DEN - OPO

$287 Find Cheap Flights from Denver to Porto

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to Porto departing on 10/16. 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 Porto

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Porto, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Porto, as well as popular online travel agencies
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Flights Deals

Cheap Flights from Denver to Porto (DEN-OPO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Denver to Porto 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 Denver to Porto

Tue, Sep 30 - Wed, Oct 15
 Logo
9:40 am - 5:45 pmDEN-OPO
25h 05m2 stops
 Logo
10:00 pm - 3:35 pmOPO-DEN
24h 35m2 stops
Wed, Nov 5 - Wed, Nov 12
United Airlines Logo
1:45 pm - 9:30 amDEN-OPO
12h 45m1 stop
United Airlines Logo
6:00 am - 4:00 pmOPO-DEN
17h 00m1 stop
$580United Airlines
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Wed, Nov 5 - Wed, Nov 12
United Airlines Logo
9:35 am - 9:30 amDEN-OPO
16h 55m2 stops
United Airlines Logo
6:00 am - 4:00 pmOPO-DEN
17h 00m1 stop
$584United Airlines
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Tue, Sep 30 - Wed, Oct 15
 Logo
9:40 am - 5:45 pmDEN-OPO
25h 05m2 stops
 Logo
10:00 pm - 4:24 pmOPO-DEN
25h 24m3 stops
Tue, Sep 23 - Tue, Sep 30
 Logo
9:40 am - 5:45 pmDEN-OPO
25h 05m2 stops
 Logo
10:00 pm - 1:45 pmOPO-DEN
22h 45m2 stops
Sun, Nov 9 - Tue, Nov 18
Iberia Logo
12:21 pm - 11:45 amDEN-OPO
16h 24m2 stops
Iberia Logo
8:20 am - 10:19 pmOPO-DEN
20h 59m2 stops
$608Iberia
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Tue, Oct 14 - Mon, Nov 3
Lufthansa Logo
5:59 pm - 3:45 pmDEN-OPO
14h 46m1 stop
Lufthansa Logo
12:30 pm - 4:00 pmOPO-DEN
34h 30m1 stop
$621Lufthansa
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Sat, Nov 8 - Mon, Nov 17
Scandinavian Airlines Logo
12:43 pm - 4:45 pmDEN-OPO
45h 02m2 stops
Scandinavian Airlines Logo
5:35 pm - 10:46 pmOPO-DEN
36h 11m2 stops
$644Scandinavian Airlines
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Tue, Dec 2 - Sun, Dec 14
Lufthansa Logo
4:20 pm - 12:50 pmDEN-OPO
13h 30m1 stop
Lufthansa Logo
6:00 am - 4:00 pmOPO-DEN
17h 00m1 stop
$647Lufthansa
Find Deal
Thu, Sep 25 - Thu, Oct 16
Turkish Airlines Logo
7:50 pm - 3:50 pmDEN-OPO
37h 00m1 stop
Turkish Airlines Logo
4:50 pm - 5:55 pmOPO-DEN
32h 05m1 stop
$762Turkish Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for Denver to Porto flights

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

What’s the cheapest day of the week to fly from Denver to Porto?

The average price of all round-trip flights from Denver to Porto clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Denver to Porto, look for departures on Mondays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from Porto, Friday is the cheapest day to fly and Monday is the most expensive.

What is the cheapest month to fly from Denver to Porto?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Denver to Porto, 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 from Denver to Porto is January, where tickets cost $718 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is $1,490 and $1,191 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Denver to Porto, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Denver to Porto, you should book around 3 weeks before departure, which saves you about 43% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 25 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$287
Best time to beat the crowds with an average 21% drop in price.
Most popular time to fly with an average 16% increase in price.
Flight from Denver to Porto

When to book flights from Denver to Porto

Are your dates flexible? Find out the best times to travel from Denver to Porto based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Denver to Porto

  • What is the cheapest flight from Denver to Porto?

    In the last 3 days, the lowest price for a flight from Denver to Porto was $287 for a one-way ticket and $579 for a round-trip.

  • Do I need a passport to fly between Denver and Porto?

    Yes, you’ll need a passport to travel to Porto from Denver.

  • Which airports will I be using when flying from Denver to Porto?

    When flying out of Denver you will be using Denver Intl. You will be landing at Porto, also known as Porto.

  • Which aircraft models fly most regularly from Denver to Porto?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Denver to Porto?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between Denver and Porto, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Denver to Porto, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Denver to Porto are Delta and United Airlines. With an average price for the route of $1,265 and an overall rating of 8.0, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $1,058 and an overall rating of 7.4.

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

    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 from Denver to Porto.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto from 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 from Denver to Porto?

    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 Porto with an airline and back to Denver with another airline. Booking your flights between Denver and OPO can sometimes prove cheaper using this method.

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

    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 Porto from Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 4 airlines serving from Denver to Porto

 
See real verified KAYAK customer reviews for airlines flying from Denver to Porto. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Denver to Porto? 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
7.9Comfort
8.2Boarding
7.3Food
8.5Crew
7.9Entertainment
Airline reviews

Delayed and took off even later than the scheduled delay time

8.0 ExcellentAnonymous, Jul 2025DTW - SEA
Read more Delta reviews

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.

Only issue was with seating. The economy fare we purchased did say there was no guarantee the three people in our party would be seated together, and we were not. At the gate, the agent told us more specifically, the fare we purchased meant we would be seated in middle seats only. This should just be made more obvious.

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.

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.

Did not know my son and I had different seating arrangements. He was fine, but it was disappointing.

Flight was canceled, and no effort was made to help with rebooking, no hotel vouchers, no car transportation and minimal food voucher and most places for food were closed by the time the voucher was given. Waited for 3 hours for bags. Simply the worst travel experience I have ever had

Impressed with the service despite turbulence because of the weather. Both flights arrived before their scheduled times.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

The seat and leg room was not good. The food and beverage service was good.

For economy, it was very good. Staff was great, they even let some of us change seats for more leg room... Put an empty seat between us which was fantastic for a 12hr flight. Onboard entertainment was excellent, I think over 200 choices of movies/tv/etc The bad was the barely/nonfunctional wifi that cost either $16.99 or 1700 miles (full flight). It was atrocious... Definitely the worst of the last 3 long haul major airlines I was on the last few months.

Electric plugs didn't work. Entertainment system wasn't working

The design of the light switch on the arm rest is ridiculous.

The gate attendant let me walk right by her with a bag too big for the overhead compartment

Overall, it was a good experience. Boarding was good and there was plenty of overhead bin space for everyone’s carryons (even when we boarded toward the end). Only improvement would be to offer trash service more regularly.

David went above and beyond to make our flight the best that it could be

No food service almost missed because of first flight delays

The economy seat was so uncomfortable, had not enough leg room for 13 hours flight, front seat basket was broken and couldn’t hold anything, food quality was horrible( we got food poisoned ) we charged for logged which used to be free. We paid too much for this flight and very disappointed. Turkish air line better to make satisfy and respect people instead of find different way to scam people.

This is really the rating of two flights. JFK to IST then IST to NQZ. New York to Istanbul was good. Good crew and all positives. The flight to Astana was so bad that brought it all down. Crew was nonexistent above the minimum, seats were cramped, and it was hot on the plane. Turkish Airlines seems to be slipping down to US based carriers level.

The 2 agents on the check in counter were super nice , helpful and very polite. Boarding was like a 1 2 3, I would recommend Turkish airlines for your next trip.

Everything was very good, except that the plane was an hour and a half late

flight with heavy turbulence old boeing 777 rest wasnt clean dashboard doesn’t work

Light and recline did not work on my seat. Very uncomfortable and could not read in the dark

Bad experience; they are not good anymore. They charge too much for luggage seat are so uncomfortable, Flight delays which may miss your next flight, they don’t care if you miss the flight or not. Zero customer services for front desk representatives Istanbul's airport I’m not using this airline any more.

This flight was in the air when the national power outage happened on 28 April 2025 in Spain and Portugal. As a result Lisbon airport was closed and the flight was diverted to Porto. There were no phones, internet or ATMs working and the Turkish Airlines ground crew in Porto were trying to find alternative transport to Lisbon (by bus). This did not materialise until late in the evening. The Turkish Airlines ground crew suggested that passengers may find their own way of getting to Lisbon. That in itself is a failure of Turkish Airlines, but understandable as there were no means of communication. The Turkish Airlines ground crew also said that any expenses insured for travel to Lisbon will be refunded by the Airline through their website. Unfortunately, I could find no way to travel back to Lisbon other than to hitch hike with an Uber driver. Because no systems were available and no credit card payment possible I paid the driver 140 Euros in cash with no receipt as systems were down. I arrived at my Lisbon hotel at 23:30 (flight was scheduled to land at 12:30). Upon contacting Turkish Airlines for compensation they are not willing to do anything as I do not have an invoice for my expenses. They do not even consider the 10 hours of delay and inactivity on their part as a reason to provide any sort of curtesy towards me. I find their behaviour appalling.

I’ve been traveling for 20 years. I tried Turkish airline for the first time horrible horrible service and it would be my last time even if I get offer for a free ticket, I will not accept it. They have races and the worst Flight attendant

It wasn't good. I didn’t understand. They changed 320 dollars for 2 luggage. My ticket was regular and I paid almost 1200.00 dollars. Why they did charge? I want my money back.. thanks Yılmaz polat

Insulting. Lufthansa flight from Munich to EWR had us getting our luggage when we were told in Florence that it would follow us to Indianapolis. It did not. Then very slow security in EWR caused me and three other passengers from Lufthansa flight from Munich to miss the boarding closure. Behind me were two elderly grandparents and their ten year old grandson. We were all refused entry on a plane to Indy that was still at the gate. The doors had not even closed inside the terminal yet. No apologies or compensation offered. Not even a meal voucher let alone a free hotel stay for our inconvenience. I m not sure what the other three passengers behind me did ( they were elderly with a grandson, recall), but I stated 12 hours overnight in a chilly EWR airport until next flight to Indy at 850 next morning.

The food could be better, more snacks. And have some plugs to chargue the phone.

The pasta in the evening meal was tasteless. Otherwise, the flight was okay.

Everything was really great just The aircraft was too old and sounded it will break during takeoff

Seating was average for a first class seat. It very modern. I expected better.

Flight was a little late. The crew was courteous, food ok

Bad! Disaster!! The LH419 was cancelled after 4 hrs on board with no AC and no toilets

Poor food on flight between Toronto and Stockholm Airport Toronto too crowded

Extremely pleased with the crew. Best flight attendants ever! Very friendly, genuinely caring and attentive.

Best flight attendants ever! Very customer and service oriented, courteous, professional and helpful.

Everything you need to know for your flight from Denver to Porto

Information on your arrival and departure airports

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