HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portugal

$270+ Cheap flights from Denver (DEN) to Portugal

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 2/1. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — LIS
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Denver to Portugal with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Denver to Portugal

Cheapest flights from Denver to Portugal
Explore the most affordable flight options available from Denver to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

This FlightHub deal was found by Cheapflights users on 12/13. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/304:20 pmDEN - LIS
1 stop20h 35mLufthansa
Tue 1/132:10 pmLIS - DEN
1 stop31h 25mLufthansa
Deal found 12/13$563
This KAYAK deal was found by Cheapflights users on 12/14. 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 12/294:20 pmDEN - LIS
1 stop24h 10mLufthansa
Tue 1/132:10 pmLIS - DEN
1 stop31h 25mLufthansa
Deal found 12/14$567
This KLM deal was found by Cheapflights users on 12/13. 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 12/3011:59 pmDEN - LIS
1 stop25h 41mKLM
Tue 1/135:00 amLIS - DEN
2 stops19h 34mKLM
Deal found 12/13$573
This Finnair deal was found by Cheapflights users on 12/13. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/297:00 amDEN - LIS
1 stop19h 05mMultiple Airlines
Tue 1/1311:05 amLIS - DEN
1 stop18h 19mMultiple Airlines
Deal found 12/13$575
This United Airlines deal was found by Cheapflights users on 12/15. 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 12/298:20 pmDEN - LIS
1 stop20h 10mUnited Airlines
Tue 1/1310:15 amLIS - DEN
1 stop16h 10mUnited Airlines
Deal found 12/15$577
This American Airlines deal was found by Cheapflights users on 12/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:07 amDEN - LIS
2 stops17h 58mAmerican Airlines
Tue 1/1311:05 amLIS - DEN
2 stops17h 11mAmerican Airlines
Deal found 12/13$580
This United Airlines deal was found by Cheapflights users on 12/14. 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 12/1512:50 pmDEN - LIS
2 stops14h 25mUnited Airlines
Wed 12/245:00 amLIS - DEN
1 stop18h 00mUnited Airlines
Deal found 12/14$601
This oojo deal was found by Cheapflights users on 12/15. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/1611:28 pmDEN - PDL
1 stop25h 27mMultiple Airlines
Wed 1/145:50 pmPDL - DEN
2 stops22h 52mMultiple Airlines
Deal found 12/15$1,280
This Ovago deal was found by Cheapflights users on 12/12. 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.
Fri 12/268:20 pmDEN - OPO
2 stops19h 05mLufthansa
Tue 12/304:15 pmOPO - DEN
2 stops29h 20mLufthansa
Deal found 12/12$1,312
This oojo deal was found by Cheapflights users on 12/14. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/1511:59 pmDEN - PDL
2 stops48h 56mMultiple Airlines
Mon 12/225:50 pmPDL - DEN
2 stops35h 09mMultiple Airlines
Deal found 12/14$1,537
This Mytrip deal was found by Cheapflights users on 12/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/153:40 pmDEN - OPO
2 stops20h 35mMultiple Airlines
Sat 12/208:50 amOPO - DEN
1 stop14h 50mMultiple Airlines
Deal found 12/13$1,635
This CheapOair deal was found by Cheapflights users on 12/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/266:44 amDEN - FAO
2 stops44h 46mMultiple Airlines
Wed 12/312:10 pmFAO - DEN
2 stops51h 13mMultiple Airlines
Deal found 12/15$1,748

Find flight deals from Denver to Portugal

Keep the following information in mind while searching for Denver to Portugal flight deals. Data was last updated December 15, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

Gurufare
3 stars

Round-trip from

$488
(Mytrip)

One-way from

$270
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$1,337
Provider with most accurate pricing for Denver Intl-Lisbon Humberto Delgado flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Lisbon Humberto Delgado flights.
Search Deals
From Denver Intl to Portugal
Search Deals
One-way flight from Denver Intl to Portugal
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($174 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($39 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 Denver to Portugal 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 15, 2025.
Use the filters below to find and compare flights from Denver to Portugal that are best for you.

Fly from

Denver

Fly to

Portugal

Route

Depart

Return

Price

DenverLisbon

DEN - LIS

DENLIS

Denver Intl

Mon 1/12

12:49 pm-8:10 am

1 stop12h 21m

Lisbon Humberto Delgado

Tue 1/27

5:00 am-1:40 pm

1 stop15h 40m

$550

DenverLisbon

DEN - LIS

DENLIS

Denver Intl

Sun 1/11

1:31 pm-8:10 am

1 stop11h 39m

Lisbon Humberto Delgado

Tue 1/27

5:00 am-1:40 pm

1 stop15h 40m

$550

DenverLisbon

DEN - LIS

DENLIS

Denver Intl

Wed 1/14

7:50 am-9:20 am

2 stops18h 30m

Lisbon Humberto Delgado

Tue 1/20

6:10 am-2:35 pm

1 stop15h 25m

$557

DenverLisbon

DEN - LIS

DENLIS

Denver Intl

Tue 1/27

4:20 pm-1:20 pm

1 stop14h 00m

Lisbon Humberto Delgado

Tue 3/31

5:05 am-3:56 pm

2 stops17h 51m

$557

DenverLisbon

DEN - LIS

DENLIS

Denver Intl

Wed 1/14

1:25 pm-9:20 am

1 stop12h 55m

Lisbon Humberto Delgado

Tue 1/20

11:20 am-10:35 am

2 stops30h 15m

$558

DenverLisbon

DEN - LIS

DENLIS

Denver Intl

Mon 3/2

6:00 am-9:00 am

2 stops20h 00m

Lisbon Humberto Delgado

Wed 3/11

5:00 am-8:14 pm

2 stops21h 14m

$570

DenverLisbon

DEN - LIS

DENLIS

Denver Intl

Wed 1/14

11:38 am-3:10 pm

2 stops20h 32m

Lisbon Humberto Delgado

Tue 1/20

5:00 am-9:14 pm

2 stops23h 14m

$570

DenverLisbon

DEN - LIS

DENLIS

Denver Intl

Mon 12/29

8:20 pm-11:30 pm

1 stop20h 10m

Lisbon Humberto Delgado

Tue 1/13

10:15 am-7:25 pm

1 stop16h 10m

$577

DenverLisbon

DEN - LIS

DENLIS

Denver Intl

Sun 1/11

9:59 am-8:10 am

1 stop15h 11m

Lisbon Humberto Delgado

Sun 1/18

10:15 am-5:58 pm

1 stop14h 43m

$587

DenverLisbon

DEN - LIS

DENLIS

Denver Intl

Sun 2/8

12:49 pm-8:10 am

1 stop12h 21m

Lisbon Humberto Delgado

Sun 2/15

5:00 am-4:00 pm

1 stop18h 00m

$603

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/12

Showing 1-10 of 49 results
1
2
3
...
5

Best time to book a flight from Denver to Portugal

Have a flexible travel schedule? Discover the best time to fly to Portugal from Denver 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 Denver to Portugal

What is the cheapest month to book a flight from Denver to Portugal?

Currently, November is the cheapest month in which you can book a flight from Denver to Portugal (average of $505). Flying from Denver to Portugal in June is currently the most expensive (average of $1,005). 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 DEN to PT?

Find hourly flight availability from Denver to Portugal. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 15, 2025.

It’s typically best to fly out from Denver to Portugal in the evening. Doing so could potentially save you 27% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from Denver to Portugal?

Use this chart to determine the cheapest time to fly round-trip from Denver to Portugal. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Denver to Portugal flight should consider departing on Thursday evenings when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Portugal

Get insights into the airlines that provide service to Portugal. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Portugal. Reviews last updated December 15, 2025.
See what other customers who have flown with United Airlines, Turkish Airlines, and Air Canada from Denver to Portugal have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,092 reviews

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
United Airlines
7.4
Good
9,092 reviews
United Airlines
7.4
Good
9,092 reviews

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
Turkish Airlines
7.3
Good
4,098 reviews
United Airlines
7.4
Good
9,092 reviews

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
Air Canada
7.1
Good
10,526 reviews
United Airlines
7.4
Good
9,092 reviews

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
Lufthansa
6.8
Okay
7,628 reviews
United Airlines
7.4
Good
9,092 reviews

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
British Airways
6.7
Okay
7,575 reviews
United Airlines
7.4
Good
9,092 reviews

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.

Related info for your journey

Find useful and relevant information for your journey from Denver to Portugal. 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 from for flights from Denver to Portugal?

    Most people fly from Denver Intl (DEN) if they book a flight from Denver to Portugal. Denver Intl is conveniently located just 18.5 mi from Denver’s city center.

  • How long is the flight from Denver to Portugal?

    For as low as $550, United Airlines can have you in Portugal from Denver in 12h 21m. The distance between Denver and Portugal is about 4826 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Denver to Portugal one-way?

    The cheapest airlines for a one-way flight from Denver to Portugal are Icelandair ($251), British Airways ($326), and Air France ($408).

  • What are the most popular routes from Denver to Portugal?

    Most travelers choose Denver Intl - Lisbon Humberto Delgado, Denver Intl - Porto or Denver Intl - Faro when deciding on the best route from Denver to Portugal.

  • Can I find deals for flights from Denver to Portugal that include hotel bookings?

    Yes. In addition to deals on Denver to Portugal flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Denver to Portugal?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Denver to Portugal.

  • Can I find deals for business class flights from Denver to Portugal?

    Yes. Cheapflights offers flight deals from Denver to Portugal 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 Denver to Portugal?

    Currently, November is the cheapest month in which you can book a flight from Denver to Portugal (average of $505). Flying from Denver to Portugal in June is currently the most expensive (average of $1,005). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Denver to Portugal

See prices for flight routes from nearby airports that may be better suited for you.
Denver to Heathrow flights
Denver to Dublin flights
Denver to Leonardo da Vinci/Fiumicino flights
Denver to Charles de Gaulle flights
Denver to Frankfurt flights
Denver to Gatwick flights
Denver to Orly flights
Denver to Athens flights
Denver to Barcelona-El Prat flights
Denver to Istanbul flights
Denver to Munich flights
Denver to London City flights
Denver to Madrid flights
Denver to Lisbon flights
Denver to Amsterdam flights
Denver to Vicenza flights
Denver to Malpensa flights
Denver to Keflavik Intl flights
Denver to Linate flights
Denver to Stansted flights
Denver to Sabiha Gokcen flights
Denver to Zurich flights
Denver to Edinburgh flights
Denver to Oslo Gardermoen flights
Denver to Florence flights
Denver to Naples flights
Denver to Geneva flights
Denver to Bruxelles-National flights
Denver to Glasgow Intl flights
Denver to Berlin flights
Denver to Copenhagen flights
Denver to Luton flights
Denver to Manchester flights
Denver to Porto flights
Denver to Arlanda flights
Denver to Budapest flights
Denver to Prague flights
Denver to Catania flights
Denver to Duesseldorf Intl flights
Denver to Shannon flights
Denver to Helsinki flights
Denver to Vienna flights
Denver to Otopeni Intl flights
Denver to Bologna flights
Denver to Split flights
Denver to Dubrovnik flights
Denver to Frederic Chopin flights

Top 10 airlines flying from Denver to Portugal

Discover the top 10 airlines that operate flights from Denver to Portugal. 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 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$458Average$668FlexibilityNo cancel feeOn-time76%
Virgin AtlanticCheapest$539Average$984FlexibilityNo cancel feeOn-time72%
DeltaCheapest$551Average$939FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$555Average$887FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$565Average$1,075FlexibilityNo cancel feeOn-time76%
Air FranceCheapest$569Average$876FlexibilityNo cancel feeOn-time77%
Turkish AirlinesCheapest$574Average$689FlexibilityNo cancel feeOn-time77%
KLMCheapest$575Average$768FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$594Average$1,338FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$596Average$906FlexibilityNo cancel feeOn-time67%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.