$401 Find Cheap Flights from Portugal to Denver

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Denver departing on 10/7. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Denver

 
These are the airlines KAYAK users have selected most often from within our search results for flights to Denver, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results for flights to Denver, as well as popular online travel agencies
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Cheap Flights from Portugal to Denver

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Portugal to Denver that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Portugal to Denver

Fri, Sep 5 - Fri, Sep 19
Aer Lingus Logo
10:15 pm - 5:59 pmLIS-DEN
26h 44m1 stop
Aer Lingus Logo
7:55 pm - 9:35 pmDEN-LIS
18h 40m1 stop
$580Aer Lingus
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Fri, Sep 12 - Fri, Sep 19
 Logo
9:25 am - 5:59 pmLIS-DEN
15h 34m1 stop
 Logo
7:55 pm - 5:00 pmDEN-LIS
14h 05m1 stop
Sat, Sep 13 - Sat, Sep 20
KLM Logo
8:55 am - 7:54 pmLIS-DEN
17h 59m2 stops
KLM Logo
11:20 am - 10:45 amDEN-LIS
16h 25m1 stop
$774KLM
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Wed, Aug 27 - Fri, Sep 5
Delta Logo
5:00 am - 3:28 pmLIS-DEN
17h 28m2 stops
Delta Logo
12:11 pm - 2:50 pmDEN-LIS
19h 39m2 stops
$776Delta
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Tue, Aug 26 - Thu, Sep 4
Delta Logo
5:40 am - 3:30 pmLIS-DEN
16h 50m1 stop
Delta Logo
12:11 pm - 2:50 pmDEN-LIS
19h 39m2 stops
$777Delta
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Fri, Sep 5 - Fri, Sep 19
British Airways Logo
11:05 am - 9:50 pmLIS-DEN
17h 45m1 stop
British Airways Logo
6:35 pm - 11:10 pmDEN-LIS
21h 35m1 stop
$835British Airways
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Mon, Aug 25 - Sun, Sep 7
British Airways Logo
11:05 am - 9:55 pmLIS-DEN
17h 50m1 stop
British Airways Logo
2:17 pm - 11:05 pmDEN-LIS
25h 48m2 stops
$837British Airways
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Wed, Oct 1 - Thu, Oct 16
KLM Logo
5:00 am - 3:44 pmLIS-DEN
17h 44m2 stops
KLM Logo
12:42 pm - 8:00 amDEN-LIS
12h 18m1 stop
$843KLM
Find Deal
Thu, Aug 28 - Sun, Sep 7
United Airlines Logo
5:05 am - 3:35 pmLIS-DEN
17h 30m1 stop
United Airlines Logo
9:40 am - 9:20 amDEN-LIS
16h 40m1 stop
$863United Airlines
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Mon, Aug 25 - Sat, Sep 6
United Airlines Logo
7:30 am - 3:35 pmLIS-DEN
15h 05m1 stop
United Airlines Logo
8:20 pm - 9:50 pmDEN-LIS
18h 30m1 stop
$868United Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for flights to Denver

Get data-powered insights and trends for flights to Denver to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly to Denver?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights to Denver, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights to Denver is October, where tickets cost $779 on average for return flights. On the other hand, the most expensive months are July and June, where the average cost of tickets from Portugal is $1,121 and $1,063 respectively. For one-way flights, the best month to travel is October with an average price of $779.


Good to know

Low seasonJune
Cheapest flight$401
Best time to beat the crowds but there is an average 3% increase in price.
Most popular time to fly with an average 11% increase in price.
Flight from Lisbon to Denver

FAQs - booking Denver flights

  • How far is Denver Intl Airport from central Denver?

    Central Denver is 18 miles away from Denver Intl Airport.

  • What is the name of Denver’s airport?

    All flights to Denver land at Denver Intl Airport. The airport code is DEN,and it can also be referred to as Denver or Denver Intl.

  • What is the cheapest day to fly to Denver?

    Based on KAYAK data, the cheapest day to fly to Denver is Wednesday where round-trip tickets can be as cheap as $803. On the other hand, the most expensive day to fly is Friday, where round-trip prices are $1,169 on average.

  • How does KAYAK find such low prices on flights to Denver?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights to Denver.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket to Denver?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights to Denver?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Denver with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight to Denver?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Denver?

    The cheapest time of day to fly to Denver is generally in the morning, when round-trip flights cost $951 on average. The most expensive time of day to fly to Denver is generally in the morning, which is peak travel time and where the average cost of a ticket is $951.

  • How many direct flights to Denver are there each week?

    Each week there are around 8,136 direct flights from within Portugal to Denver. The most common day for departures is Sunday, with 16% of flights taking off on this day.

Top tips for finding cheap flights to Denver

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Denver flight deals.

Reviews of the top 3 airlines serving from Portugal to Denver

 
See real verified KAYAK customer reviews for airlines flying to Denver. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Portugal to Denver. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with to Denver? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 7980 reviews
8.5Crew
7.3Food
8.2Boarding
7.9Comfort
7.9Entertainment
Airline reviews

Check in process was terrible. Lady at counter didn’t know what she was doing

4.0 OkayAnonymous, Jul 2025ICN - SEA
Read more Delta reviews

Check in process was terrible. Lady at counter didn’t know what she was doing

Delayed and took off even later than the scheduled delay time

For a 69 year old with health problems I had the worse experience, no wheelchair when I entered a lady told me to sit and wait while a gentleman told me I had to walk to the Delta station, which I did. I had a carry on and a bag, and I was traveling with my service dog, which was on his carrier and the lady charged me for my carry on luggage, beside all the waiting cause of the delay, I had to walk to get my luggage cause no wheelchair showed up, I am so disappointed. I will get in touch with the company. I got home at 3:00 am, not good for my health situation.

Great experience on Delta. Staff from baggage check to flight attendants were very courteous and professional. My only issue was a personal preference for pretzels instead of the chips and cookies that were offered.

The crew was amazing; Von, Vera and Guadalupe were very friendly and attentive throughout the entire flight. They were friendly and welcoming to everyone. A solid and dedicated team for sure!

Terrible. I was bumped off of my original flight and spent the next six days fighting to get back on it. I lost hours of my vacation trying to get this situation corrected.

There was no problems, just a little uncomfortable with seats that do not lay back a little

Always good but we must do something about people in rows ahead of you that don't put their seats back up when they are suppose to. And It's rough to not be able to even lean over to get something out of my purse.

Flight was delayed, 30+ bags had to be gate checked. Crew were very friendly!

Everything was good until we were boarding our connection flight in Atlanta, we were told to gate check our carry-on, but when we got inside the plane, there was plenty of room in the overhead.

Our flight was understandably diverted to a small regional airport in Laramie, Wyoming due to weather conditions, which I fully recognize and appreciate. However, the low rating stems from the experience that followed: passengers remained on board for over an hour without the option to deplane and stretch, despite the aircraft being stationary. Although the pilot opened the cabin door, only he was permitted to exit. Meanwhile, passengers grew increasingly uncomfortable as warm summer air entered the cabin through the open door, and being in the second row meant we were impacted immediately. While the flight attendants made efforts to keep everyone at ease, I believe allowing passengers to deplane briefly, given the extended delay, would have significantly improved the overall experience.

I never flew. Flight was canceled. DIA worst airport in the country. Avoid at all costs.

Very rough getting into denver. my kid threw up it was so rough.

Why wasn't this flight departure scheduled eith another crew so that it could leave on time? When we arrived in Denver we had so little time between flights we had run to the connecting flight. We should received some credit for the inconvenience.

Efficient, calm when things were delayed and kept us regularly informed of what was happening.

I was supposed to be on business class at first class from Denver back to Miami due to weather changes. I missed my connection and it’s put on a flight to Fort Lauderdale. Instead of honoring my business class/1st class ticket, they put me in coach, but there were two first class seats open. I think it’s absolutely disgusting that I paid for first class $1300 ticket and they put me in economy and they had to open seats available and I have still not been refunded the difference. I ended up having to eat a snack box instead of the meal I was supposed to get and did not get home till 2 AM so I think that’s a little pathetic that I had to live off crackers for dinner And my poor dog ate some cheese and salami. Oh yes, apparently when they switched me to the new flight they forgot to mention I had a service dog

Excellent service despite turbulence during the flight. Flight attendants were remarkable!

Flight attendant moved my bag without notifying me and was rude to me when I asked him about it. There was no reason to move it.

Plane temperature was comfortable (not to hot) when boarding and waiting for takeoff.

Food choices were very limited. Taste of the dishes was average.

Excellent everywhere but Philly, the most rotten airport in the world.

Check in was not the greatest as had to talk to an agent to clarify things and then he transferred us to another agent who had difficulty processing my credit card as there was a system glitch and not a card error.

I was put into business class. Wow! My flight attendant was great! The food amazing’

The gate at London Gatwick had confusing signs for the different zones and the staff seemed harried because people didn't know when it was their turn to come to the desk. Plus, with there were too many carry-on bag travelers, myself included. The charge scheme for checking bags is frustrating. If you travel light, you want the freedom to leave as soon as you deplane. When you are forced to gate-check your bag simply because the flight is fully booked, you lose whatever time you'd hoped to save because you're still stuck waiting for your bag to come off the conveyor belt.

Safe arrival. Improvement on Time efficiency Effective Communication will be great.

Not so good with their baggage handling as they damaged one of my check in luggage

A good flight back to Tampa and thankfully although we had a 90 minute delay because of thunder storms from Charlotte to bottom iof Florida, it was a prudent to avoid these for a comfortable flight as opposed to being tossed around with turbulence.

All went well on the flight, not happy of course with having to pay for a seat and in hold luggage of £50

They removed our booking without telling us. Cost us thousands to book last minute

The decided to just remove our booking without telling us. It ended up costing us thousands

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