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Cheap flights from Illinois to Denver (DEN) from $37

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 9/30. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ORD — DEN
Jun 9 — Jun 161
From?
To?
Sun 6/9
Sun 6/16
1 adult, Economy
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How far in advance should I book a flight from Illinois to Denver?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 29 days in advance, which can save you up to 35% on flights from Illinois to Denver compared to booking the week you need them. Waiting 29 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $171. For sooner than that we have options available in the next 3 days from $317.

What is the cheapest month to fly from Illinois to Denver?

April can be a great time to fly to Denver from Illinois with a flight ticket averaging about $191. Cheapflights users have found deals in the month of April for as cheap as $39. The most expensive prices can be found in the month of July.

What is the cheapest time of day to fly from IL to DEN?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Denver as you normally would.

Cheap Frontier flights from Illinois to Denver

Explore cheap flight options specifically provided by Frontier for the route between Illinois and Denver. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 3,009,960 searches. Data last updated June 4, 2024.
Take a peek at the cheapest Frontier flights we've detected traveling from Illinois to Denver. Make sure to check back often as deals are often changing.
Tue 6/116:00 amMDW - DEN
Nonstop2h 44mFrontier
Thu 6/137:44 amDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/3$55
Tue 6/115:13 pmBMI - DEN
Nonstop2h 34mFrontier
Thu 6/131:39 pmDEN - BMI
Nonstop2h 13mFrontier
Deal found 6/3$58
Tue 6/186:00 amMDW - DEN
Nonstop2h 44mFrontier
Tue 6/259:45 amDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/3$60
Tue 6/115:13 pmBMI - DEN
Nonstop2h 34mFrontier
Tue 6/181:08 pmDEN - BMI
Nonstop2h 13mFrontier
Deal found 6/4$61
Thu 8/228:00 amORD - DEN
Nonstop2h 45mFrontier
Sat 8/248:40 pmDEN - ORD
Nonstop2h 31mFrontier
Deal found 6/3$62
Tue 6/116:00 amMDW - DEN
Nonstop2h 44mFrontier
Tue 6/181:46 pmDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/4$64
Wed 8/286:00 amMDW - DEN
Nonstop2h 43mFrontier
Wed 9/48:30 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 6/3$65
Sat 6/155:40 amMDW - DEN
Nonstop2h 46mFrontier
Tue 6/181:46 pmDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/3$66
Tue 7/23:47 pmSTL - DEN
Nonstop2h 29mFrontier
Tue 7/911:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 6/2$67

Cheap United Airlines flights from Illinois to Denver

Explore cheap flight options specifically provided by United Airlines for the route between Illinois and Denver. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 3,009,960 searches. Data last updated June 4, 2024.
Have a look at some of the cheapest available United Airlines flights departing from Illinois and landing in Denver. Deals are refreshing constantly so come back soon for more options.
Mon 8/1912:45 pmORD - DEN
Nonstop2h 42mUnited Airlines
Mon 8/195:27 pmDEN - ORD
Nonstop2h 34mUnited Airlines
Deal found 6/3$114
Thu 8/155:30 pmSTL - DEN
1 stop6h 22mUnited Airlines
Mon 8/196:03 amDEN - STL
1 stop5h 19mUnited Airlines
Deal found 6/3$192
Wed 11/279:45 pmORD - DEN
Nonstop2h 33mUnited Airlines
Sat 11/308:34 pmDEN - ORD
Nonstop2h 32mUnited Airlines
Deal found 6/4$225
Sun 6/95:04 amORD - DEN
Nonstop2h 38mUnited Airlines
Tue 6/116:00 amDEN - ORD
Nonstop2h 35mUnited Airlines
Deal found 6/2$300
Wed 6/129:05 amSTL - DEN
Nonstop2h 24mUnited Airlines
Wed 6/191:25 pmDEN - STL
Nonstop2h 04mUnited Airlines
Deal found 6/3$307
Sun 6/95:04 amORD - DEN
Nonstop2h 38mUnited Airlines
Tue 6/115:25 pmDEN - ORD
1 stop5h 48mUnited Airlines
Deal found 6/2$329
Tue 6/119:05 amSTL - DEN
Nonstop2h 24mUnited Airlines
Tue 6/113:40 pmDEN - STL
1 stop5h 35mUnited Airlines
Deal found 6/3$377
Thu 6/139:00 amMLI - DEN
Nonstop2h 27mUnited Airlines
Tue 6/1811:20 amDEN - MLI
1 stop4h 37mUnited Airlines
Deal found 6/4$414
Fri 6/149:05 amSTL - DEN
Nonstop2h 24mUnited Airlines
Fri 6/145:40 pmDEN - STL
Nonstop2h 09mUnited Airlines
Deal found 6/3$442

Cheap Illinois to Denver flights in June & July 2024

Find cheap flight options from Illinois to Denver specifically for the months of June and July 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,009,960 searches. Prices were last updated on June 4, 2024.
The lowest fares we've come across on flights traveling from Illinois to Denver in June and July 2024. Check back in a little while for more flight options.
Tue 6/115:13 pmBMI - DEN
Nonstop2h 34mFrontier
Thu 6/131:39 pmDEN - BMI
Nonstop2h 13mFrontier
Deal found 6/3$58
Thu 6/133:32 pmSTL - DEN
Nonstop2h 29mFrontier
Sat 6/156:20 amDEN - STL
Nonstop2h 09mFrontier
Deal found 6/3$58
Tue 7/26:00 amMDW - DEN
Nonstop2h 44mFrontier
Tue 7/95:26 pmDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/3$58
Tue 6/186:00 amMDW - DEN
Nonstop2h 44mFrontier
Tue 6/259:45 amDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/3$60
Tue 6/115:13 pmBMI - DEN
Nonstop2h 34mFrontier
Tue 6/181:08 pmDEN - BMI
Nonstop2h 13mFrontier
Deal found 6/4$61
Tue 6/113:47 pmSTL - DEN
Nonstop2h 29mFrontier
Sat 8/246:26 amDEN - STL
Nonstop2h 11mFrontier
Deal found 6/2$61
Sat 6/155:40 amMDW - DEN
Nonstop2h 46mFrontier
Tue 6/181:46 pmDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/3$66
Tue 6/186:00 amORD - DEN
Nonstop2h 45mFrontier
Tue 6/189:10 pmDEN - ORD
Nonstop2h 30mFrontier
Deal found 6/4$67
Tue 7/23:47 pmSTL - DEN
Nonstop2h 29mFrontier
Tue 7/911:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 6/2$67

Illinois to Denver 2024 flight deals

Discover exclusive flight deals for travel between Illinois and Denver in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,009,960 searches. Data last updated June 4, 2024.
The lowest fares we've come across on flights traveling from Illinois to Denver in June and July 2024. Check back in a little while for more flight options.
Tue 6/116:00 amMDW - DEN
Nonstop2h 44mFrontier
Thu 6/137:44 amDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/3$55
Tue 6/186:00 amORD - DEN
Nonstop2h 45mFrontier
Tue 6/259:10 pmDEN - ORD
Nonstop2h 30mFrontier
Deal found 6/4$57
Tue 6/115:13 pmBMI - DEN
Nonstop2h 34mFrontier
Thu 6/131:39 pmDEN - BMI
Nonstop2h 13mFrontier
Deal found 6/3$58
Tue 7/26:00 amORD - DEN
Nonstop2h 45mFrontier
Tue 7/99:00 pmDEN - ORD
Nonstop2h 35mFrontier
Deal found 6/3$58
Thu 6/133:32 pmSTL - DEN
Nonstop2h 29mFrontier
Sat 6/156:20 amDEN - STL
Nonstop2h 09mFrontier
Deal found 6/3$58
Tue 7/26:00 amMDW - DEN
Nonstop2h 44mFrontier
Tue 7/95:26 pmDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/3$58
Tue 9/108:00 amORD - DEN
Nonstop2h 45mFrontier
Thu 9/124:43 pmDEN - ORD
Nonstop2h 38mFrontier
Deal found 6/4$59
Sat 9/76:00 amMDW - DEN
Nonstop2h 43mFrontier
Sat 9/148:30 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 6/4$59
Wed 6/129:53 pmORD - DEN
Nonstop2h 57mFrontier
Wed 6/195:13 pmDEN - ORD
Nonstop2h 35mFrontier
Deal found 6/3$60

Non-stop flights to Denver from Illinois

Discover non-stop flight options from Illinois to Denver. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 3,009,960 searches. Data last updated June 4, 2024.
If you're seeking options on non-stop flights from Illinois to Denver, check out these fares. Users seeking other options on flights from Illinois to Denver should update the search form at the top of the page.
Tue 6/183:47 pmSTL - DEN
Nonstop2h 29mFrontier
Wed 6/196:20 amDEN - STL
Nonstop2h 09mFrontier
Deal found 6/4$57
Wed 8/78:02 pmSTL - DEN
Nonstop2h 23mFrontier
Tue 8/138:44 amDEN - STL
Nonstop2h 06mFrontier
Deal found 6/3$58
Tue 7/26:00 amMDW - DEN
Nonstop2h 44mFrontier
Tue 7/95:26 pmDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/3$58
Sat 9/76:00 amMDW - DEN
Nonstop2h 43mFrontier
Sat 9/148:30 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 6/4$59
Tue 6/186:00 amMDW - DEN
Nonstop2h 44mFrontier
Tue 6/259:45 amDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/3$60
Thu 8/226:00 amMDW - DEN
Nonstop2h 43mFrontier
Sat 8/248:30 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 6/3$62
Wed 8/286:00 amMDW - DEN
Nonstop2h 43mFrontier
Wed 9/48:30 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 6/3$65
Wed 8/76:15 amMDW - DEN
Nonstop2h 41mFrontier
Wed 8/148:30 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 6/3$66
Tue 7/23:47 pmSTL - DEN
Nonstop2h 29mFrontier
Tue 7/911:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 6/2$67

Illinois to Denver flights leaving soon

Find last-minute flight options from Illinois to Denver for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 3,009,960 searches. Data last updated June 4, 2024.
Check out these flights departing soon from Illinois to Denver. Tip: verify your flight details before completing your reservation.
Tue 6/116:00 amMDW - DEN
Nonstop2h 44mFrontier
Thu 6/137:44 amDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/3$55
Tue 6/115:13 pmBMI - DEN
Nonstop2h 34mFrontier
Thu 6/131:39 pmDEN - BMI
Nonstop2h 13mFrontier
Deal found 6/3$58
Thu 6/133:32 pmSTL - DEN
Nonstop2h 29mFrontier
Sat 6/156:20 amDEN - STL
Nonstop2h 09mFrontier
Deal found 6/3$58
Tue 6/186:00 amMDW - DEN
Nonstop2h 44mFrontier
Tue 6/259:45 amDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/4$58
Tue 6/186:00 amMDW - DEN
Nonstop2h 44mFrontier
Tue 6/259:45 amDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/3$60
Tue 6/115:13 pmBMI - DEN
Nonstop2h 34mFrontier
Tue 6/181:08 pmDEN - BMI
Nonstop2h 13mFrontier
Deal found 6/4$61
Tue 6/113:47 pmSTL - DEN
Nonstop2h 29mFrontier
Sat 8/246:26 amDEN - STL
Nonstop2h 11mFrontier
Deal found 6/2$61
Tue 6/116:00 amMDW - DEN
Nonstop2h 44mFrontier
Tue 6/181:46 pmDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/4$64
Sat 6/155:40 amMDW - DEN
Nonstop2h 46mFrontier
Tue 6/181:46 pmDEN - MDW
Nonstop2h 24mFrontier
Deal found 6/3$66

One-way flights to Denver from Illinois

Search for one-way flight options from Illinois to Denver. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 3,009,960 searches. Data last updated June 4, 2024.
If you're seeking multiple options on one-way flights from Illinois to Denver, be sure to check out these deals, which are updated often. Those seeking round-trip flights from Illinois to Denver should utilize the search form at the the top of the page.
Mon 9/306:48 pmORD - DEN
Nonstop2h 44mFrontier
Deal found 6/3$37
Wed 9/46:00 amMDW - DEN
Nonstop2h 43mFrontier
Deal found 6/3$37
Wed 7/35:55 amMDW - DEN
Nonstop2h 46mFrontier
Deal found 6/3$38
Tue 9/38:00 amORD - DEN
Nonstop2h 45mFrontier
Deal found 6/3$39
Tue 9/310:32 pmSTL - DEN
Nonstop2h 29mFrontier
Deal found 6/3$39
Wed 7/35:55 amMDW - DEN
Nonstop2h 46mFrontier
Deal found 6/3$39
Sat 8/175:56 pmORD - DEN
Nonstop2h 39mFrontier
Deal found 6/3$40
Sat 8/176:00 amMDW - DEN
Nonstop2h 43mFrontier
Deal found 6/3$40
Wed 7/39:53 pmORD - DEN
Nonstop2h 57mFrontier
Deal found 6/3$41

Find flights from Illinois to Denver within your budget

Customize your flight search to find flights from Illinois to Denver that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 3,009,960 searches. Data last updated June 4, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$62 - $148

Route

Depart

Return

Price

Chicago O'Hare IntlDenver Intl

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Thu 8/22

Nonstop2h 45m

Denver Intl

Sat 8/24

Nonstop2h 31m

$62

Chicago MidwayDenver Intl

MDW - DEN

MDWDEN

Chicago Midway

Thu 8/22

Nonstop2h 43m

Denver Intl

Sat 8/24

Nonstop2h 22m

$62

Chicago MidwayDenver Intl

MDW - DEN

MDWDEN

Chicago Midway

Wed 8/28

Nonstop2h 43m

Denver Intl

Wed 9/4

Nonstop2h 22m

$65

Chicago MidwayDenver Intl

MDW - DEN

MDWDEN

Chicago Midway

Wed 8/7

Nonstop2h 41m

Denver Intl

Wed 8/14

Nonstop2h 22m

$66

Lambert-St LouisDenver Intl

STL - DEN

STLDEN

Lambert-St Louis

Tue 7/2

Nonstop2h 29m

Denver Intl

Tue 7/9

Nonstop2h 06m

$67

Chicago O'Hare IntlDenver Intl

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Wed 6/19

Nonstop2h 57m

Denver Intl

Thu 6/27

1 stop8h 41m

$102

Chicago O'Hare IntlDenver Intl

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Mon 8/19

Nonstop2h 42m

Denver Intl

Mon 8/19

Nonstop2h 34m

$114

Greater PeoriaDenver Intl

PIA - DEN

PIADEN

Greater Peoria

Mon 7/1

Nonstop2h 19m

Denver Intl

Mon 7/8

Nonstop2h 00m

$132

Moline Quad-CityDenver Intl

MLI - DEN

MLIDEN

Moline Quad-City

Tue 7/2

1 stop6h 43m

Denver Intl

Mon 7/8

1 stop4h 57m

$148

Flights are sorted by cheapest first

Deals found on 6/3

No data available for this route at this time. Please check back soon.

Best time to book a flight from Illinois to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Illinois 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.

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. 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 Denver. Reviews last updated June 4, 2024.
Get a feel of what it's like to fly with Frontier, United Airlines and Allegiant Air from Illinois to Denver by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.1
Very good
9,214 reviews
Check prices

Food

7.3

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Crew

8.6

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

Alaska Airlines
8.1
Very good
9,214 reviews
Alaska Airlines
8.1
Very good
9,214 reviews
Check prices

Food

7.3

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Crew

8.6

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

Delta
8.0
Very good
10,377 reviews
Alaska Airlines
8.1
Very good
9,214 reviews
Check prices

Food

7.3

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Crew

8.6

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

WestJet
7.5
Good
2,861 reviews
Alaska Airlines
8.1
Very good
9,214 reviews
Check prices

Food

7.3

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Crew

8.6

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

Allegiant Air
7.5
Good
997 reviews
Alaska Airlines
8.1
Very good
9,214 reviews
Check prices

Food

7.3

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Crew

8.6

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

United Airlines
7.4
Good
10,732 reviews
Alaska Airlines
8.1
Very good
9,214 reviews
Check prices

Food

7.3

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Crew

8.6

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Denver. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Denver from Illinois?

    For a flight from Illinois to Denver, you will be flying into Denver Intl. Denver Intl (DEN) is just 18.5 mi from the center of the city.

  • Can I find flights from Illinois to Denver for under $100 on Cheapflights?

    Yes, there are multiple flights from Illinois to Denver for under $100. The cheapest flight booked recently is on Frontier for just $62, but on average you can expect to pay $70.

  • Are there nonstop flights from Illinois to Denver for under $100 on Cheapflights?

    Cheapflights has at least 20 direct flights from Illinois to Denver under $100. A good price for a nonstop flight from Illinois to Denver is less than $66.

  • Are there last-minute flights available from Illinois to Denver for under $100?

    There are currently 20+ open flights from Illinois to Denver within the next 7 days for less than $100.

  • What days are nonstop flights available from Illinois to Denver?

    Nonstop flights are available for this route on the following days: Sunday, Tuesday, Wednesday, Thursday, Friday, Saturday.

  • How many flights depart from Illinois to Denver on average per day?

    On average 23 flights depart from Illinois to Denver per day.
    Early Morning (Midnight to 6am) - 9% of flight departures
    Afternoon (Noon - 6pm) - 43% of flight departures
    Evening (6pm - Midnight) - 48% of flight departures

  • How long is the flight from Illinois to Denver?

    Airlines like Frontier fly from Illinois to Denver in about 2h 45m. The time it takes to get you to your destination is usually consistent. Airlines will cover a distance of 891 mi. All flights are typically nonstop.

  • What are the most popular routes from Illinois to Denver?

    While some choose either Lambert-St Louis - Denver Intl or Chicago Midway - Denver Intl, Chicago O'Hare Intl - Denver Intl is the most popular route from Illinois to Denver.

  • What are the most reliable airlines from Illinois to Denver?

    The top 3 most reliable airlines when flying from Illinois to Denver are Cathay Pacific (100%), Scandinavian Airlines (85%) and Southwest (82%).

  • What are the cheapest flights from Illinois to Denver?

    While on average a flight from Illinois to Denver is generally $521, our data shows the cheapest flight currently is $39. When looking at the most popular route, (Chicago O'Hare Intl - Denver Intl), you can expect to pay $86 for that flight.

  • What does ORD to DEN mean?

    These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Chicago O'Hare Intl Airport to Denver Intl Airport flight would often be abbreviated as a ORD to DEN flight. While you’re still figuring out your travel plans, it’s not a bad idea to learn the names and codes of other airports around these areas: Chicago Midway Airport (MDW), Moline Quad-City Airport (MLI), Greater Peoria Airport (PIA), Bloomington-Normal Airport (BMI), Springfield Capital Airport (SPI).

  • Can I find deals for flights from Illinois to Denver that include extra baggage allowance?

    The amount of baggage you can bring on your Illinois to Denver flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Illinois to Denver with specific airlines?

    Yes, Cheapflights allows you to browse and filter Illinois to Denver flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Illinois to Denver that include hotel bookings?

    Yes. In addition to deals on Illinois to Denver flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Denver?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Denver.

  • Can I find deals for business class flights from Illinois to Denver?

    Yes. Cheapflights offers flight deals from Illinois to Denver by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Illinois to Denver that allow pets onboard?

    Many airlines flying from Illinois to Denver offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Illinois to Denver?

    Yes, you can often find last-minute deals on Illinois to Denver flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Illinois to Denver flight deals updated?

    The Illinois to Denver flight deals you see on this page were last updated on 6/4.

  • What are the most popular airlines that fly from Illinois to Denver?

    When booking a flight from Illinois to Denver, you may want to consider flying on American Airlines, Delta or Frontier as they are the most popular for this route.

  • What is the cheapest month to book a flight from Illinois to Denver?

    Currently, December is the cheapest month in which you can book a flight from Illinois to Denver (average of $191). Flying from Illinois to Denver in March is currently the most expensive (average of $269). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 7 airlines flying from Illinois to Denver

Discover the top 7 airlines that operate flights from Illinois to Denver. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 3,009,960 searches. Data last updated June 4, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$36Average$123FlexibilityNo cancel feeOn-time62%
Search Frontier flights
Allegiant AirCheapest$94Average$180FlexibilityNo cancel feeOn-time88%
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Spirit AirlinesCheapest$96Average$165FlexibilityNo cancel feeOn-time65%
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United AirlinesCheapest$100Average$338FlexibilityNo cancel feeOn-time69%
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American AirlinesCheapest$109Average$418FlexibilityNo cancel feeOn-time71%
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Denver Air ConnectionCheapest$144Average$247FlexibilityNo cancel feeOn-timeN/A
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DeltaCheapest$195Average$382FlexibilityNo cancel feeOn-timeN/A
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Search flights from Illinois to Denver by cabin class

Find flights from Illinois to Denver, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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Hourly flight availability from Illinois to Denver

Find hourly flight availability from Illinois to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 4, 2024.
6%of flight departuresEarly morningMidnight to 6 am
32%of flight departuresMorning6 am to noon
39%of flight departuresAfternoonNoon to 6 pm
23%of flight departuresEvening6 pm to midnight
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How does Cheapflights help users find flights from Illinois to Denver?

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Why should you use Cheapflights to find cheap flight tickets from Illinois to Denver?

Cheapflights simply makes it quick and affordable to book flights from Illinois to Denver by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Illinois to Denver with no change fees?

Yes, we can. To see specific flights from Illinois to Denver with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Illinois to Denver become cheaper?

Yes, Cheapflights offers price alerts on Illinois to Denver flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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