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

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Compare Buffalo Niagara to Denver International flight deals

Find the cheapest month or even day of the year to fly to Denver International

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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 to Denver International? Find the lowest prices on one-way and return tickets right here.
Denver.$291 per passenger.Departing Fri, 5 Sep, returning Mon, 8 Sep.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Buffalo Niagara on Fri, 5 Sep, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Mon, 8 Sep, arriving in Buffalo Niagara.Price includes taxes and charges.From $291, select.
Denver.$293 per passenger.Departing Fri, 4 Jul, returning Fri, 11 Jul.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Buffalo Niagara on Fri, 4 Jul, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Fri, 11 Jul, arriving in Buffalo Niagara.Price includes taxes and charges.From $293, select.
Denver.$293 per passenger.Departing Fri, 15 Aug, returning Fri, 22 Aug.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Buffalo Niagara on Fri, 15 Aug, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Fri, 22 Aug, arriving in Buffalo Niagara.Price includes taxes and charges.From $293, select.
Denver.$332 per passenger.Departing Mon, 29 Sep, returning Sun, 5 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Buffalo Niagara on Mon, 29 Sep, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Sun, 5 Oct, arriving in Buffalo Niagara.Price includes taxes and charges.From $332, select.
Denver.$337 per passenger.Departing Thu, 9 Oct, returning Sun, 12 Oct.Return flight with United.Outbound direct flight with United departs from Buffalo Niagara on Thu, 9 Oct, arriving in Denver International.Inbound direct flight with United departs from Denver International on Sun, 12 Oct, arriving in Buffalo Niagara.Price includes taxes and charges.From $337, select.
Denver.$337 per passenger.Departing Wed, 18 Jun, returning Mon, 23 Jun.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Buffalo Niagara on Wed, 18 Jun, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Mon, 23 Jun, arriving in Buffalo Niagara.Price includes taxes and charges.From $337, select.
Denver.$349 per passenger.Departing Fri, 4 Jul, returning Fri, 1 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Buffalo Niagara on Fri, 4 Jul, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Fri, 1 Aug, arriving in Buffalo Niagara.Price includes taxes and charges.From $349, select.
Denver.$368 per passenger.Departing Wed, 27 Aug, returning Wed, 3 Sep.Return flight with Delta.Outbound indirect flight with Delta, departs from Buffalo Niagara on Wed, 27 Aug, arriving in Denver International.Inbound indirect flight with Delta, departs from Denver International on Wed, 3 Sep, arriving in Buffalo Niagara.Price includes taxes and charges.From $368, 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 September.
May
from $1,547
Jun
from $337
Jul
from $293
Aug
from $293
Sep
from $291
Oct
from $337
Nov
from $567
Dec
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Jan
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Feb
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Mar
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Apr
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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.

Buffalo to Denver: Flight information

The things to know before you go.
Cheapest flight found$291
Cheapest month to flySeptember
Average flight time3 hrs, 39 mins
Most popular airlineSouthwest Airlines
Average flights per week13

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

The best price we found for a return flight from Buffalo Niagara to Denver International is $291. 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.
3 hours and 39 minutes is the average flight time from Buffalo Niagara to Denver International.
Southwest Airlines, United and Frontier Airlines fly direct from Buffalo Niagara to Denver International.
As of May 2025, there are 13 flights per week flying from Buffalo Niagara to Denver International.
The cheapest month to fly from Buffalo Niagara to Denver International is usually May 2025.
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 Friday, 5 September 2025.
Yes – the average flight time is 3 hours and 39 minutes.
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.
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.
Currently, Frontier Airlines offers the cheapest flight tickets to Denver International.

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

  • Around 3 hours 35 minutes is how long you can expect to be in the air on a direct flight from Buffalo Niagara International Airport to Denver International Airport.

  • Denver is two hours behind Buffalo and follows the UTC-6 timezone.

  • Flights from BUF to DEN start at 05:50 — the earliest with Southwest Airlines. The last service of the day is at 22:54 with Frontier Airlines. Overall, there are eight weekly Buffalo Niagara International Airport to Denver International Airport flights.

  • Your BUF to DEN flight won't wait if you're running late, so get to the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead when you're travelling internationally.

  • Travelling during a peak month like August? Public holidays and other high seasons can lead to longer queues and delays at airport checkpoints. Be extra cautious and arrive up to four hours ahead of an international flight and two hours before a domestic departure.

  • Jetting into Denver (and then exploring more of United States!) is easy with Frontier Airlines. This popular carrier offers direct flights from Buffalo Niagara International Airport to Denver International Airport.

  • The majority of passengers choose to travel with Frontier Airlines on this route.

  • Southwest Airlines is the most punctual carrier operating BUF to DEN flights, with 77.14% of its services arriving as scheduled.

  • We make it easy to book a flight with a stopover. To see your options for tickets from Buffalo Niagara International Airport to Denver International Airport, uncheck 'Direct flights only.' Then, pick a flight with a stop long enough to visit the city of your choice. Some great stopovers between BUF and DEN include:

    • Chicago Midway International Airport

    • Detroit Metropolitan Wayne County Airport

    • O'Hare International Airport

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

  • At the moment, $145 is the cheapest price we've found for a one-way Buffalo Niagara International Airport to Denver International Airport flight. The best price for a return plane ticket is $291. Bear in mind that fares can change due to demand when booking.

  • Book six months before your departure date. After looking at the numbers on our calendar, this is how far you'll want to book ahead to secure cheap tickets from BUF to DEN.

  • Plan your trip for May. That's the cheapest month for flights from Buffalo Niagara International Airport to Denver International Airport. If you're flexible with your travel dates, try out the 'Whole month' tool to find the lowest price across every month.

  • Cut down on the time spent looking for cheap flights from BUF to DEN by setting up a Price Alert. You'll get an email or push notification on the app when a lower fare becomes available.

  • Pick your ideal departure and arrival times, number of stops and airlines with the filters. Or sort your results by 'Cheapest' to find the best deals on flights from Buffalo Niagara International Airport to Denver International Airport.

Handy information about Buffalo Niagara International Airport (BUF)

  • BUF is located at Genesee Street.

  • 75.46% of flights that leave from Buffalo Niagara International Airport arrive at their destination on time.

  • To reach Buffalo Niagara International Airport from central Buffalo, it takes around 20 minutes if you're travelling by car. Of course, this depends on traffic conditions. It's approximately 18 kilometres from the airport to the city centre.

  • Taking public transport? Expect a trip time of around 1 hour 15 minutes.

  • Have an early flight from Buffalo Niagara International Airport to Denver International Airport? Avoid the hassle of rushing to the airport (and enjoy a little extra shut-eye) by picking one of these stays near BUF:

Arriving at Denver International Airport (DEN)

  • Get off your Buffalo Niagara International Airport to Denver International Airport flight and be snoozing in your hotel bed shortly after. If you're looking for a convenient option a short journey from DEN, check out Baymont by Wyndham Denver International Airport.

  • Fast-track your adventure by picking up a Denver International Airport rental car. Grab a set of wheels from Routes Car Rentals, Dollar or Budget and explore beyond Denver's main sights.

  • Lock in the best deal by booking your ride from Denver International Airport about one week ahead of your departure.

Getting from Denver International Airport (DEN) to central Denver

  • The address for DEN is 8500 Pena Boulevard.

  • Denver International Airport to central Denver has a drive time of about 35 minutes. It's approximately 40 kilometres away.

  • Travelling to the centre on public transport typically takes 1 hour 30 minutes.

When to fly to Denver International Airport (DEN)

  • It's time to work out your travel dates for your flight from Buffalo Niagara International Airport to Denver International Airport. July is the most popular month to visit Denver. If you like a more low-key vibe, go in April.

  • Lock in your flight from Buffalo Niagara International Airport to Denver International Airport for July if you want to go to Denver during its warmest month. Expect temperatures of between 14ºC (57ºF) and 32ºC (90ºF).

  • Look for cheap tickets from BUF to DEN in January if you like travelling in cooler conditions. Temperatures are at their lowest then, ranging between -9ºC (16ºF) and 7ºC (45ºF) on average.

Explore more of United States

  • Denver has plenty going for it, but there are so many other parts of United States you should also see. Around 105 kilometres south of Denver, a visit to Colorado Springs will keep you busy. Check out popular attractions like US Northern Command (USNORTHCOM) / North American Aerospace Defence Command (NORAD) Headquarters, Cheyenne Mountain Air Force Station and National Strength and Conditioning Association (NSCA).

  • Around 13 kilometres east of Denver, Aurora is another favourite stop in United States. Experience the best of this destination with a visit to Magellan's Travel Solutions and Gear, The Fairways at Lowry and Retired Enlisted Association Inc.

Plan the rest of your trip from Buffalo to Denver

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.