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C$ 153+ Cheap flights to Boulder

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 22/6. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
22 Apr — 29 Apr1
1 adult

Flights to Boulder in 2025

Find the latest flights to Boulder in 2025, with up-to-date prices and availability. In the last 7 days, Cheapflights users made a total of 629,999 searches and data was last updated on 17 April 2025.

Round-trip from

C$ 304

One-way from

C$ 153

Popular in

December

Cheapest in

October

Average price

C$ 657
WestJet
  • WestJet
  • 29/6-3/7
  • 2 total stops
  • 26h 39m total
  • Toronto to Denver
WestJet
  • WestJet
  • 22/6
  • 1 total stop
  • 14h 52m total
  • Toronto to Boulder
Highest demand for flights based on searches. 2% potential increase in price (C$ 26 potential increase over avg. RT price).
Cheapest flight prices on average. 1% potential price decrease (C$ 12 potential savings vs. average RT price).
Average for round-trip flights in April 2025

Find flight deals to Boulder

Cheapest flights to Boulder
Explore the most affordable flight options available to Boulder. Find the lowest fares based on data from user searches, with prices last updated on 17 April 2025.

Sun 29/68:00 p.m.YYZ - DEN
1 stop17h 27mWestJet
Thu 3/77:40 p.m.DEN - YYZ
1 stop9h 12mWestJet
Deal found 16/4C$ 304
Thu 24/47:25 p.m.YYZ - DEN
1 stop10h 31mMultiple Airlines
Sat 10/51:33 p.m.DEN - YYZ
2 stops14h 41mMultiple Airlines
Deal found 17/4C$ 392
Thu 28/87:45 p.m.YKF - DEN
1 stop17h 42mWestJet
Mon 1/912:15 p.m.DEN - YKF
1 stop28h 40mWestJet
Deal found 16/4C$ 398
Wed 7/56:00 a.m.YKF - DEN
3 stops37h 27mMultiple Airlines
Mon 12/512:15 p.m.DEN - YKF
1 stop10h 31mMultiple Airlines
Deal found 16/4C$ 423
Thu 28/86:00 a.m.YHM - DEN
1 stop14h 52mWestJet
Mon 1/912:15 p.m.DEN - YHM
1 stop10h 25mWestJet
Deal found 16/4C$ 423
Sun 4/57:00 a.m.YTZ - DEN
2 stops17h 40mMultiple Airlines
Mon 12/58:11 p.m.DEN - YTZ
1 stop14h 11mMultiple Airlines
Deal found 17/4C$ 507
Sun 25/58:45 a.m.YYZ - DEN
Nonstop3h 45mAir Canada
Sat 31/55:33 p.m.DEN - YYZ
Nonstop3h 15mAir Canada
Deal found 17/4C$ 524
Wed 30/47:21 p.m.YYZ - DEN
1 stop5h 48mDelta
Sat 3/512:55 a.m.DEN - YYZ
1 stop7h 29mDelta
Deal found 16/4C$ 552
Thu 12/67:15 p.m.YHM - DEN
1 stop18h 12mMultiple Airlines
Mon 23/612:15 p.m.DEN - YHM
1 stop9h 08mMultiple Airlines
Deal found 16/4C$ 568
Sat 3/54:15 p.m.YYZ - DEN
2 stops8h 24mAmerican Airlines
Thu 8/56:00 a.m.DEN - YYZ
1 stop8h 25mAmerican Airlines
Deal found 16/4C$ 573
Thu 4/912:25 p.m.YTZ - DEN
1 stop7h 53mAir Canada
Sun 7/99:40 a.m.DEN - YTZ
1 stop8h 09mAir Canada
Deal found 16/4C$ 582
Fri 9/58:45 a.m.YYZ - DEN
Nonstop3h 45mUnited Airlines
Mon 19/56:00 a.m.DEN - YYZ
1 stop11h 05mUnited Airlines
Deal found 16/4C$ 685

Cheapflights Fare Finder

Locate flights to Boulder that fit your budget, with regularly updated fares and availability. In the last 7 days, Cheapflights users made a total of 629,999 searches and data was last updated on 17 April 2025.
Use the filters below to find and compare flights to Boulder that are best for you.

Fly from

Toronto

Route

Depart

Return

Price

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sun 29/6

8:00 p.m.-11:27 a.m.

1 stop17h 27m

Denver Intl

Thu 3/7

7:40 p.m.-6:52 a.m.

1 stop9h 12m

C$ 304

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Tue 29/4

7:25 p.m.-3:56 a.m.

1 stop10h 31m

Denver Intl

Fri 9/5

12:15 p.m.-6:14 a.m.

1 stop15h 59m

C$ 392

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Thu 28/8

7:45 p.m.-11:27 a.m.

1 stop17h 42m

Denver Intl

Mon 1/9

12:15 p.m.-6:55 p.m.

1 stop28h 40m

C$ 398

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Wed 7/5

6:00 a.m.-5:27 p.m.

3 stops37h 27m

Denver Intl

Mon 12/5

12:15 p.m.-12:46 a.m.

1 stop10h 31m

C$ 423

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Thu 28/8

6:00 a.m.-6:52 p.m.

1 stop14h 52m

Denver Intl

Mon 1/9

12:15 p.m.-12:40 a.m.

1 stop10h 25m

C$ 423

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Sun 4/5

7:00 a.m.-10:40 p.m.

2 stops17h 40m

Denver Intl

Mon 12/5

8:11 p.m.-12:22 p.m.

1 stop14h 11m

C$ 507

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sat 31/5

8:45 a.m.-10:30 a.m.

Nonstop3h 45m

Denver Intl

Sat 7/6

7:45 a.m.-12:56 p.m.

Nonstop3h 11m

C$ 520

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 30/4

7:21 p.m.-11:09 p.m.

1 stop5h 48m

Denver Intl

Sat 3/5

12:55 a.m.-10:24 a.m.

1 stop7h 29m

C$ 552

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Tue 13/5

6:00 a.m.-1:32 p.m.

1 stop9h 32m

Denver Intl

Sun 18/5

7:00 a.m.-2:30 p.m.

1 stop5h 30m

C$ 564

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Thu 12/6

7:15 p.m.-11:27 a.m.

1 stop18h 12m

Denver Intl

Mon 23/6

12:15 p.m.-11:23 p.m.

1 stop9h 08m

C$ 568

Flights are sorted by cheapest round-trip flights first.

Deals found on 16/4

Showing 1-10 of 24 results
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Best time to book a flight to Boulder

Have a flexible travel schedule? Discover the best time to fly to Boulder with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight to Boulder

When is the best time to book a flight to Boulder?

Use this chart to determine the optimal time to book a round-trip flight from Toronto to Boulder. Price data was last updated on 11 April 2025.

Booking 85 days in advance of your planned departure date is, on average, the best time to get cheap flights to Boulder. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

How long is the flight to Boulder?

On average, a flight from Toronto to Boulder takes 10 hours 17 minutes. Flights to Boulder from other popular cities in Canada will vary in length. Below are a few examples of popular routes and their flight times.

Weekly flight availability to Boulder

The most flights from Toronto to Boulder are scheduled on a Tuesday (9 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (6 on average).

What are the cheapest airlines that fly to Boulder?

The cheapest airlines flying from Toronto to Boulder are WestJet, Air Canada and United Airlines.

Rainfall in Boulder by month

Plan your trip to Boulder by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Boulder ranges from 13.0 - 58.0 mm per month. May is typically the wettest month, when rainfall can reach 58.0 mm. January is typically the driest time to visit Boulder when rainfall is around 13.0 mm.

Temperature in Boulder by month

Plan your trip to Boulder by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Boulder, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -1.0 C).

Reviews of airlines servicing Boulder

Get insights into the airlines that provide service to Boulder. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Boulder. Reviews last updated 17 April 2025.
To help decide which airline to fly to Boulder, see what other customers have to say about Delta, United Airlines and American Airlines. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
8.0
Very good

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

FAQs about flying to Boulder

  • Can I find cheaper flights to Boulder if I am willing to have layovers?

    Yes, flights with layovers are often cheaper than direct flights. Keep an eye out for flight deals to Boulder on Cheapflights that require 1 or 2 stops for potential cost savings.

  • What is the best airline to fly to Boulder?

    Based on reviews from Cheapflights users, WestJet is rated the highest out of the airlines that fly to Boulder.

  • How much is a round-trip flight to Boulder?

    A round-trip flight to Boulder will typically cost around C$ 158, however they can be found for as little as C$ 39.

  • Where does the fastest flight to Boulder depart from?

    For those looking to save time traveling to Boulder, Regina offers the quickest one-way flight (2 hours 13 minutes).

  • Does Denver Intl have rental cars?

    Yes. Those touching down at Denver Intl can take advantage of the rental car services offered upon their arrival.

  • Are there hotels close to Denver Intl?

    Yes. Denver Intl has hotels nearby for those requiring accommodations. The Westin Denver International Airport is the closest property to Denver Intl (0.0 km away from Denver Intl).

See more FAQs

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