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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
20 Apr — 27 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 15 April 2025.

Round-trip from

C$ 426

One-way from

C$ 153

Popular in

December

Cheapest in

October

Average price

C$ 657
Air Canada
  • Air Canada
  • 29/5-5/6
  • 1 total stop
  • 14h 02m total
  • Toronto to Denver
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WestJet
  • WestJet
  • 22/6
  • 1 total stop
  • 14h 52m total
  • Toronto to Boulder
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Highest demand for flights based on searches. 2% potential increase in price (C$ 25 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 12 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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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 15 April 2025.

Thu 29/510:00 a.m.YYZ - DEN
1 stop10h 52mMultiple Airlines
Thu 5/611:25 a.m.DEN - YYZ
Nonstop3h 10mMultiple Airlines
Deal found 14/4C$ 426
Fri 4/79:00 a.m.YYZ - DEN
2 stops28h 27mWestJet
Wed 13/812:15 p.m.DEN - YYZ
2 stops15h 36mWestJet
Deal found 14/4C$ 429
Thu 4/97:45 p.m.YKF - DEN
1 stop17h 39mWestJet
Sun 7/912:15 p.m.DEN - YKF
1 stop10h 30mWestJet
Deal found 14/4C$ 438
Thu 1/56:15 a.m.YKF - DEN
2 stops31h 12mMultiple Airlines
Wed 7/512:15 p.m.DEN - YKF
2 stops15h 15mMultiple Airlines
Deal found 14/4C$ 444
Thu 4/96:00 a.m.YHM - DEN
1 stop14h 48mWestJet
Sun 7/912:15 p.m.DEN - YHM
1 stop10h 25mWestJet
Deal found 14/4C$ 463
Mon 12/58:45 a.m.YTZ - DEN
1 stop13h 35mMultiple Airlines
Mon 19/58:11 p.m.DEN - YTZ
1 stop14h 11mMultiple Airlines
Deal found 14/4C$ 505
Wed 6/89:44 a.m.YYZ - DEN
Nonstop3h 44mAir Canada
Sat 9/811:25 a.m.DEN - YYZ
Nonstop3h 10mAir Canada
Deal found 14/4C$ 513
Sat 7/612:25 p.m.YTZ - DEN
2 stops13h 05mAir Canada
Mon 9/68:50 p.m.DEN - YTZ
2 stops16h 00mAir Canada
Deal found 15/4C$ 545
Sat 7/612:30 p.m.YYZ - DEN
1 stop5h 04mDelta
Fri 13/611:05 a.m.DEN - YYZ
1 stop7h 39mDelta
Deal found 15/4C$ 553
Fri 16/55:20 p.m.YYZ - DEN
1 stop8h 39mAmerican Airlines
Sun 18/56:15 a.m.DEN - YYZ
1 stop6h 44mAmerican Airlines
Deal found 14/4C$ 624
Mon 19/510:15 a.m.YYZ - DEN
Nonstop3h 54mUnited Airlines
Wed 28/58:50 p.m.DEN - YYZ
1 stop12h 59mUnited Airlines
Deal found 14/4C$ 685
Wed 25/67:15 p.m.YHM - DEN
1 stop18h 12mMultiple Airlines
Mon 30/612:15 p.m.DEN - YHM
1 stop9h 08mMultiple Airlines
Deal found 14/4C$ 950

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 15 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

Thu 29/5

10:00 a.m.-6:52 p.m.

1 stop10h 52m

Denver Intl

Thu 5/6

11:25 a.m.-4:35 p.m.

Nonstop3h 10m

C$ 426

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Fri 4/7

9:00 a.m.-11:27 a.m.

2 stops28h 27m

Denver Intl

Wed 13/8

12:15 p.m.-5:51 a.m.

2 stops15h 36m

C$ 429

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Thu 4/9

7:45 p.m.-11:24 a.m.

1 stop17h 39m

Denver Intl

Sun 7/9

12:15 p.m.-12:45 a.m.

1 stop10h 30m

C$ 438

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Thu 1/5

6:15 a.m.-11:27 a.m.

2 stops31h 12m

Denver Intl

Wed 7/5

12:15 p.m.-5:30 a.m.

2 stops15h 15m

C$ 444

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Thu 4/9

6:00 a.m.-6:48 p.m.

1 stop14h 48m

Denver Intl

Sun 7/9

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

1 stop10h 25m

C$ 463

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Mon 12/5

8:45 a.m.-8:20 p.m.

1 stop13h 35m

Denver Intl

Mon 19/5

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

1 stop14h 11m

C$ 505

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 6/8

9:44 a.m.-11:28 a.m.

Nonstop3h 44m

Denver Intl

Sat 9/8

11:25 a.m.-4:35 p.m.

Nonstop3h 10m

C$ 513

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Sat 7/6

12:25 p.m.-11:30 p.m.

2 stops13h 05m

Denver Intl

Mon 9/6

8:50 p.m.-2:50 p.m.

2 stops16h 00m

C$ 545

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sat 7/6

12:30 p.m.-3:34 p.m.

1 stop5h 04m

Denver Intl

Fri 13/6

11:05 a.m.-8:44 p.m.

1 stop7h 39m

C$ 553

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Fri 16/5

5:20 p.m.-11:59 p.m.

1 stop8h 39m

Denver Intl

Sun 18/5

6:15 a.m.-2:59 p.m.

1 stop6h 44m

C$ 624

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/4

Showing 1-10 of 25 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 Monday (10 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 most popular airlines that fly to Boulder?

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

Air Canada

Air Canada

From C$ 354

United Airlines

United Airlines

From C$ 377

WestJet

WestJet

From C$ 218

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 15 April 2025.
To help decide which airline to fly to Boulder, see what other customers have to say about Alaska Airlines, Delta and United 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.
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Entertainment

7.1

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,871 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Entertainment

7.1

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,917 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Entertainment

7.1

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,656 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Entertainment

7.1

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Entertainment

7.1

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
WestJet
7.2
Good
2,805 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Entertainment

7.1

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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 15 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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