$355 Cheap Flights from Denver (DEN) to Lisbon (LIS)

Denver (DEN) to Lisbon (LIS) at a glance

Explore an array of airlines offering flights from Denver (DEN) to Lisbon (LIS) on this international long-haul route. Compare various full-service carriers to find the perfect itinerary that aligns with your travel budget, schedule, and plans as you discover the iconic sights and neighborhoods of Lisbon. Here, you’ll find essential information for flights departing from Denver International Airport (DEN) to Humberto Delgado Airport (LIS).

• Fastest flight duration: around 10h 45m in-flight, plus roughly 2h 15m layover with one stop
• Route distance: roughly 4,800 miles (7,720 km)
• Flights per week: around 11 departures on average
• Typical fares (one-way): economy tickets often range from $285–$925, depending on seasonality and how far ahead you book

Flights from Denver International Airport (DEN) to Humberto Delgado Airport (LIS)

According to recent traveler bookings, the top airlines flying from Denver to Lisbon are favored for their one-stop and multi-stop flights, often featuring popular layovers at Heathrow Airport (LHR, approximately 2 hours 15 minutes), Washington Dulles International Airport (IAD, about 1 hour 15 minutes), and Newark Liberty International Airport (EWR, roughly 2 hours). These options allow you to customize your journey by balancing price, total travel time, and cabin class to secure the best itinerary.

• United: As a comprehensive service airline, United offers one-stop flights with one-way prices generally falling between $285 and $925. This carrier handles roughly 45% of the departures on this route, featuring an in-flight duration of 10 hours and 45 minutes, totaling about 14 hours of travel time including layovers.
• British Airways: With its one-stop service, British Airways provides a full-service experience, with one-way fares typically ranging from $285 to $790. This airline represents around 12% of the departures on this route, maintaining an in-flight time of 10 hours and 45 minutes and an overall journey duration of about 14 hours, including layovers.
• Air Canada: Offering a full-service experience with one-stop flights, Air Canada has one-way fares that usually range from $285 to $1010. It accounts for approximately 7% of departures on this route, featuring an in-flight time of 10 hours and 45 minutes, leading to a total travel time of around 14 hours, inclusive of layovers.
• American Airlines: This full-service carrier provides one-stop service with one-way fares generally between $350 and $900. American Airlines comprises about 6% of the departures on this route, with a flight duration of 10 hours and 45 minutes and an estimated total journey time of roughly 14 hours, including layover periods.
• Virgin Atlantic: As a full-service airline offering one-stop flights, Virgin Atlantic's one-way fares are typically priced between $330 and $650. This carrier makes up around 5% of the departures on this route, with an in-flight time of 10 hours and 45 minutes and a total travel time of approximately 14 hours, factoring in layovers.

Best time to fly from Denver (DEN) to Lisbon (LIS)

The most popular months for travelers flying from Denver to Lisbon are March, April, and May, when peak temperatures in Lisbon reach up to 64.8°F in May. If you prefer quieter travel, consider November, the least busy time to visit with temperatures around 59.9°F and typically the lowest average one-way fare (around $358). Flight availability peaks in June, with approximately 14 flights per week, making it easier to find convenient departure times. January has the fewest flights, with approximately 7 flights per week.

• Cheapest time to fly: November usually offers good deals with average one-way fare around $358, roughly 32% cheaper than the yearly average.
• Another budget-friendly time to fly: February typically offers an average one-way fare of around $369.
• Most flight options: June has the highest number of flights from Denver to Lisbon, with approximately 14 flights per week, giving you more flexibility in scheduling your trip.

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative routes from Denver (DEN) to Lisbon (LIS)

• Denver to Cascais (DEN-CAT): Located approximately 12 miles from Humberto Delgado Airport (LIS), Cascais Airport (CAT) offers convenient access to the region.
• Fort Collins to Lisbon (FNL-LIS): Fort Collins-Loveland Municipal Airport (FNL) is around 45 miles distant from Denver International Airport (DEN), providing an accessible travel option.
• Colorado Springs to Lisbon (COS-LIS): Situated about 73 miles from Denver International Airport (DEN), Colorado Springs Airport (COS) serves as a viable departure point.

How to find the best prices for flights from Denver (DEN) to Lisbon (LIS)

Getting some of the best deals on flights from Denver to Lisbon is all about timing and flexibility. Here are some key tips to help you save:

1. Best times to book and fly: cheaper fares are typically found when booking within two weeks, although most travelers book at least two months in advance. Morning departures between 5 am and 12 pm tend to offer lower prices, while afternoon flights from 12 pm to 6 pm are more popular. Additionally, flying on Tuesday usually provides cheaper rates, but Wednesday is the most common travel day.
2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.* Find Lisbon hotel and flight deals.
4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Humberto Delgado Airport from Denver International Airport

Lisbon welcomes travelers from Denver with a range of transport options based on price, convenience, and proximity. Here's how to reach Lisbon efficiently:

• Hotel transfer: Transfers offer a convenient way to reach your hotel in Lisbon, with options including free hotel shuttles and private rides, which can be arranged in advance with your hotel.
• Car rental: Renting a car from Humberto Delgado Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Humberto Delgado Airport on Expedia.
• Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
• Public transportation: From Humberto Delgado Airport, Lisbon Airport Station (a metro station) is located about 0.1 miles away on foot, while Oriente Bus Station (a bus station) and Roma-Areeiro Station (a train station) are both about 1.8 miles away by car, providing convenient access to various transport options for travelers.

Denver to Lisbon Flights

The cheapest times to fly from Denver to Lisbon

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Denver to Lisbon are during the month of November. You can find some of the cheapest flights from Denver to Lisbon with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Denver to Lisbon

Sunday is one of the best days to book for cheap flights from Denver to Lisbon: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from Denver to Lisbon

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Denver to Lisbon in 2026. You can also book with separate airlines for your outbound and return journeys, from $355 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Denver to Lisbon flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your Denver to Lisbon airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.