DEN - OPO

$360 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 8/25. 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, 0 bags

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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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$758
Typical prices: $997-$706
United Airlines
Fri 10/30Thu 11/5
DEN - OPO • 1 stop
Cheapest one-way
$368
Typical prices: $606-$847
Multiple Airlines
Tue 8/25
DEN - OPO • 3 stops
Top airlines
Cheapest • from $758 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
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Nonstop flights
Not available
There are currently no direct flights between Denver and Porto. You'll need at least 1 connection.
Insights
Insights
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Insights
Top layover airports
Cheapest • Avg $871 (round-trip)
Shortest trip • 12h 38m (one-way)
Insights
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Insights
When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 52% compared to booking last minute.
Insights
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Insights
When to travel
Cheapest • 25% price drop
Most popular
Good to know
Good to know
+1
+1
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Good to know
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Porto!
Flight Deals
Booking Insights
Flight 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

Fri, Oct 30 - Thu, Nov 5
United Airlines Logo
4:00 pm - 9:30 am
DEN
-
OPO
11h 30m
1 stop
United Airlines Logo
6:00 am - 4:00 pm
OPO
-
DEN
17h 00m
1 stop
$758United Airlines
Fri, Oct 30 - Thu, Nov 5
United Airlines Logo
7:58 am - 9:30 am
DEN
-
OPO
19h 32m
2 stops
United Airlines Logo
6:00 am - 4:00 pm
OPO
-
DEN
17h 00m
1 stop
$762United Airlines
Fri, Oct 30 - Thu, Nov 5
United Airlines Logo
7:58 am - 9:30 am
DEN
-
OPO
19h 32m
2 stops
United Airlines Logo
12:30 pm - 12:58 am
OPO
-
DEN
19h 28m
2 stops
$773United Airlines
Thu, Sep 10 - Sat, Sep 19
Turkish Airlines Logo
8:25 pm - 9:45 am
DEN
-
OPO
30h 20m
1 stop
Turkish Airlines Logo
10:45 am - 6:25 pm
OPO
-
DEN
38h 40m
1 stop
$780Turkish Airlines
Thu, Aug 20 - Thu, Sep 3
Turkish Airlines Logo
8:25 pm - 3:40 pm
DEN
-
OPO
36h 15m
1 stop
Turkish Airlines Logo
6:10 am - 6:25 pm
OPO
-
DEN
19h 15m
1 stop
$791Turkish Airlines
Tue, Sep 29 - Thu, Oct 8
Multiple Airlines Logo
11:25 am - 4:00 pm
DEN
-
OPO
21h 35m
2 stops
Multiple Airlines Logo
6:20 am - 11:08 pm
OPO
-
DEN
23h 48m
2 stops
$800Multiple Airlines
Wed, Oct 7 - Tue, Oct 13
Multiple Airlines Logo
11:25 am - 7:00 am
DEN
-
OPO
12h 35m
1 stop
Multiple Airlines Logo
6:20 am - 2:20 pm
OPO
-
DEN
15h 00m
1 stop
$806Multiple Airlines
Tue, Sep 29 - Thu, Oct 8
Multiple Airlines Logo
9:40 am - 7:00 am
DEN
-
OPO
14h 20m
1 stop
Multiple Airlines Logo
6:20 am - 2:20 pm
OPO
-
DEN
15h 00m
1 stop
$809Multiple Airlines
Wed, Sep 30 - Tue, Oct 13
United Airlines Logo
9:40 am - 7:00 am
DEN
-
OPO
14h 20m
1 stop
United Airlines Logo
12:15 pm - 12:21 pm
OPO
-
DEN
31h 06m
2 stops
$818United Airlines
Tue, Sep 29 - Thu, Oct 8
Turkish Airlines Logo
8:25 pm - 11:30 pm
DEN
-
OPO
20h 05m
1 stop
Turkish Airlines Logo
6:10 am - 6:25 pm
OPO
-
DEN
19h 15m
1 stop
$819Turkish Airlines
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.

How much is a round-trip flight from Denver to Porto?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Denver to Porto departing in October.

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 February, where tickets cost $723 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $1,282 and $1,168 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 2 weeks before departure, which saves you about 52% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 19 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$368
Best time to beat the crowds with an average 25% drop in price.
Most popular time to fly and prices are also 2% lower on average.
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 $368 for a one-way ticket and $758 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 is the only airline alliance operating flights between Denver and Porto.

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

    The two airlines most popular with KAYAK users for flights from Denver to Porto are United Airlines and Turkish Airlines. With an average price for the route of $966 and an overall rating of 7.4, United Airlines is the most popular choice. Turkish Airlines is also a great choice for the route, with an average price of $732 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 3 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.
7.4
Turkish AirlinesOverall score based on 4354 reviews
7.3Comfort
7.5Food
7.5Entertainment
7.8Crew
7.3Boarding
Airline reviews

Seats were very tight with poor legroom - and I am average height. During the 12 hour flight, tiny paper cups of drinks we're only offered during the super and breakfast services, with the crew nowhere to be seen in between. One of the bathrooms was out of order, leading to long lines waiting to use the remaining two available to the economy class passengers.

4.0 OkayAnonymous, May 2026
LAX - IST
Read more Turkish Airlines reviews

Seats were very tight with poor legroom - and I am average height. During the 12 hour flight, tiny paper cups of drinks we're only offered during the super and breakfast services, with the crew nowhere to be seen in between. One of the bathrooms was out of order, leading to long lines waiting to use the remaining two available to the economy class passengers.

short flight but we still got a very nice lunch and the crew did an excellent job in taking care of us

For that price on Business class, I expected to have the pod seats. These were configured as 2/3/2 and my seat mate talked half the flight with a friend across the isle, loudly. Very uncouth.

The ground crew members at check in counter were courteous. The boarding was seamless. Flight departed as scheduled. Service on board was great

Very comfortable in business class. Excellent service. Good food. Smooth trip.

The seats seems abit small and the reclining is too much, the seat in front of me came back too much and made it uncomfortable for me.

As a first time flyer with Turkish Airlines. My experience was very good due to the factor that there were to many passengers on the my first flight compared to my connecting flight. However, I know that nothing is perfect and all companies are trying to accommodate their passengers to the best way possible. I will always say, a FEW INCHES will go LONG WAY. That's something all airliners should consider, and not only the money aspect!!! A long time commitment is better than one time service! Thank you

Flight was delayed. While standing at the gate, a note appeared on the sign saying the gate had changed to a gate far away. No member of the Turkish airlines team got on the microphone to instruct passengers to go to the other gate, to ignore the chiron, etc. Finally, the message disappeared. Eventually, the flight began to board. Very slowly. More slowly than I experience with other airlines. Though Istanbul may just be slow . . . In all other ways, great flight, great entertainment (top notch movies), great service, excellent food, comfortable lie-flat seat, dimmed lights, etc.

Staff at the airport wasn't helpful or friendly. Probably the worst airport experience I have ever had, going and coming. The staff on the plane was better. Still not super friendly or personable. However, they were not rude like airport staff. They ran out of certain menu items. Maybe could have been prepared better? Overall just ok.

It was a pleasant experience. In flight entertainment could have been better

O’hsre taxi and deboarding took 40 minutes. Needed 20 minutes extra time between connecting flights to avoid running through terminal.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

Really hard landing... as in slammed into the runway then hit the brakes really hard ...

Putting people that close to the bathroom, where you have to look into the bathroom as people are exiting and entering was not great and the smell was also not great. I know the airlines are desperate for more chairs, but that seat is a crime.

Every staff member was professional, friendly and courteous. The pizza twist was ok. It was warm but too much dough.

one staffer was frustrated (it happen); the flight was late and the pilot mentioned they'll make amend but the snacks were the same, other than that the aircraft was clean and everything went smooth, no complaints

Wonderful in-seat entertainment with seatback screens and huge selection of quality movies. The ability to bluetooth connect headphones was amazing.

No seat back entertainment. And app had a hard time getting entertainment loaded.

ticket agent lady wás very helpful , she arranged wheel chair for my elderly mother

Flight left on time and we arrived 25 minutes early! There was a gate available when we arrived so early on a busy Sunday afternoon! Flight attendants came around twice with the drinks cart.

Definitely get premium economy on a flight this long if you can. Your legs and while body will thank you.

Flight was delayed by several hours and then cancelled due to weather. But Staff was very helpful getting me on a different flight. United should offer food coupons and tooth brush and paste for stranded passengers

I upgraded to the business class cabin. It was the poorest business class I have ever experienced. No access to any business lounge in Tampa airport. Seats are not comfortable. I had a window seat and had to step/crawl over the next seat. Food was mediocre and service below average for business class. Bathroom location was ridiculous. No place to wait. I cannot believe I paid this kind of money and will never fly Lufthansa Discover again. They really should reimburse me somehow.

Boarding was disorganized. The door to one to the toilets wouldn’t lock. The plane was shockingly cramped, and clearly used for domestic flights due to the menus for items to sell domestic travelers. United should be ashamed of its small seats, tiny unclean toilets, and money grubbing stance toward services, compared to Lufthansa, Emirates, and most international carriers United is awful.

Was never allowed on and not refunded the full amount of the ticket plus charged a $300 processing fee.

Terrible. Lost our luggage for 4 days. Did not advise passengers there was a strike in Barcelona Airport and had zero personnel on hand at airport to advise passengers on where to go to file claims. We had to fend for ourselves. No assistance at all other than an online claims submission process that we had to find out about on our own.

Lufthansa cancelled our flight from Los Angeles to Naples Italy on March 10 for scheduled flight on March 12 Very stressful experience trying to arrange alternatives. Will never fly again with Lufthansa

Everything could have been better. What needed to be wrong with United went wrong

The staff was bit rude when I asked for an extra drink after one beer, asked for one wine glass.

Very good, i got two seats for myself, and was comfortable with the blanket i got

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

Information on your arrival and departure airports