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Lea este artículo en español: Volar a México con regalos y efectivo.

Every December, families from Chicago and Milwaukee fly south with suitcases full of gifts for relatives in Guadalajara, Morelia or Zacatecas. A family of four on an ultra-low-cost fare can pay more in bag fees than in airfare, and that is before Mexican customs asks whether twelve boxed phones are “luggage” or “merchandise.” Here is what the airlines charge, what customs counts as merchandise, and the two $10,000 cash declarations.

The problem: bags can cost more than the fare

Volaris and VivaAerobus base fares include only a personal item; a regular carry-on is an add-on. Their US bag fees are not fixed: Volaris publishes only maximum prices and Viva publishes estimated ranges, with the real number shown at booking and higher at the airport. On a Viva fare out of O’Hare, one extra 55-lb (25 kg) checked bag bought online runs $50 to $246 each way, and $188 to $273 at the airport. Multiply by four travelers and two directions and the “cheap” fare is not cheap. The legacy carriers publish fixed bag prices, so the family total is predictable.

Baggage fees by airline, US–Mexico (as of October 2026)

Per person, each way, from the airline’s own pages opened in October 2026. “Shown at booking” means the airline publishes no fixed price.

Airline	Carry-on	1st checked bag	2nd checked bag	Overweight	Source
Volaris (Zero / Basic / Plus)	Personal item only on Zero and Basic; Plus adds a 22×16×10 in carry-on (44 lb combined). Adding one: shown at booking (published maximum $102 at booking, $180 at gate)	Basic includes 1 bag to 33 lb; Plus 1 bag to 55 lb; Zero none. Buying one: shown at booking (maximum $180 at booking, $228 at airport)	Shown at booking (maximum $144 at booking, $264 at airport)	Excess bands 16–25 / 26–35 / 36–45 kg, maximums $180 / $204 / $276	Volaris baggage policy and fee schedule
VivaAerobus (Switch / Smart)	Personal item 18×14×8 in on all fares; carry-on 22×16×10 in, 22 lb on Switch, 33 lb on Smart. Adding a 10-kg carry-on from ORD: $31–$34 online, $92 at airport	Switch: 33 lb if added; Smart: 55 lb included. Extra 25-kg bag from ORD: $50–$246 online, $188–$273 at airport (other US airports: $154–$160 online, $188 airport)	Same extra-bag pricing; max 3 checked bags on US flights	Upgrade to 32 kg: $13–$105 online from ORD; oversize $131 at ORD airport	Viva baggage policy and fees page (updated February 2026)
Aeroméxico (Basic / Classic / AM Plus)	Basic: carry-on + personal item, 10 kg combined; Classic and AM Plus: 15 kg	Not included on US routes. Fare pages list $30 USD for Basic and AM Plus, but Aeroméxico notes new US prices for tickets issued from April 16; shown at booking	Shown at booking (Classic and AM Plus advertise 25% off extra bags)	Shown at booking	Aeroméxico branded-fare pages
United	Carry-on + personal item except Basic Economy	Shown at booking via United’s bag fee calculator; US–Mexico fees rose for tickets bought on or after April 3, 2026	Shown at booking	Economy limit 50 lb / 62 in; surcharges in the calculator	United checked bags page
American	22×14×9 in carry-on + 18×14×8 in personal item	Main Cabin $50 ($45 online); Basic Economy $55 ($50 online), for tickets issued on/after April 9 and May 18, 2026	Main Cabin $60 ($55 online); Basic Economy $65 ($60 online); 3rd bag $200	51–53 lb $30; 54–70 lb $100; 71–100 lb $200; oversize 63–65 in $30, 66–115 in $200; boxes max 80 in to/from Mexico	American checked and oversize bag pages
Southwest	24×16×10 in carry-on + personal item, free	$45 on Basic, Choice and Choice Preferred (tickets on/after April 9, 2026); free on Choice Extra, A-List, A-List Preferred and for Rapid Rewards cardmembers	$55 ($35 A-List; free A-List Preferred and Choice Extra); 3rd+ bag $150	51–70 lb $100 + bag fee; 71–100 lb $200; oversize 63–80 in $200. Table is labeled “U.S. Mainland”; confirm for Mexico	Southwest optional travel charges

Two patterns matter: the ultra-low-cost carriers price by weight tier, so a 33-lb bag and a 55-lb bag are different products, and airport prices are always the worst.

Packing strategy for gifts

• Ship the heavy, cheap stuff; carry the light, valuable stuff. Coats, shoes and kitchenware weigh a lot and are worth little per pound; phones and jewelry are the opposite. If a box of coats pushes you into a $100 overweight band, compare that with shipping it.
• Unbox electronics and keep receipts. Customs treats a sealed, boxed phone differently from the phone in your pocket. Remove retail packaging, set up devices, and carry receipts: both the duty-free allowance and the 19% simplified tax require proof of value.
• Split items across travelers. The baggage list applies per passenger, and family members arriving together may pool their allowances. Four people each carrying one laptop is baggage; one person carrying four laptops is not.
• Weigh at home and buy bags online. A $20 luggage scale is cheaper than any overweight fee above, and every airline charges more at the counter.

Cash and documents: the two $10,000 declarations

Leaving the United States. Federal law requires anyone carrying more than $10,000 in currency or monetary instruments into or out of the US to report it to Customs and Border Protection on FinCEN Form 105. CBP’s page states that for families or groups “the $10,000 threshold applies to the total amount they are carrying or sending collectively, not per individual.” Carrying the money is legal; failing to report it can mean seizure and civil or criminal penalties. File electronically at fincen105.cbp.dhs.gov before you travel. Monetary instruments include cash in any currency, traveler’s checks, and endorsed or bearer checks and money orders.

Entering Mexico. Mexico’s 2026 General Foreign Trade Rules (rule 2.1.3, under Article 9 of the Ley Aduanera) require anyone bringing in or taking out cash, domestic or foreign checks, money orders or other collectible instruments worth more than the equivalent of US$10,000 to declare them on form D4, “Declaración de Internación o Extracción de cantidades en efectivo y/o documentos por cobrar.” It can be filed electronically through the SAT portal, which issues a receipt valid for 30 days. Rule 3.2.6 repeats the obligation for arriving air passengers and says customs may inspect baggage and sanction undeclared cash.

What Mexican customs treats as merchandise

Rule 3.2.3 defines passenger equipaje as a specific list of new or used goods; anything else is merchandise. The list includes clothing, shoes and toiletries “consistent with the length of the trip”; two cameras; three cell phones; two tablets; two laptops; five toys plus one game console and five games; books; two musical instruments; one hand-tool set; personal medicines; and, for adults, 20 packs of cigarettes, 25 cigars, 3 liters of spirits and 6 liters of wine. Baggage must be carried by the passenger. On top of that, each air passenger gets a US$500 duty-free allowance (franquicia) for other goods, which family members arriving together may pool. Beyond it, rule 3.2.2 lets you pay a flat 19% tax on goods worth up to US$3,000 (US$4,000 with computers) without a broker, if you have receipts. Rule 3.2.6 then sorts arrivals into the “nothing to declare” lane and the “self-declaration” lane where you pay. A separate article in this series covers the allowance in detail; see our Mexico travel coverage.

Pay for bags with the right card

Bag fees bought online for US routes are usually billed in dollars, but counter purchases and anything bought in Mexico may post in pesos, so use a card with no foreign transaction fee. Some premium travel cards also carry travel or airline-fee credits that can reimburse bag fees; check your card’s current terms. Southwest’s Rapid Rewards cards waive the first checked bag, worth $360 round trip for a family of four at the new $45 rate.

Flying a family to Mexico every December is exactly the recurring spend a no-foreign-transaction-fee travel card is built for. If you are considering a Chase Sapphire card, you can apply through our Chase referral link.
Disclosure: This is our personal Chase referral link. If you’re approved through it, we may earn a referral bonus, at no extra cost to you. You can always apply directly on Chase’s website. See our Advertising & Referral Disclosure.

Our take

Price the whole family, not the fare. Add up four carry-ons and four checked bags at each airline’s online price before you buy; Volaris and Viva will not show a fixed number until checkout. For a Chicago family hauling gifts, American’s $45 online first bag and Southwest’s $45 (or free with the card) are often cheaper than an ultra-low-cost fare plus bags, and far more predictable. Unbox the electronics, carry the receipts, split gifts among travelers, and if anyone is carrying serious cash, file the FinCEN 105 before you leave and the D4 when you land. Neither form costs anything; skipping them can cost everything you are carrying.

Sources

• Volaris baggage policy and maximum-price fee schedule
• VivaAerobus baggage policies and fees and charges (last update February 2026)
• Aeroméxico branded fares: Basic, Classic, AM Plus, Básica (Spanish)
• United checked bags
• American checked baggage policy and oversize and overweight bags
• Southwest optional travel charges and carry-on policy
• US CBP, Money and Other Monetary Instruments (last modified November 24, 2025); FinCEN 105 e-filing
• Reglas Generales de Comercio Exterior para 2026, rules 2.1.3, 3.2.2, 3.2.3 and 3.2.6 (DOF, in force January 1 to December 31, 2026): sidof.segob.gob.mx/notas/docFuente/5777199

Fees and rules change; confirm with the airline and customs before you travel. Points Capital is not a financial or legal advisor.