:55 amDEN Denver Intl-LIS Lisbon Humberto Delgado

12h 35m1 stop Montreal Pierre Elliott Trudeau Intl

11:20 am - 6:10 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

37h 50m2 stops Montreal Pierre Elliott Trudeau Intl Chicago O'Hare Intl

$725Air Canada

Wed, Nov 25 - Fri, Dec 4

Cheap last minute flights

Enter your travel dates to find the best prices.

9:40 am - 7:00 amDEN Denver Intl-OPO Porto

14h 20m1 stop Montreal Pierre Elliott Trudeau Intl

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

16h 40m1 stop Frankfurt am Main

$1,021Multiple Airlines

Fri, Aug 21 - Thu, Aug 27

9:40 am - 7:00 amDEN Denver Intl-OPO Porto

14h 20m1 stop Montreal Pierre Elliott Trudeau Intl

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

16h 40m1 stop Frankfurt am Main

$1,021Multiple Airlines

Fri, Aug 21 - Fri, Aug 28

9:40 am - 7:00 amDEN Denver Intl-OPO Porto

14h 20m1 stop Montreal Pierre Elliott Trudeau Intl

6:00 am - 1:30 pmOPO Porto-DEN Denver Intl

14h 30m1 stop Frankfurt am Main

$1,025United Airlines

Fri, Aug 21 - Tue, Aug 25

9:40 am - 7:00 amDEN Denver Intl-OPO Porto

14h 20m1 stop Montreal Pierre Elliott Trudeau Intl

11:20 am - 6:55 pmOPO Porto-DEN Denver Intl

14h 35m1 stop Montreal Pierre Elliott Trudeau Intl

$1,096United Airlines

Fri, Aug 21 - Sat, Aug 29

6:40 pm - 10:05 amDEN Denver Intl-LIS Lisbon Humberto Delgado

32h 25m1 stop London Heathrow

11:05 am - 10:43 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

18h 38m1 stop Philadelphia

$1,127British Airways

Fri, Aug 21 - Fri, Aug 28

6:40 pm - 11:10 pmDEN Denver Intl-LIS Lisbon Humberto Delgado

21h 30m1 stop London Heathrow

11:05 am - 10:43 pmLIS Lisbon Humberto Delgado-DEN Denver Intl

18h 38m1 stop Philadelphia

$1,127British Airways

Fri, Aug 21 - Wed, Aug 26

4:15 pm - 11:25 pmDEN Denver Intl-OPO Porto

24h 10m1 stop Munich Franz Josef Strauss

6:20 am - 1:45 pmOPO Porto-DEN Denver Intl

14h 25m1 stop Munich Franz Josef Strauss

$1,155Lufthansa

Mon, Aug 24 - Mon, Sep 7

1:15 pm - 7:30 pmDEN Denver Intl-FAO Faro

23h 15m2 stops Atlanta Hartsfield-Jackson Amsterdam Schiphol

8:20 pm - 3:24 pmFAO Faro-DEN Denver Intl

26h 04m2 stops Amsterdam Schiphol Minneapolis St Paul

$1,186KLM

Wed, Aug 26 - Wed, Sep 9

1:15 pm - 7:30 pmDEN Denver Intl-FAO Faro

23h 15m2 stops Atlanta Hartsfield-Jackson Amsterdam Schiphol

8:20 pm - 3:24 pmFAO Faro-DEN Denver Intl

26h 04m2 stops Amsterdam Schiphol Minneapolis St Paul

$1,187KLM

Wed, Aug 26 - Wed, Sep 9

4:15 pm - 11:25 pmDEN Denver Intl-OPO Porto

24h 10m1 stop Munich Franz Josef Strauss

6:20 am - 1:45 pmOPO Porto-DEN Denver Intl

14h 25m1 stop Munich Franz Josef Strauss

$1,256Lufthansa

Sat, Aug 22 - Sat, Aug 29

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Icelandair flights from Denver to Portugal

Our best Icelandair deals on Denver to Portugal flight tickets

Icelandair

Nov 2

DEN3:40 pmDenver Intl

14h 10m

1 stop

LIS12:50 pmLisbon Humberto Delgado

Nov 24

LIS2:00 pmLisbon Humberto Delgado

35h 00m

1 stop

DEN6:00 pmDenver Intl

$680

Icelandair

Oct 31

DEN4:40 pmDenver Intl

14h 10m

1 stop

LIS12:50 pmLisbon Humberto Delgado

Nov 10

LIS2:00 pmLisbon Humberto Delgado

35h 00m

1 stop

DEN6:00 pmDenver Intl

$681

Icelandair

Nov 2

DEN3:40 pmDenver Intl

14h 10m

1 stop

LIS12:50 pmLisbon Humberto Delgado

Nov 10

LIS2:00 pmLisbon Humberto Delgado

35h 00m

1 stop

DEN6:00 pmDenver Intl

$689

Aer Lingus flights from Denver to Portugal

Our best Aer Lingus deals on Denver to Portugal flight tickets

Aer Lingus

Aug 26

DEN8:00 pmDenver Intl

16h 05m

1 stop

FAO7:05 pmFaro

Sep 9

FAO11:45 amFaro

19h 32m

2 stops

DEN12:17 amDenver Intl

$1,139

Aer Lingus

Sep 2

DEN9:05 amDenver Intl

18h 40m

2 stops

LIS10:45 amLisbon Humberto Delgado

Sep 10

LIS11:25 amLisbon Humberto Delgado

28h 12m

2 stops

DEN8:37 amDenver Intl

$1,141

Aer Lingus

Sep 2

DEN6:56 amDenver Intl

20h 49m

2 stops

LIS10:45 amLisbon Humberto Delgado

Sep 16

LIS10:15 pmLisbon Humberto Delgado

33h 02m

2 stops

DEN12:17 amDenver Intl

$1,143

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DenverLisbon

DEN Denver Intl - LIS Lisbon Humberto Delgado

DENLIS

Denver Intl

Mon 11/2

3:40 pm-12:50 pm

1 stop14h 10m

Lisbon Humberto Delgado

Tue 11/24

2:00 pm-6:00 pm

1 stop35h 00m

$680

DenverLisbon

DEN Denver Intl - LIS Lisbon Humberto Delgado

DENLIS

Denver Intl

Sat 10/31

4:40 pm-12:50 pm

1 stop14h 10m

Lisbon Humberto Delgado

Tue 11/10

2:00 pm-6:00 pm

1 stop35h 00m

$681

DenverLisbon

DEN Denver Intl - LIS Lisbon Humberto Delgado

DENLIS

Denver Intl

Tue 11/10

4:15 pm-1:30 pm

1 stop14h 15m

Lisbon Humberto Delgado

Tue 11/24

5:00 am-3:35 pm

1 stop17h 35m

$705

DenverLisbon

DEN Denver Intl - LIS Lisbon Humberto Delgado

DENLIS

Denver Intl

Mon 10/12

6:05 pm-11:05 am

1 stop34h 00m

Lisbon Humberto Delgado

Wed 11/11

5:00 am-3:35 pm

1 stop17h 35m

$706

DenverLisbon

DEN Denver Intl - LIS Lisbon Humberto Delgado

DENLIS

Denver Intl

Wed 10/28

11:20 am-6:55 am

1 stop13h 35m

Lisbon Humberto Delgado

Fri 11/6

5:00 am-3:35 pm

1 stop17h 35m

$707

DenverLisbon

DEN Denver Intl - LIS Lisbon Humberto Delgado

DENLIS

Denver Intl

Mon 11/2

4:15 pm-1:30 pm

1 stop14h 15m

Lisbon Humberto Delgado

Wed 11/25

5:00 am-3:35 pm

1 stop17h 35m

$708

Quickest round-trip

DenverLisbon

DEN Denver Intl - LIS Lisbon Humberto Delgado

DENLIS

Denver Intl

Wed 11/18

11:20 am-6:55 am

1 stop12h 35m

Lisbon Humberto Delgado

Fri 11/27

11:20 am-8:27 pm

1 stop16h 07m

$712

DenverLisbon

DEN Denver Intl - LIS Lisbon Humberto Delgado

DENLIS

Denver Intl

Wed 10/28

11:20 am-6:55 am

1 stop13h 35m

Lisbon Humberto Delgado

Fri 11/6

5:00 am-1:40 pm

1 stop15h 40m

$723

DenverLisbon

DEN Denver Intl - LIS Lisbon Humberto Delgado

DENLIS

Denver Intl

Wed 11/25

11:20 am-6:55 am

1 stop12h 35m

Lisbon Humberto Delgado

Thu 12/3

5:00 am-3:35 pm

1 stop17h 35m

$723

DenverLisbon

DEN Denver Intl - LIS Lisbon Humberto Delgado

DENLIS

Denver Intl

Wed 11/25

11:20 am-6:55 am

1 stop12h 35m

Lisbon Humberto Delgado

Fri 12/4

11:20 am-6:10 pm

2 stops37h 50m

$725

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 $637, 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 $734.

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 $942 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 $825 on momondo.

Can stopping save me money on Denver to Portugal flights?

You could potentially save up to 9% 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	$327
Fastest flight time	11h 05m
Direct flights	None

The best one-way flight to Portugal from Denver in the past 72 hours is $327. The best round-trip flight deal from Denver to Portugal found on momondo in the last 72 hours is $680.

The fastest flight from Denver to Portugal takes 11h 05m

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 11 operators available for flights from Denver Intl Airport to Portugal as of August 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 6.9 731 reviews	Search Icelandair flights
KLM	PriceFrom $551	Free Cancellation	Rating 7.8 1,560 reviews	Search KLM flights
Lufthansa	PriceFrom $559	Free Cancellation	Rating 6.8 8,202 reviews	Search Lufthansa flights
Air France	PriceFrom $575	Free Cancellation	Rating 7.5 1,647 reviews	Search Air France flights
Delta	PriceFrom $575	Free Cancellation	Rating 7.8 8,508 reviews	Search Delta flights
United Airlines	PriceFrom $575	Free Cancellation	Rating 7.4 10,102 reviews	Search United Airlines flights
American Airlines	PriceFrom $575	Free Cancellation	Rating 7.1 11,977 reviews	Search American Airlines flights
Virgin Atlantic	PriceFrom $592	Free Cancellation	Rating 7.4 695 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom $632	Free Cancellation	Rating 6.7 8,179 reviews	Search British Airways flights
Turkish Airlines	PriceFrom $635	Free Cancellation	Rating 7.4 4,480 reviews	Search Turkish Airlines 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 $554

Flights to Portofrom $523

Flights to Funchalfrom $597

Flights to Farofrom $610

Flights to Ponta Delgadafrom $568

Flights to Lajesfrom $618

Flights to Hortafrom $696

Flights to Pico Islandfrom $668

Flights to Porto Santofrom $713

Flights to Velasfrom $729

Cheap flights from Denver to Portugal from $327

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 10/23. 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

Filter for what you want

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Icelandair flights from Denver to Portugal

Our best Icelandair deals on Denver to Portugal flight tickets

Aer Lingus flights from Denver to Portugal

Our best Aer Lingus 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