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Key Largo

$69+ Cheap flights from O'Hare Intl (ORD) to Key Largo, FL

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 9/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — MIA
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago O'Hare Intl to Key Largo are usually found in September or August, booked 83 days in advance, depart on a Thursday or Tuesday and return on a Wednesday

Cheap flight deals from O'Hare Intl to Key Largo

Keep the following information in mind while searching for O'Hare Intl to Key Largo flight deals. Data was last updated July 3, 2025.

Round-trip from

$129
(Booking.com)

One-way from

$69
(American Airlines)

Popular in

March

Cheapest in

September

Average price

$221
From Chicago O'Hare Intl to Key Largo
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One-way flight from Chicago O'Hare Intl to Key Largo
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Highest demand for flights based on searches. 13% potential increase in price ($42 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from O'Hare Intl to Key Largo

Cheapest flights from O'Hare Intl to Key Largo
Explore the most affordable flight options available from O'Hare Intl to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

This Booking.com deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1610:27 amORD - MIA
Nonstop3h 22mSpirit Airlines
Sat 8/237:00 amMIA - ORD
Nonstop3h 22mSpirit Airlines
Deal found 7/2$129
This FlightHub deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2211:44 amORD - MIA
1 stop17h 46mMultiple Airlines
Tue 8/267:00 amMIA - ORD
Nonstop3h 22mMultiple Airlines
Deal found 7/2$134
This American Airlines deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/307:05 pmORD - MIA
Nonstop3h 19mAmerican Airlines
Fri 9/123:50 pmMIA - ORD
Nonstop3h 23mAmerican Airlines
Deal found 7/2$137
This Priceline deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/315:01 amORD - MIA
1 stop5h 13mFrontier
Sun 8/33:00 pmMIA - ORD
1 stop10h 22mFrontier
Deal found 7/2$142
This United Airlines deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/107:01 amORD - MIA
Nonstop3h 17mUnited Airlines
Wed 8/1312:20 pmMIA - ORD
Nonstop3h 35mUnited Airlines
Deal found 7/2$153
This Southwest deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/247:30 amORD - MIA
1 stop7h 35mSouthwest
Wed 8/276:55 amMIA - ORD
1 stop7h 10mSouthwest
Deal found 7/3$157

Cheapflights Fare Finder

Customize your flight search to find flights from O'Hare Intl to Key Largo 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 2,558,603 searches. Data last updated July 3, 2025.
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to Key Largo that are best for you.

Fly from

O'Hare Intl

Fly to

Key Largo

Route

Depart

Return

Price

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Sat 8/16

10:27 am-2:49 pm

Nonstop3h 22m

Miami

Sat 8/23

7:00 am-9:22 am

Nonstop3h 22m

$129

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Fri 8/22

11:44 am-6:30 am

1 stop17h 46m

Miami

Tue 8/26

7:00 am-9:22 am

Nonstop3h 22m

$134

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Sat 8/30

7:05 pm-11:24 pm

Nonstop3h 19m

Miami

Fri 9/12

3:50 pm-6:13 pm

Nonstop3h 23m

$137

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Thu 7/31

5:01 am-11:14 am

1 stop5h 13m

Miami

Sun 8/3

3:00 pm-12:22 am

1 stop10h 22m

$142

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Sun 8/10

7:01 am-11:18 am

Nonstop3h 17m

Miami

Wed 8/13

12:20 pm-2:55 pm

Nonstop3h 35m

$153

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Sun 8/24

7:30 am-4:05 pm

1 stop7h 35m

Miami

Wed 8/27

6:55 am-1:05 pm

1 stop7h 10m

$157

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Sun 9/7

5:00 am-9:04 am

Nonstop3h 04m

$69

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Sun 7/27

8:09 am-12:23 pm

Nonstop3h 14m

$72

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Sun 9/7

8:50 am-11:27 pm

1 stop13h 37m

$73

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Mon 9/1

6:00 am-11:50 am

1 stop4h 50m

$79

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

Showing 1-10 of 11 results
1
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Best time to book a flight from O'Hare Intl to Key Largo

Have a flexible travel schedule? Discover the best time to fly to Key Largo from O'Hare Intl 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 from Chicago O'Hare Intl Airport to Key Largo

How far ahead should I book a flight from Chicago O'Hare Intl Airport to Key Largo?

Use this chart to determine the optimal time to book a round-trip flight from O'Hare Intl to Key Largo. Price data was last updated on June 27, 2025.

To ensure you get the cheapest price possible for a flight from Chicago O'Hare Intl Airport to Key Largo, you should look to book at least 83 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to Key Largo?

Currently, September is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Key Largo (average of $231). Flying from Chicago O'Hare Intl Airport to Key Largo in March is currently the most expensive (average of $289). 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.

What is the cheapest time of day to fly from ORD to KE9?

Find hourly flight availability from O'Hare Intl to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 3, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Chicago O'Hare Intl Airport to Key Largo as you normally would.

What is the cheapest day to fly from Chicago O'Hare Intl Airport to Key Largo?

Use this chart to determine the cheapest time to fly round-trip from O'Hare Intl to Key Largo. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Chicago O'Hare Intl Airport to Key Largo flight should consider departing on Sunday evenings when fares are most often at their lowest. Tuesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Chicago O'Hare Intl Airport to Key Largo

Explore weekly flight availability from O'Hare Intl to Key Largo. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 3, 2025.

The most flights from ORD to KE9 are scheduled on a Thursday (43 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (13 on average).

How much does it cost to fly round-trip from Chicago O'Hare Intl Airport to Key Largo?

Reviews of airlines servicing Key Largo

Get insights into the airlines that provide service to Key Largo. 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 Key Largo. Reviews last updated July 3, 2025.
See what other customers who have flown with Southwest, United Airlines, and American Airlines from Chicago O'Hare Intl Airport to Key Largo have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,270 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.2

Food

7.0

Reviews

1 / 20
10.0
Excellent

Sarah,Aug 2024

MDW - AUS

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.
Southwest
8.0
Very good
4,270 reviews
Southwest
8.0
Very good
4,270 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.2

Food

7.0

Reviews

1 / 20
10.0
Excellent

Sarah,Aug 2024

MDW - AUS

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.
United Airlines
7.4
Good
8,845 reviews
Southwest
8.0
Very good
4,270 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.2

Food

7.0

Reviews

1 / 20
10.0
Excellent

Sarah,Aug 2024

MDW - AUS

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,270 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.2

Food

7.0

Reviews

1 / 20
10.0
Excellent

Sarah,Aug 2024

MDW - AUS

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.
Spirit Airlines
6.3
Okay
8,094 reviews
Southwest
8.0
Very good
4,270 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.2

Food

7.0

Reviews

1 / 20
10.0
Excellent

Sarah,Aug 2024

MDW - AUS

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.
Frontier
5.9
Fair
3,284 reviews
Southwest
8.0
Very good
4,270 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.2

Food

7.0

Reviews

1 / 20
10.0
Excellent

Sarah,Aug 2024

MDW - AUS

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.

Related info for your journey

Find useful and relevant information for your journey from O'Hare Intl to Key Largo. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines to fly from Chicago O'Hare Intl Airport to Key Largo one-way?

    To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $69. Frontier flights start at $71 while deals on Spirit Airlines start at $72 one-way.

  • What are the most reliable airlines from Chicago O'Hare Intl Airport to Key Largo?

    The top 3 most reliable airlines when flying from Chicago O'Hare Intl Airport to Key Largo are Air Canada (87%), Copa Airlines (87%) and Air New Zealand (87%).

  • What are the cheapest flights from Chicago O'Hare Intl Airport to Key Largo?

    While on average a flight from Chicago O'Hare Intl Airport to Key Largo is generally $684, our data shows the cheapest flight currently is $71. When looking at the most popular route, (Chicago O'Hare Intl - Miami), you can expect to pay $87 for that flight.

  • Can I find deals for flights from O'Hare Intl to Key Largo that include hotel bookings?

    Yes. In addition to deals on O'Hare Intl to Key Largo flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from O'Hare Intl to Key Largo?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from O'Hare Intl to Key Largo.

  • Can I find deals for business class flights from O'Hare Intl to Key Largo?

    Yes. Cheapflights offers flight deals from O'Hare Intl to Key Largo by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to Key Largo?

    Currently, September is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Key Largo (average of $231). Flying from Chicago O'Hare Intl Airport to Key Largo in March is currently the most expensive (average of $289). 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.

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Top 7 airlines flying from O'Hare Intl to Key Largo

Discover the top 7 airlines that operate flights from O'Hare Intl to Key Largo. 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 2,558,603 searches. Data last updated July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$58Average$144FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$80Average$196FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$161Average$366FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$176Average$215FlexibilityNo cancel feeOn-time75%
DeltaCheapest$177Average$339FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$177Average$414FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$235Average$368FlexibilityNo cancel feeOn-time63%

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