What are the cheapest airlines to fly from Chicago to Port St. Lucie one-way?

To fly one-way, consider booking your trip with Allegiant Air, which is currently one of the cheapest options available, starting at $28. Frontier flights start at $29 while deals on American Airlines start at $69 one-way.

Weekly flight availability from Chicago to Port St. Lucie

The most flights from CHI to LU5 are scheduled on a Wednesday (74 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (39 on average).

In terms of precipitation, rainfall in Port St. Lucie ranges from 1.8 - 8.3 inches per month. September is typically the wettest month, when rainfall can reach 8.3 in. February is typically the driest time to visit Port St. Lucie when rainfall is around 1.8 in.

If weather is an important factor for your trip to Port St. Lucie, 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 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 66.2 F).

What are the cheapest flights from Chicago to Port St. Lucie?

The cheapest flight price from Chicago to Port St. Lucie is $109. On average you can expect to pay $573. The most popular route, (Chicago O'Hare Intl - Fort Lauderdale), can usually be booked for $80.

What are the most reliable airlines from Chicago to Port St. Lucie?

No one likes to see their flight delayed. When booking a flight from Chicago to Port St. Lucie consider choosing Sun Country Air (100%), Copa Airlines (86%) or Azul (77%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from Chicago to Port St. Lucie?

United Airlines, Frontier and American Airlines are the most popular airlines when flying from Chicago to Port St. Lucie.

Can I find deals for flights from Chicago to Port St. Lucie that include hotel bookings?

Yes. In addition to deals on Chicago to Port St. Lucie flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Chicago to Port St. Lucie?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to Port St. Lucie.

Can I find deals for business class flights from Chicago to Port St. Lucie?

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

Find Cheap Flights from Chicago to Port St. Lucie

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Cheapflights Tip: The best prices from Chicago to Port St. Lucie are usually found in September or October, booked 43 days in advance, depart on a Thursday or Tuesday and return on a Thursday

Find flight deals from Chicago to Port St. Lucie

Most accurate provider	FlightHub 3 stars
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Popular in	June
Cheapest in	September
Average price	$199

Provider with most accurate pricing for Chicago (CHI)-Fort Lauderdale flight deals.

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Highest demand for flights based on searches. 12% potential increase in price ($35 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($8 potential savings vs. average RT price).

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Average for round-trip flights in October 2026

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Cheapflights Insights

Everything you need to know about your flight from Chicago to Port St. Lucie

Prices

Airlines

What is the cheapest time of day to fly from CHI to LU5?

Unlike at noon, when flights are generally more expensive, you can save up to 10% on flights from Chicago to Port St. Lucie by exploring options for tickets in the morning.

What is the cheapest day to fly from Chicago to Port St. Lucie?

Travelers seeking maximum savings on their Chicago to Port St. Lucie flight should consider departing on Wednesday mornings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Port St. Lucie

Get a feel of what it's like to fly with Southwest,United Airlines, andJetBlue from Chicago to Port St. Lucie by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

7.9

Good

4,219 reviews

Reviews

1 / 20

8.0

Excellent

Patricia,Oct 2026

DAL - TPA

I love flying southwest, Both flights were packed full full - so not room for all carry one and bags had to be checked but still good flights.

Southwest

7.9

Good

4,219 reviews

Southwest

7.9

Good

4,219 reviews

Reviews

1 / 20

8.0

Excellent

Patricia,Oct 2026

DAL - TPA

I love flying southwest, Both flights were packed full full - so not room for all carry one and bags had to be checked but still good flights.

United Airlines

7.4

Good

10,375 reviews

Southwest

7.9

Good

4,219 reviews

Reviews

1 / 20

8.0

Excellent

Patricia,Oct 2026

DAL - TPA

I love flying southwest, Both flights were packed full full - so not room for all carry one and bags had to be checked but still good flights.

JetBlue

7.1

Good

3,057 reviews

Southwest

7.9

Good

4,219 reviews

Reviews

1 / 20

8.0

Excellent

Patricia,Oct 2026

DAL - TPA

I love flying southwest, Both flights were packed full full - so not room for all carry one and bags had to be checked but still good flights.

American Airlines

7.0

Good

12,165 reviews

Southwest

7.9

Good

4,219 reviews

Reviews

1 / 20

8.0

Excellent

Patricia,Oct 2026

DAL - TPA

I love flying southwest, Both flights were packed full full - so not room for all carry one and bags had to be checked but still good flights.

Frontier

5.5

Fair

2,537 reviews

Southwest

7.9

Good

4,219 reviews

Reviews

1 / 20

8.0

Excellent

Patricia,Oct 2026

DAL - TPA

I love flying southwest, Both flights were packed full full - so not room for all carry one and bags had to be checked but still good flights.

Related info for your journey

What are the cheapest airlines to fly from Chicago to Port St. Lucie one-way?
To fly one-way, consider booking your trip with Allegiant Air, which is currently one of the cheapest options available, starting at $28. Frontier flights start at $29 while deals on American Airlines start at $69 one-way.
What are the most reliable airlines from Chicago to Port St. Lucie?
No one likes to see their flight delayed. When booking a flight from Chicago to Port St. Lucie consider choosing Sun Country Air (100%), Copa Airlines (86%) or Azul (77%) as they are the most reliable in getting you off to your destination on time.
What are the cheapest flights from Chicago to Port St. Lucie?
The cheapest flight price from Chicago to Port St. Lucie is $109. On average you can expect to pay $573. The most popular route, (Chicago O'Hare Intl - Fort Lauderdale), can usually be booked for $80.
Can I find deals for flights from Chicago to Port St. Lucie that include hotel bookings?
Yes. In addition to deals on Chicago to Port St. Lucie flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Chicago to Port St. Lucie?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to Port St. Lucie.
Can I find deals for business class flights from Chicago to Port St. Lucie?
Yes. Cheapflights offers flight deals from Chicago to Port St. Lucie by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Top 7 airlines flying from Chicago to Port St. Lucie

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$58	Average$236	FlexibilityNo cancel fee	On-time62%
Allegiant Air	Cheapest$81	Average$181	FlexibilityNo cancel fee	On-time88%
Delta	Cheapest$111	Average$297	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$157	Average$354	FlexibilityNo cancel fee	On-time71%
JetBlue	Cheapest$159	Average$252	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$163	Average$367	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$168	Average$369	FlexibilityNo cancel fee	On-time63%

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Cheap flights from Chicago (CHI) to Port St. Lucie, FL

Find cheap flights from Chicago to Port St. Lucie with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Find flight deals from Chicago to Port St. Lucie

Most accurate provider

Most trusted provider

Popular in

Cheapest in

Average price

Cheapflights Insights

What is the cheapest time of day to fly from CHI to LU5?

Unlike at noon, when flights are generally more expensive, you can save up to 10% on flights from Chicago to Port St. Lucie by exploring options for tickets in the morning.

What is the cheapest day to fly from Chicago to Port St. Lucie?

Travelers seeking maximum savings on their Chicago to Port St. Lucie flight should consider departing on Wednesday mornings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Chicago to Port St. Lucie

The most flights from CHI to LU5 are scheduled on a Wednesday (74 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (39 on average).

Reviews of airlines servicing Port St. Lucie

Get a feel of what it's like to fly with Southwest,United Airlines, andJetBlue from Chicago to Port St. Lucie by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

What are the cheapest airlines to fly from Chicago to Port St. Lucie one-way?

What are the most reliable airlines from Chicago to Port St. Lucie?

What are the cheapest flights from Chicago to Port St. Lucie?

Can I find deals for flights from Chicago to Port St. Lucie that include hotel bookings?

How can I find direct flights from Chicago to Port St. Lucie?

Can I find deals for business class flights from Chicago to Port St. Lucie?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Chicago to Port St. Lucie

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Port St. Lucie by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Chicago to Port St. Lucie by cabin class

Find flights from Chicago to Port St. Lucie, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Chicago and Port St. Lucie flights

Browse other Chicago and Port St. Lucie flight options. Last updated on October 16, 2026.

Other flights from Chicago

Browse through other flights departing from Chicago. Flights are based on user searches made on Cheapflights and were last updated on October 16, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

Top 7 airlines flying from Chicago to Port St. Lucie

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