Cheap Flights from Buffalo (BUF) to Denver (DEN)

Compare Buffalo Niagara to Denver International flight deals

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Flight deals from Buffalo Niagara to Denver International

Looking for a cheap last-minute deal or the best return flight from Buffalo Niagara Airport to Denver International Airport? If you want to travel next month, return fares start from $318. Find the lowest prices on one-way and return tickets right here.

Denver.$318 per passenger.Departing Wed, 5 Aug, returning Tue, 11 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Buffalo Niagara on Wed, 5 Aug, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Tue, 11 Aug, arriving in Buffalo Niagara.Price includes taxes and charges.From $318, select.

Denver.$343 per passenger.Departing Thu, 15 Oct, returning Tue, 20 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Buffalo Niagara on Thu, 15 Oct, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Tue, 20 Oct, arriving in Buffalo Niagara.Price includes taxes and charges.From $343, select.

Denver.$343 per passenger.Departing Wed, 4 Nov, returning Sat, 14 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Buffalo Niagara on Wed, 4 Nov, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Sat, 14 Nov, arriving in Buffalo Niagara.Price includes taxes and charges.From $343, select.

Denver.$343 per passenger.Departing Thu, 10 Sep, returning Mon, 14 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Buffalo Niagara on Thu, 10 Sep, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Mon, 14 Sep, arriving in Buffalo Niagara.Price includes taxes and charges.From $343, select.

Denver.$363 per passenger.Departing Tue, 25 Aug, returning Tue, 1 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Buffalo Niagara on Tue, 25 Aug, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Tue, 1 Sep, arriving in Buffalo Niagara.Price includes taxes and charges.From $363, select.

Denver.$364 per passenger.Departing Sat, 12 Sep, returning Mon, 12 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Buffalo Niagara on Sat, 12 Sep, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Mon, 12 Oct, arriving in Buffalo Niagara.Price includes taxes and charges.From $364, select.

Denver.$390 per passenger.Departing Sat, 5 Sep, returning Tue, 8 Sep.Return flight with United.Outbound direct flight with United departs from Buffalo Niagara on Sat, 5 Sep, arriving in Denver International.Inbound direct flight with United departs from Denver International on Tue, 8 Sep, arriving in Buffalo Niagara.Price includes taxes and charges.From $390, select.

Denver.$391 per passenger.Departing Sat, 22 Aug, returning Sat, 5 Sep.Return flight with United.Outbound direct flight with United departs from Buffalo Niagara on Sat, 22 Aug, arriving in Denver International.Inbound direct flight with United departs from Denver International on Sat, 5 Sep, arriving in Buffalo Niagara.Price includes taxes and charges.From $391, select.

Denver.$400 per passenger.Departing Wed, 29 Jul, returning Wed, 5 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Buffalo Niagara on Wed, 29 Jul, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Wed, 5 Aug, arriving in Buffalo Niagara.Price includes taxes and charges.From $400, select.

Denver.$441 per passenger.Departing Wed, 26 Aug, returning Mon, 31 Aug.Return flight with United.Outbound direct flight with United departs from Buffalo Niagara on Wed, 26 Aug, arriving in Denver International.Inbound direct flight with United departs from Denver International on Mon, 31 Aug, arriving in Buffalo Niagara.Price includes taxes and charges.From $441, select.

Denver.$441 per passenger.Departing Wed, 4 Nov, returning Sat, 14 Nov.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Buffalo Niagara on Wed, 4 Nov, arriving in Denver International.Inbound direct flight with Southwest Airlines departs from Denver International on Sat, 14 Nov, arriving in Buffalo Niagara.Price includes taxes and charges.From $441, select.

Denver.$441 per passenger.Departing Thu, 1 Oct, returning Tue, 6 Oct.Return flight with United.Outbound direct flight with United departs from Buffalo Niagara on Thu, 1 Oct, arriving in Denver International.Inbound direct flight with United departs from Denver International on Tue, 6 Oct, arriving in Buffalo Niagara.Price includes taxes and charges.From $441, select.

Denver.$515 per passenger.Departing Sat, 25 Jul, returning Tue, 28 Jul.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Buffalo Niagara on Sat, 25 Jul, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Tue, 28 Jul, arriving in Buffalo Niagara.Price includes taxes and charges.From $515, select.

Denver.$545 per passenger.Departing Fri, 31 Jul, returning Tue, 4 Aug.Return flight with United.Outbound direct flight with United departs from Buffalo Niagara on Fri, 31 Jul, arriving in Denver International.Inbound direct flight with United departs from Denver International on Tue, 4 Aug, arriving in Buffalo Niagara.Price includes taxes and charges.From $545, select.

Denver.$546 per passenger.Departing Sat, 12 Sep, returning Mon, 12 Oct.Return flight with United.Outbound direct flight with United departs from Buffalo Niagara on Sat, 12 Sep, arriving in Denver International.Inbound direct flight with United departs from Denver International on Mon, 12 Oct, arriving in Buffalo Niagara.Price includes taxes and charges.From $546, select.

Denver.$581 per passenger.Departing Fri, 4 Dec, returning Tue, 5 Jan.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Buffalo Niagara on Fri, 4 Dec, arriving in Denver International.Inbound indirect flight with Southwest Airlines, departs from Denver International on Tue, 5 Jan, arriving in Buffalo Niagara.Price includes taxes and charges.From $581, select.

Find the cheapest month to fly from Buffalo Niagara to Denver International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Buffalo Niagara to Denver International flights are currently cheapest in August.

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Direct flights from Buffalo Niagara to Denver International

Buffalo Niagara to Denver International: Alternative routes

Compare routes from Buffalo Niagara to Denver below. You may find an airport to fly into that's cheaper, faster, or easier than Denver International.

Denver International

30km from central Denver

ClosestCheapest

from $318

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Buffalo to Denver: Flight information

The things to know before you go.

Cheapest flight found	$318
Cheapest month to fly	August
Average flight time	3 hrs, 37 mins
Most popular airline	Southwest Airlines
Average flights per week	12

Finding cheap flights from Buffalo Niagara to Denver International: Frequently asked questions

How much are return flights from Buffalo Niagara to Denver International?

The best price we found for a return flight from Buffalo Niagara to Denver International is $318. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from Buffalo Niagara to Denver International?

3 hours and 37 minutes is the average flight time from Buffalo Niagara to Denver International.

Which airlines fly direct from Buffalo Niagara to Denver International?

Southwest Airlines and United fly direct from Buffalo Niagara to Denver International.

How many flights are there a week from Buffalo Niagara to Denver International?

As of July 2026, there are 12 flights per week flying from Buffalo Niagara to Denver International.

When is the cheapest time to fly from Buffalo Niagara to Denver International?

The cheapest month to fly from Buffalo Niagara to Denver International is usually August.

Which upcoming date is cheapest to fly from Buffalo Niagara Airport to Denver International Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Buffalo Niagara Airport to Denver International Airport on Wednesday, 5 August 2026.

Can I get a direct flight from Buffalo Niagara Airport to Denver International Airport?

Yes – the average flight time is 3 hours and 37 minutes.

How can I find the best flight deal to Denver International?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Denver International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Denver?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Denver is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from Buffalo Niagara Airport to Denver International with?

Currently, Frontier Airlines and United offer the cheapest flight tickets to Denver International.

Travelling from Buffalo Niagara Airport (BUF) to Denver International Airport (DEN): what you need to know

Hop on a direct flight from Buffalo Niagara Airport to Denver International Airport and you'll be in the air for an average of 3 hours 35 minutes.
Denver's timezone is UTC-7, making Denver two hours behind Buffalo.
Each week, there are nine Buffalo Niagara Airport to Denver International Airport flights. If you'd like to jet off as early as possible, jump on the 05:05 Southwest Airlines flight. If you'd rather make the most of your day before flying, the last flight is at 17:30 with Southwest Airlines.
Arriving two hours before an international flight and one hour ahead of a domestic departure are golden rules for stress-free travel. Get to the airport on time to board your BUF to DEN flight.
You can expect bigger queues during popular months like August. Arriving up to four hours ahead of international flights and two hours for domestic departures will help ensure a smooth travel experience.
You can fly nonstop to Denver, the United States. Prepare for takeoff with one of these airlines offering direct flights from Buffalo Niagara Airport to Denver International Airport:
The airline with the highest passenger demand on this route is United.
United leads the way as the most punctual carrier for BUF to DEN flights, with 89.36% of services arriving as scheduled.
Consider adding a stopover when booking your ticket from Buffalo Niagara Airport to Denver International Airport. Just deselect 'Direct flights only' to break up your journey, or enjoy a detour to a new and interesting place. Check out these options between BUF and DEN:
- Chicago O'Hare International Airport
- Detroit Wayne County Airport
- Chicago Midway Airport

How to find the cheapest flights from Buffalo Niagara Airport (BUF) to Denver International Airport (DEN)

The lowest price we've seen for a one-way Buffalo Niagara Airport to Denver International Airport flight is $149. A return fare right now is $318. Depending on the availability when you book, these fares can change.
To find cheap tickets from BUF to DEN, book as early as you can. Airlines typically offer their best fares when flights are first released.
Schedule your trip for May. That's the cheapest month for flights from Buffalo Niagara Airport to Denver International Airport. If you're flexible with your dates, use the 'Whole month' tool to find the cheapest price across each month.
Landing cheap flights from BUF to DEN is a piece of cake with Price Alerts. All you need to do is set up one of these automatic alerts and we'll get in touch when a new discounted fare appears.
Find the ideal flight for you by using the filters. To see the 'Fastest,' 'Cheapest' or 'Best' flights from Buffalo Niagara Airport to Denver International Airport, use the 'Sort by' tool. You can also filter by airline, departure and arrival times, and number of stops.

Handy information about Buffalo Niagara Airport (BUF)

BUF is located at Genesee Street.
When it comes to Buffalo Niagara Airport's on-time performance, 74% of flights arrive within the expected timeframe.
To get to Buffalo Niagara Airport from central Buffalo, it takes around 20 minutes if you're going by car. This depends on traffic though. It's approximately 16 kilometres from the airport to the city centre.
Planning to catch public transport? You can expect a journey time of around 40 minutes.
Get your break off to a stress-free start by staying near BUF. Whether you've booked an early flight from Buffalo Niagara Airport to Denver International Airport or just don't like being rushed, these stays are perfect:

Arriving at Denver International Airport (DEN)

Get off your Buffalo Niagara Airport to Denver International Airport flight and be in your hotel bed shortly after. If you want a comfy option within easy reach of DEN, make your way to Baymont by Wyndham Denver International Airport.
Pick up a Denver International Airport rental car and discover Denver and beyond with your own wheels. Routes Car Rentals, Dollar and Budget are popular providers you can book with here.
Booking your vehicle from Denver International Airport around one week in advance can help you secure the lowest rate.

Getting from Denver International Airport (DEN) to central Denver

You'll find DEN at 8500 Pena Boulevard.
Denver International Airport to central Denver has a drive time of about 35 minutes. It's approximately 40 kilometres away.
It typically takes 35 minutes to get there by public transport.

When to fly to Denver International Airport (DEN)

It's time to choose your dates for your flight from Buffalo Niagara Airport to Denver International Airport. July is the busiest month to head to Denver. If you'd like a more low-key vibe, go in January.
Book your flight from Buffalo Niagara Airport to Denver International Airport for July if you'd like to explore Denver during its warmest month. You can expect temperatures of between 14ºC (57ºF) and 32ºC (90ºF).
January sees average temperatures of between -9ºC (16ºF) and 7ºC (45ºF). Look for cheap tickets from BUF to DEN around that time if you like travelling in cooler conditions.

Explore more of the United States

Denver has loads to offer, but there are so many other corners of the United States waiting to be discovered. Around 105 kilometres south of Denver, a trip to Colorado Springs will keep you on the go. Don't miss top attractions like Garden of the Gods, Pikes Peak Region Attractions and Red Rock Canyon.
Around 13 kilometres east of Denver, Aurora is another favourite stop in the United States. Experience the best of this destination with a visit to Plains Conservation Centre, DeLaney Homestead Historic District and Aircraft viewing.