Flights from Denver to Lisbon
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From $903 · Prices update daily
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The quick answer
Flights from Denver to Lisbon start around $903 round-trip. Airlines on this route include: Icelandair, Frontier Airlines. Cheapest month to fly: August. Travel authorization required (ESTA-style) (Portugal).
Price calendar — next 60 days
★ Cheapest: $903 on Wed, Aug 12 · FI
Lowest return fares · Prices update daily · Final price confirmed at booking
Price calendar — Denver to Lisbon
Month-by-month lowest fares. Green = cheapest dates.
Flying to Lisbon? Compare from other US cities
Sometimes a nearby airport is cheaper. See Lisbon fares from other departure cities.
Portugal essentials
🟡 Travel authorization required (ESTA-style) · up to 90 days
ETIAS authorization expected to be required for the Schengen Area; visa-free for stays up to 90 days in any 180-day period.
Full Lisbon visa guide →🆘 Emergency
112
💱 Currency
Euro (€)
🕐 Time zone
UTC+0
🗣️ Language
Portuguese
🔌 Plugs
Type C/F · 230V
🚗 Driving
Right side
💡 Tipping
5–10%
📞 Dial code
+351
Entry rules can change — always confirm with official sources before booking.
Stay connected in Lisbon
Skip roaming fees — get a local eSIM before you land. Works in 200+ countries and activates instantly, so you’re online the moment you touch down.
Travel insurance
Protect your Denver to Lisbon trip against delays, cancellations, and medical emergencies. US travelers can compare plans from top insurers.
Airport transfer in Lisbon
Pre-book your ride into Lisbon. Fixed price, meet & greet, and a driver waiting at arrivals — no meter anxiety after a long flight.
Flight delayed or cancelled?
If your Denver to Lisbon flight was delayed more than 3 hours or cancelled, you may be entitled to up to €600 in compensation under EU/UK rules — even if you flew a non-EU airline. Free to check, no win no fee.
More resources
Denver to Lisbon — frequently asked
How much is a flight from Denver to Lisbon?+
Fares start around $903 round-trip, ranging up to about $905 in peak periods. Prices update daily across 800+ airlines.
What is the cheapest month to fly Denver to Lisbon?+
August typically has the lowest fares.
Are there direct flights from Denver to Lisbon?+
This route is usually served by connecting flights. Use the search above to check for any direct options on your dates.
Which airlines fly from Denver to Lisbon?+
Carriers on this route include Icelandair, Frontier Airlines. Compare them side by side in the search above.
Do US citizens need a visa for Portugal?+
Travel authorization required (ESTA-style) for stays up to 90 days. ETIAS authorization expected to be required for the Schengen Area; visa-free for stays up to 90 days in any 180-day period.
What currency is used in Portugal?+
The Euro (EUR, €). The emergency number is 112.
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