Frontier Airlines Liquid Rules: Complete Guide 2025

When you are at the security checkpoint, you have a very neatly packed bag and then you pick up a little, seemingly innocent-looking bottle of sunscreen, and then, that becomes your evil travel tale. I have been there when it comes to the point of anxiety where you are so unsure if your favorite shampoo will be detected on the X-ray machine. As with all the airlines in the country, when you travel with Frontier, your liquid carry-on compliance is ruled by a single non-negotiable sheriff, the TSA 3-1-1 Rule. This is the guideline set that unlocks the hassle-free trip. Basically, the rule stipulates that all liquid, gel, and aerosols have to be contained in a container that is 3.4 ounces or less and that all the travel-sized items should be placed in one bag that is clear and that is up to 1 quart-sized.

Frontier Airlines exists only within these federal limits, so the knowledge of the 311 rule is not only a suggestion when it comes to saving time and making sure that your baggage flies with you in the airplane; it is the golden ticket. This is the ultimate guide that will divide the liquid rules for Frontier airlines, discuss essential exceptions such as medicines and infant food, and provide tips that will allow you to pack like a professional traveler. Be prepared to sail through security confidentially. 

Why Understanding Liquid Rules Matters

People who are traveling always consider passing through airport security at a time that is least annoying and as short as possible. Through a full understanding of the rules and regulations, one may know that disobeying them, even inadvertently, will lead to long delays due to checks and might even result in confiscation of expensive or necessary items such as full-size toiletries. The liquid rules for Frontier airlines are usually federally mandated, as such with security, and by knowing these, you reduce your chances of having a nasty experience each time you fly. You just breeze stress-free to your gate.

Overview of TSA 3-1-1 Rule for Liquids

The TSA 3-1-1 Rule has become the universal rule, which is applied in regard to carrying liquids, aerosols, gels, creams, and pastes in your carry-on baggage on any domestic flight, including the Frontier flight. It is simple to memorize and rigidly practiced in the security checkpoints. The three figures show the following requirements:

• 3 - 3.4 Ounces: The volume of each liquid container is to be no more than 3.4 ounces. This limitation is based on the container's size not the quantity of liquid it contains. A half-full eight-ounce bottle is prohibited.
• 1 Quart-Sized Bag: You have to be able to put all of your travel-sized liquid containers in one bag, which is made of plastic, is transparent, has a capacity of a quart, and is reusable. This enables officers to have an easy time viewing the contents.
• 1 Bag Per Passenger: Each passenger is only allowed one bag of quart size.

Frontier Airlines Carry-On Liquid Policy

Although Frontier Airlines stipulates the rules regarding baggage size and weight, the liquid policy regarding the carry-on baggage items on any flight is determined by the national Transportation Security Administration (TSA) using the universally applicable rule of 3-1-1. This implies that be it flying with Frontier or any other domestic airline, the liquid rules for Frontier airlines are the same. This simple rule is the key to you being able to pass through the security checkpoint much faster once you have followed it.

What Counts as a Liquid?

The TSA has a general definition of items that should be considered in 3-1-1 rule. Unless a substance has a certain shape and it assumes the shape of its content, it should do so. This involves anything that can be spilled, sprayed, spread, pumped or poured.

• Toiletries: Skin care, shampoo, conditioner, liquid soap, mouthwash, contact lens solution, hairspray, aerosol deodorant.
• Pastes and Gels: Toothpaste, shaving cream/gel, hair gel and petroleum jelly.
• Food Items: Water, juice, yogurts, honey, syrup, jam, peanut butter, hummus as well as dips.
• Make-up: Liquid make-up foundation, liquid eyeliner, mascara, lip gloss and liquid hand sanitizer. There is a current temporary exception of up to 12 oz of liquid hand sanitizer, but it may change.

Allowed vs. Prohibited Liquids 

The Frontier airlines liquid carry on policy have a list of items that are prohibited and the ones that are allowed on the flight journey. Before starting the journey, make sure you are well aware of such a list so no mistakes are made and you can travel trouble-free: 

Tips to Pack Liquids in Your Carry-On

The most unpredictable aspect of any journey seems to be passing through a security checkpoint but it does not have to be so if you are adequately prepared with the liquid for saving that little time, preventing spills, and allowing for a smooth screening process. The tips you must consider are discussed below:

• Put your liquids bag right on top of everything in your Frontier airlines carry on liquid rules so you may retrieve it easily and quickly at security. 
• Do not fill your liquids to the top; always leave a little air on top for expansion through flight; this will help avoid leaking. 
• For extra protection from leaking, loosen the cap and put a square of plastic wrap over the mouth of the bottle, then tighten the cap again. 
• If your liquids or baby formula must be carried on, pack them in different bags and declare them to the officer. 
• Abide by the 3.4 rule and check the containers twice. Unless it is smaller than this either fully or partially, check that it fits into your baggage. 
• Purchase a set of reusable, leak-proof travel bottles instead of the flimsy travel sizes from stores. 
• Instead of liquid soap, deodorants, and makeup, pack solids that do not fall under the 3-1-1 rule. 
• Purchase a sturdy, clear resealable plastic bag that does not easily tear and keep this instead of a regular sandwich bag. 
• Travel bottles should be filled just enough to last you through your trip; leave out most of the rest. 
• Your quart bag needs to be clear but not bloated, so security can easily envision its contents without a closer examination.

Frontier Airlines Checked Baggage Liquid Rules

Flying Frontier, you can most often carry in your Frontier alcohol rules for checked full-sized containers of shampoo, body wash, wine, or any other type of common toiletry or beverage, as long as you have met the total weight and dimension restrictions imposed by the airline. Yet, such liberation is not applied to hazardous materials. Federal regulations also do not allow dangerous commodities to be carried, even in the baggage, especially flammable liquids. 

Liquids in Checked Luggage: What You Can Bring

The main issue regarding liquid volume in checked baggage is also replaced by the safety of baggage size, weight, and content. But remember that everything in your liquids should be able to fit into the standard baggage size at Frontier:

• Size Freedom: You can carry full-sized liquids, aerosols, gels, and creams in your checked baggage.
• Aerosols: Aerosols that are not flammable such as hairspray, insecticides, and personal care products, can be carried in checked baggage. All such items should not be more than 70 ounces in total per person and each container should not be more than 16 fluid ounces.
• Alcohol: Alcohol can be transported in the checked baggage, but within the Frontier airlines liquid limit.

Restrictions on Flammable or Hazardous Liquids

Although baggage that is checked allows a lot more flexibility, the federal regulations regarding safety put a strong prohibition on dangerous substances in order to keep the airplane and passengers safe. The items are prohibited in carry-on and checked baggage:

• Flammable Liquids: These consist of gasoline, lighter fluid, paint thinner, liquid fuels and most of the household spray paints.
• Corrosives: Acids, liquid drain cleaners, and other wet-cell batteries other than mobility devices.
• Toxics: Poisons, tear gas and some chemicals.
• Explosives: Flares, explosives, and blasting caps.

Alcohol Rules for Checked Baggage

A visit to a favorite local spirit or a special bottle of wine is often a major highlight of a trip. The positive side is that when you are packing alcohol in your Frontier checked baggage, then the heavy 3.4oz restrictions are eliminated and you can travel with full-size containers. The regulations stipulate the quantity of alcohol that can be safely be carried along and, most importantly, not stuffing in the cargo hold of the aircraft with highly flammable, high-proof spirits that are dangerous to the plane. 

Bringing Alcohol Purchased at Duty-Free

There is a special exception on the carry-on liquid rules for Frontier airlines in duty-free purchases, particularly in travelers coming in, especially those in international destinations.

• Carry-on exemption: When you buy a liquid exceeding 3.4 oz of the same in a duty-free store abroad, you might be allowed to carry it on a connecting domestic flight. Ensure the retailer wraps up the product in a clear, secure and Tamper-Evident Bag and leaves the bag in good condition. You need to provide the original receipt which manages to indicates that you have made the purchase within the past 48 hours.
• Checked Baggage Recommendation: As a best practice, the TSA would suggest putting any liquid that is greater than 3.4 oz in your checked baggage once you clear your customs at your first point of entry into the country, as a way of preventing possible complications during the screening process.

Alcohol Percentage Limits (ABV Regulations)

The given rules and regulations are applied to all the alcohol you transport along with your checked baggage, so they must be in an unopened retail packaging so you can receive them safely: 

Medical and Infant Exceptions to Liquid Rules

Baby Formula, Breast Milk, and Medications

You can carry such things in reasonable amounts that are required on your trip.

• Infant Nourishment: This contains liquid formula, powdered formula, breast milk, toddler drinks, and baby food pouches. They are permitted in over 3.4oz containers, in which case you need not be in the company of your infant or child when carrying breast milk or formula. Ice packs, freezer packs or gel packs that are used to keep these items cold are also allowed in your carry on, they may either be partly frozen or slushy.
• Medically Necessary Liquids: This includes liquid prescription and necessary over-the-counter medicines that you require on board the plane. This also covers such vital medical supplies as distilled water in a CPAP machine, contact lens solution and liquid dietary supplements.

How to Declare Medical Liquids at Security

The primary action by the passenger, with exceptions, will be declaration and not waiting for the officer to find the items. Do not wait for the officer's detection of the items; declare them yourself. 

• Notify the Officer: At the commencement of screening, inform the TSA officer that you possess medically necessary liquids and/or infant feed in excess of $3.4$ oz.
• Separate the Items: Remove the exempted items from the carry-on bag and place them in a separate bin for screening. They do not need to be in the quart-sized bag.
• Prepare for Inspection: The TSA officer may need to subject these liquids to additional screening which may involve visual inspection swabbing the outside of the container for explosive trace detection or using specialized liquid scanners.
• Documentation: While not obligatory, supporting documentation is highly recommended and especially in the case of prescription medicines. This may include the original prescription container, a note from your physician, or a medical ID card.

Frontier Airlines International Flight Liquid Policies

When you are booked on a Frontier flight to a destination outside the US your carry-on Frontier airlines liquid policy combines several regulations such as the domestic security and those of the foreign country you are entering or leaving. It is particularly important to keep this in mind if you have made any duty-free purchases or have an upcoming connecting flight as a large liquid item that was fine when leaving the airplane may get confiscated at the next checkpoint.

Customs and Duty-Free Guidelines

Duty-free sales are the largest source of confusion for international travelers. The guidelines you must follow are explained further for your convenience:

• Liquids bought from airport retail shops after the security checkpoint are generally amenable on a first outbound Frontier flight regardless of size. 
• If an international duty-free store sells liquids above a volume of 3.4 oz, that purchase is allowed only at the connecting domestic security checkpoint.
• It must be sealed inside a Secure Tamper-Evident Bag.
• The bag must have remained sealed and undamaged since the time of its purchase.
• The actual sales receipt inside the bag must be visible, showing that the purchase was made within the last 48 hours.
• If the TSA agent is unable to screen the duty-free liquid appropriately, you will be required to place it in checked luggage or surrender it. 
• To avoid that risk, it is highly recommended to pack any big liquid purchases into checked baggage immediately upon getting them from customs after arrival.

Liquid Regulations by Destination Country

While most countries, including those in the EU, Canada, and Australia, have adopted the same $100$ mL limit for carry-on liquids, you must also know that some variations exist.

TSA vs. Frontier Airlines: Who Sets the Rules?

Authority on what you can take into the airplane is divided between two: the Transportation Security Administration (TSA) and Frontier Airlines. They control their own parameters with respect to your baggage.