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C$ 209+ 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 7/4. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
30 Mar — 6 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 25 March 2025.

Round-trip from

C$ 436

One-way from

C$ 209

Popular in

December

Cheapest in

October

Average price

C$ 695
WestJet
  • WestJet
  • 8/8-12/8
  • 2 total stops
  • 25h 18m total
  • Toronto to Denver
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7/4
  • 7/4
  • 2 total stops
  • 15h 56m total
  • Toronto to Boulder
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Highest demand for flights based on searches. 1% potential increase in price (C$ 11 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 10 potential savings vs. average RT price).
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Average for round-trip flights in March 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 25 March 2025.

Fri 8/86:00 a.m.YHM - DEN
1 stop14h 52mWestJet
Tue 12/812:15 p.m.DEN - YHM
1 stop10h 26mWestJet
Deal found 24/3C$ 436
Wed 14/58:00 p.m.YYZ - DEN
1 stop17h 27mWestJet
Fri 16/512:15 p.m.DEN - YYZ
1 stop16h 37mWestJet
Deal found 24/3C$ 466
Thu 29/56:00 a.m.YKF - DEN
1 stop14h 52mWestJet
Tue 3/612:15 p.m.DEN - YKF
1 stop10h 31mWestJet
Deal found 24/3C$ 483
Fri 23/59:00 a.m.YYZ - DEN
1 stop11h 52mMultiple Airlines
Tue 27/510:29 p.m.DEN - YYZ
1 stop19h 30mMultiple Airlines
Deal found 24/3C$ 491
Mon 28/48:55 p.m.YTZ - DEN
1 stop14h 14mMultiple Airlines
Thu 1/53:42 p.m.DEN - YTZ
1 stop18h 40mMultiple Airlines
Deal found 24/3C$ 509
Tue 17/67:15 p.m.YHM - DEN
1 stop18h 12mMultiple Airlines
Mon 23/612:15 p.m.DEN - YHM
1 stop10h 26mMultiple Airlines
Deal found 24/3C$ 546
Tue 22/48:35 a.m.YYZ - DEN
Nonstop3h 45mAir Canada
Sat 26/411:15 a.m.DEN - YYZ
Nonstop3h 11mAir Canada
Deal found 23/3C$ 549
Sun 11/59:25 a.m.YKF - DEN
2 stops28h 02mMultiple Airlines
Sat 17/512:15 p.m.DEN - YKF
1 stop10h 31mMultiple Airlines
Deal found 24/3C$ 550
Tue 22/46:10 p.m.YYZ - DEN
1 stop7h 30mDelta
Tue 29/412:55 a.m.DEN - YYZ
1 stop7h 29mDelta
Deal found 23/3C$ 564
Fri 2/512:25 p.m.YTZ - DEN
1 stop7h 55mAir Canada
Sun 11/59:40 a.m.DEN - YTZ
1 stop8h 10mAir Canada
Deal found 24/3C$ 607
Mon 14/44:15 p.m.YYZ - DEN
2 stops18h 46mFrontier
Sun 20/48:50 p.m.DEN - YYZ
2 stops13h 05mFrontier
Deal found 24/3C$ 632
Fri 18/41:15 p.m.YYZ - DEN
1 stop11h 24mAmerican Airlines
Wed 23/47:20 a.m.DEN - YYZ
1 stop5h 14mAmerican Airlines
Deal found 24/3C$ 636

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 25 March 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

Fri 8/8

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

1 stop14h 52m

Denver Intl

Tue 12/8

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

1 stop10h 26m

C$ 436

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 14/5

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

1 stop17h 27m

Denver Intl

Fri 16/5

12:15 p.m.-6:52 a.m.

1 stop16h 37m

C$ 466

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Thu 29/5

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

1 stop14h 52m

Denver Intl

Tue 3/6

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

1 stop10h 31m

C$ 483

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Fri 23/5

9:00 a.m.-6:52 p.m.

1 stop11h 52m

Denver Intl

Tue 27/5

10:29 p.m.-7:59 p.m.

1 stop19h 30m

C$ 491

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Mon 28/4

8:55 p.m.-9:09 a.m.

1 stop14h 14m

Denver Intl

Thu 1/5

3:42 p.m.-12:22 p.m.

1 stop18h 40m

C$ 509

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Tue 17/6

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

1 stop18h 12m

Denver Intl

Mon 23/6

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

1 stop10h 26m

C$ 546

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Tue 22/4

8:35 a.m.-10:20 a.m.

Nonstop3h 45m

Denver Intl

Sat 26/4

11:15 a.m.-4:26 p.m.

Nonstop3h 11m

C$ 549

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Sun 11/5

9:25 a.m.-11:27 a.m.

2 stops28h 02m

Denver Intl

Sat 17/5

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

1 stop10h 31m

C$ 550

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Tue 22/4

6:10 p.m.-11:40 p.m.

1 stop7h 30m

Denver Intl

Tue 29/4

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

1 stop7h 29m

C$ 564

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Fri 2/5

12:25 p.m.-6:20 p.m.

1 stop7h 55m

Denver Intl

Sun 11/5

9:40 a.m.-7:50 p.m.

1 stop8h 10m

C$ 607

Flights are sorted by cheapest round-trip flights first.

Deals found on 24/3

Showing 1-10 of 26 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 21 March 2025.

Booking 47 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 19 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 (6 on average). You will have fewer flight options on Monday, 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$ 356

United Airlines

United Airlines

From C$ 377

WestJet

WestJet

From C$ 285

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 25 March 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
9,785 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,785 reviews
Alaska Airlines
8.0
Very good
9,785 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,890 reviews
Alaska Airlines
8.0
Very good
9,785 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,605 reviews
Alaska Airlines
8.0
Very good
9,785 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,785 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
WestJet
7.2
Good
2,785 reviews
Alaska Airlines
8.0
Very good
9,785 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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$ 251, however they can be found for as little as C$ 38.

  • 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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