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C$ 197+ 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 24/6. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
4 May — 11 May1
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 29 April 2025.

Round-trip from

C$ 327

One-way from

C$ 197

Popular in

December

Cheapest in

October

Average price

C$ 657
WestJet
  • WestJet
  • 29/5-4/6
  • 2 total stops
  • 25h 18m total
  • Toronto to Denver
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WestJet
  • WestJet
  • 24/6
  • 1 total stop
  • 17h 42m total
  • Toronto to Boulder
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Highest demand for flights based on searches. 3% potential increase in price (C$ 28 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 13 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 29 April 2025.

Thu 29/56:00 a.m.YHM - DEN
1 stop14h 52mWestJet
Wed 4/612:15 p.m.DEN - YHM
1 stop10h 26mWestJet
Deal found 27/4C$ 327
Thu 19/62:00 p.m.YYZ - DEN
2 stops16h 01mMultiple Airlines
Mon 23/612:15 p.m.DEN - YYZ
1 stop8h 39mMultiple Airlines
Deal found 28/4C$ 391
Thu 26/68:00 p.m.YYZ - DEN
1 stop17h 27mWestJet
Mon 30/612:15 p.m.DEN - YYZ
2 stops25h 31mWestJet
Deal found 28/4C$ 395
Thu 29/53:35 p.m.YTZ - DEN
1 stop18h 27mMultiple Airlines
Mon 2/68:22 p.m.DEN - YTZ
1 stop14h 00mMultiple Airlines
Deal found 28/4C$ 402
Fri 11/76:00 a.m.YKF - DEN
1 stop14h 52mWestJet
Sun 20/712:15 p.m.DEN - YKF
1 stop10h 31mWestJet
Deal found 28/4C$ 520
Wed 4/68:20 a.m.YHM - DEN
2 stops29h 07mMultiple Airlines
Mon 9/612:15 p.m.DEN - YHM
1 stop10h 26mMultiple Airlines
Deal found 27/4C$ 521
Thu 12/68:45 a.m.YYZ - DEN
Nonstop3h 45mAir Canada
Thu 19/65:33 p.m.DEN - YYZ
Nonstop3h 15mAir Canada
Deal found 27/4C$ 575
Wed 18/66:20 p.m.YYZ - DEN
Nonstop3h 40mUnited Airlines
Sun 22/67:45 a.m.DEN - YYZ
Nonstop3h 13mUnited Airlines
Deal found 28/4C$ 596
Sun 22/67:25 p.m.YYZ - DEN
1 stop15h 44mAmerican Airlines
Sat 28/67:21 a.m.DEN - YYZ
1 stop8h 19mAmerican Airlines
Deal found 28/4C$ 631
Sat 30/86:15 a.m.YYZ - DEN
1 stop12h 18mDelta
Mon 1/912:55 a.m.DEN - YYZ
1 stop5h 58mDelta
Deal found 28/4C$ 632
Thu 29/58:25 p.m.YKF - DEN
2 stops24h 27mMultiple Airlines
Wed 4/612:15 p.m.DEN - YKF
1 stop10h 31mMultiple Airlines
Deal found 28/4C$ 637
Wed 13/812:25 p.m.YTZ - DEN
1 stop7h 55mAir Canada
Sun 17/89:40 a.m.DEN - YTZ
1 stop9h 51mAir Canada
Deal found 28/4C$ 725

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 29 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

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Thu 29/5

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

1 stop14h 52m

Denver Intl

Wed 4/6

12:15 p.m.-12:41 a.m.

1 stop10h 26m

C$ 327

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Thu 19/6

2:00 p.m.-4:01 a.m.

2 stops16h 01m

Denver Intl

Mon 23/6

12:15 p.m.-10:54 p.m.

1 stop8h 39m

C$ 391

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Thu 26/6

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

1 stop17h 27m

Denver Intl

Mon 30/6

12:15 p.m.-3:46 p.m.

2 stops25h 31m

C$ 395

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Thu 29/5

3:35 p.m.-8:02 a.m.

1 stop18h 27m

Denver Intl

Mon 2/6

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

1 stop14h 00m

C$ 402

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Fri 11/7

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

1 stop14h 52m

Denver Intl

Sun 20/7

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

1 stop10h 31m

C$ 520

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Wed 4/6

8:20 a.m.-11:27 a.m.

2 stops29h 07m

Denver Intl

Mon 9/6

12:15 p.m.-12:41 a.m.

1 stop10h 26m

C$ 521

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Mon 19/5

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

Nonstop3h 45m

Denver Intl

Sun 25/5

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

Nonstop3h 11m

C$ 586

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 18/6

6:20 p.m.-8:00 p.m.

Nonstop3h 40m

Denver Intl

Sun 22/6

7:45 a.m.-12:58 p.m.

Nonstop3h 13m

C$ 596

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sun 22/6

7:25 p.m.-9:09 a.m.

1 stop15h 44m

Denver Intl

Sat 28/6

7:21 a.m.-5:40 p.m.

1 stop8h 19m

C$ 631

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sat 30/8

6:15 a.m.-4:33 p.m.

1 stop12h 18m

Denver Intl

Mon 1/9

12:55 a.m.-8:53 a.m.

1 stop5h 58m

C$ 632

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/4

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 25 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 Thursday, which is when the least amount of flights are scheduled (5 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$ 343

United Airlines

United Airlines

From C$ 376

WestJet

WestJet

From C$ 186

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 29 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.
Delta
8.0
Very good
7,929 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

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
Delta
8.0
Very good
7,929 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

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
United Airlines
7.4
Good
8,696 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

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
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

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
WestJet
7.2
Good
2,823 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

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
Air Canada
7.0
Good
9,240 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

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$ 374, however they can be found for as little as C$ 63.

  • 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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