When your travel plans include a four‑legged companion, picking the right airline out of McAllen, Texas, makes all the difference. All five passenger carriers at McAllen Miller International Airport (MFE)—American Airlines, United Airlines, Delta Air Lines, Allegiant Air, and Volaris—accept pets on select flights, but each one handles animals in its own way. From in‑cabin carriers that fit under the seat to temperature‑controlled cargo compartments, the options cover small dogs and cats up to larger breeds. This guide walks you through each airline’s fees, carrier rules, health requirements, and boarding limits, plus practical steps to prep your pet for a smooth, stress‑free flight. Whether you are heading to a domestic hub or crossing into Mexico, knowing the right policy before you book can save you time, money, and a whole lot of worry at the gate.

Key Takeaways

  • All five airlines at McAllen allow pets, but in‑cabin versus cargo options vary widely by carrier and route.
  • Fees range from $50 to $125 each way for in‑cabin travel; cargo costs are calculated by weight and distance.
  • Health certificates and airplane‑ready carriers are non‑negotiable—plan at least 10 days ahead.
  • Breed restrictions and weather‑related embargoes can halt pet travel even if you have every document in hand.
  • Cargo holds for pets are pressurized and temperature‑controlled on all major airlines, but your pet will travel in a separate, monitored section.

Airlines at a Glance: Pet Travel from McAllen

American Airlines

American Airlines allows small dogs and cats to travel in the cabin on most domestic and short‑haul international flights out of McAllen, provided the pet and its carrier weigh no more than 20 pounds combined. The in‑cabin carrier must fit completely under the seat in front of you, and the pet must remain inside for the entire flight. The fee is $125 each way for in‑cabin pets. For larger animals, American accepts pets as checked baggage on certain flights or via its dedicated cargo service. Checked pets require a hard‑sided, airline‑approved kennel with proper ventilation and secure latches. You will need to present a valid health certificate issued by a licensed veterinarian within 10 days of travel, as well as up‑to‑date vaccination records. Booking early is essential—American limits the total number of pets allowed per flight, and cabin spots sell out fast. View the full American Airlines pet policy on their site.

United Airlines

United’s in‑cabin pet program is limited to small cats and dogs that fit in a soft‑ or hard‑sided carrier under your seat. The combined weight of the pet and carrier cannot exceed 18 pounds, and the in‑cabin fee is $125 each way. United no longer transports pets as checked baggage; instead, larger animals travel through its PetSafe cargo program. PetSafe uses dedicated, temperature‑controlled cargo sections with active monitoring. You will need a health certificate dated within 10 days (30 days for some international routes) and proof of rabies vaccination. Certain brachycephalic (snub‑nosed) breeds are restricted from cargo travel due to breathing risks. Because PetSafe capacity is limited and subject to weather embargoes during extreme heat or cold, you should reserve a space at least two weeks ahead. Get specifics on United’s website.

Delta Air Lines

Delta welcomes small pets in the cabin on most flights from McAllen for a $125 fee each way. The soft‑sided carrier must tuck fully under the seat, and the pet must stay inside throughout the flight. Delta also accepts pets as checked baggage on select narrow‑body aircraft, and larger animals can move through Delta Cargo, which features climate‑controlled vehicles and pressurized holds. Required paperwork includes a health certificate dated within 10 days of departure and a current rabies vaccination certificate. Delta enforces seasonal restrictions: pets are not accepted as checked baggage when ground temperatures at any point in the journey exceed 85°F or drop below 20°F. Similarly, short‑nosed breeds like bulldogs and pugs face additional cargo restrictions. Because in‑cabin spots disappear quickly, Delta recommends booking your pet’s reservation at the same time you purchase your own ticket. Explore Delta’s pet travel details on their website.

Allegiant Air

Allegiant keeps pet travel simple: only small dogs and cats are allowed, and they must ride in the cabin. There is no checked pet or cargo option. The in‑cabin carrier must fit under your seat, and the fee is $50 per segment, per pet. That means a round‑trip flight with a connection costs $100 each way, or $200 total. Allegiant caps the number of pets per flight, so make your reservation early. You will need a current rabies vaccination certificate; a general health certificate is not always required but is recommended. The airline does not ship pets to or from Hawaii or international destinations. Because Allegiant operates point‑to‑point routes from McAllen—often to leisure markets like Las Vegas, Orlando/Sanford, and Nashville—it can be a budget‑friendly choice for domestic vacations with your small pet. Check Allegiant’s pet policy page before booking.

Volaris

If you are flying between McAllen and Mexico, Volaris permits pets in the cabin and in its cargo hold. In‑cabin travel is limited to small dogs and cats in an approved carrier under the seat; the fee varies by route and currency but generally runs about $50–$100 USD each way. Larger animals can travel as manifested cargo in a ventilated, locked kennel. Volaris requires a health certificate issued by a veterinarian within 5 days of travel and a valid rabies vaccination certificate. Because Volaris is a Mexican carrier, documentation for animals crossing international borders must also comply with the destination country’s import regulations; for Mexico, this typically means the pet must be microchipped and accompanied by a bilingual health form. As with U.S. carriers, capacity is limited and breed restrictions apply, especially in cargo. Visit Volaris’s official page for the latest requirements.

Essential Pet Travel Policies and Requirements

Carrier Size and Weight Restrictions

Every airline at McAllen enforces strict limits on carriers. For in‑cabin travel, the carrier—whether soft‑sided or hard‑sided—must slide under the seat in front of you. Typical maximum dimensions are about 18.5″ long × 8.5″ high × 13.5″ wide, but each airline publishes its own exact numbers. The combined weight of the pet and the carrier usually must stay under 20 pounds for American and Delta, 18 pounds for United, and similar ranges for Allegiant and Volaris. If your pet exceeds these limits, they will need to travel as checked baggage or cargo, which requires an approved hard‑sided kennel. The kennel must be large enough for the animal to stand, turn around, and lie down naturally without touching the top. Ventilation on all four sides and secure metal hardware are mandatory. Airlines will deny boarding at the counter if the carrier is too large, flimsy, or missing required markings, so measure and check the USDA APHIS pet travel resources for a list of International Air Transport Association (IATA) compliant crates.

Health Certificates and Documentation

Regardless of which carrier you choose, a health certificate from a licensed veterinarian is the golden ticket. Most U.S. airlines insist the certificate be issued within 10 days of your flight. The document states that your pet is free of contagious diseases and fit to fly. For international travel on Volaris, the window shrinks to 5 days, and additional import documents may be needed. You must also carry a current rabies vaccination certificate, and some airlines request proof of other core vaccines. Keep both original and digital copies in your carry‑on. At check‑in—and sometimes at security—an agent will review the paperwork, and missing any part can mean your pet stays on the ground. The USDA APHIS pet travel site offers current requirements for domestic and international movement, including approved forms for U.S.-Mexico travel.

Cabin vs. Cargo Transport

The method of travel hinges on your pet’s size and breed. In‑cabin pets ride in the main cabin with you, which is least disruptive for small, calm animals. They remain in the carrier the entire time, under your seat. Cargo travel—offered by American, Delta, United (via PetSafe), and Volaris—places your pet in a separate, pressurized compartment that is temperature controlled and often monitored by ground staff. Modern cargo holds are neither freezing nor oven‑like; they are designed for live animals when outside temperatures are within safe limits. However, cargo pets are accepted based on flight availability and can be denied during extreme weather because they may be exposed during ramp transfer. If your pet is traveling in cargo, confirm drop‑off and pick‑up times, which typically differ from passenger check‑in. Always label the kennel with your contact information, flight numbers, and a “Live Animal” sticker to help handlers.

Preparing Your Pet for a Flight from McAllen

Schedule a Vet Visit

Book a veterinary appointment as soon as you know your travel dates. The vet will perform a thorough exam, ensure vaccinations are current, and discuss any health issues that might make flying risky. Brachycephalic breeds, elderly pets, very young animals (under 8–10 weeks), and pregnant pets may need special clearance—or may be barred from flying altogether. If your pet has anxiety or motion sickness, ask about non‑sedative calming aids. Also, get the necessary health certificate and any additional state‑required forms. Keep your vet’s contact information handy in case any questions arise at the airport.

Choose the Right Carrier

Invest in a carrier that meets your airline’s specific measurement and construction standards. For in‑cabin travel, soft‑sided carriers with mesh panels give better ventilation and are easier to stow. For cargo, hard‑sided plastic crates with metal bolts, secure doors, and interior tie‑down anchors are required. Introduce your pet to the carrier at home days or weeks ahead. Feed them inside it, place treats, and let them nap there so the space feels familiar on travel day. Affix a live‑animal sticker, your name, address, and a destination phone number on the outside. A laminated photo of your pet taped to the crate is also a good idea in case you are separated.

Feeding, Hydration, and Comfort

Feed your pet a light meal about 4 to 6 hours before departure. A full stomach can lead to nausea at altitude. Avoid heavy treats right before boarding. Provide water in small amounts up until check‑in; for cargo crates, attach a spill‑proof water bottle that the animal can access. Inside the carrier, add a familiar blanket or a worn t‑shirt carrying your scent. A favorite chew toy can occupy nervous energy, but avoid anything that could become a choking hazard. Never sedate your pet unless your veterinarian specifically prescribes it and you have confirmed the airline’s policy. Many airlines prohibit sedated animals in both cabin and cargo because of the increased risk of respiratory or cardiovascular difficulties at cabin pressure. Instead, rely on pre‑flight exercise and quiet reassurance.

At the Airport: Check‑In and Boarding Tips

Arrive at McAllen Miller International Airport at least two hours before a domestic flight and three hours before an international departure. Check‑in for pets is always done at the ticket counter; you cannot use curbside or self‑service kiosks. The agent will inspect your paperwork, weigh the carrier if needed, and collect the pet fee. After that, you may need to remove your pet from the carrier at the security checkpoint so the crate can go through the X‑ray machine while you carry the animal or walk through the metal detector on a leash. Keep a lightweight leash and collar on your pet until you re‑secure them. Once at the gate, try to find a quiet corner away from loudspeakers and foot traffic. If your pet is flying in cargo, the airline will direct you to the drop‑off point. Confirm the pickup procedure at your destination, and verify that your pet’s connecting flight information is correct if you have a layover.

Fees at a Glance (Each Way)

  • American Airlines: $125 in‑cabin; checked baggage varies; cargo by weight.
  • United Airlines: $125 in‑cabin; cargo via PetSafe, cost by weight and route.
  • Delta Air Lines: $125 in‑cabin; checked cargo fees vary.
  • Allegiant Air: $50 per segment in‑cabin only.
  • Volaris: ~$50–$100 in‑cabin; cargo rates by route.

Keep in mind that service animals traveling with a qualified individual with a disability travel free of charge, but all policies above apply to pets and emotional support animals. As of recent rule changes, U.S. airlines are no longer required to accommodate emotional support animals as service animals, so they are treated as pets for travel purposes.

Frequently Asked Questions

Which airlines allow pets in the cabin from McAllen?

All five carriers that serve MFE—American Airlines, United Airlines, Delta Air Lines, Allegiant Air, and Volaris—allow small dogs and cats in the cabin if they and their carrier meet weight and size limits. Each airline has its own cap on the number of in‑cabin pets per flight, so reserve early.

How much does it cost to fly a pet out of McAllen?

In‑cabin fees range from $50 per segment on Allegiant to $125 each way on American, United, and Delta. Volaris charges approximately $50–$100 depending on the route. Cargo costs are higher and based on the animal’s weight plus crate dimensions; expect to pay $200–$400 or more for larger dogs.

What health documents do I need?

A health certificate issued by a vet within 5–10 days of travel (depending on the airline) and a current rabies vaccination certificate are the bare minimum. Some destinations require additional documentation, especially for international travel to Mexico. Check the USDA APHIS site for the latest rules.

Are there breed restrictions?

Yes. Brachycephalic (flat‑faced) breeds such as bulldogs, pugs, Persian cats, and boxers are commonly restricted from cargo travel due to breathing difficulties at altitude. Checked‑baggage and cargo acceptance for these breeds varies by airline and season. In‑cabin travel is usually still permitted if the pet otherwise meets size limits.

Can I sedate my pet for the flight?

It is generally discouraged. Many airlines explicitly refuse sedated pets because sedation can interfere with an animal’s ability to regulate body temperature and breathing during flight. If your veterinarian prescribes sedation for a medical reason, you must contact the airline well in advance and present the vet’s written recommendation—and even then, approval is never guaranteed. For most pets, a familiar blanket, a pre‑flight walk, and calm handling work better.