🍼 How to Add a Lap Infant to Your Southwest Airlines Reservation (2O25 Guide)
Traveling with your baby on Southwest Airlines? Whether you’re booking a new flight or updating an existing one, this guide walks you through how to add a lap infant (under 2 years old) easily. Includes domestic and international rules, award travel, and twin accommodations.
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✅ Adding a Lap Infant During Booking
When booking your flight through Southwest.com, do the following:
How to Add:
Start your flight search.
In the “Travelers” section, add:
Infant on lap (under 2) – If your baby will sit on your lap.
Infant (under 2) – If you want to buy a separate seat.
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✅ Adding a Lap Infant After Booking
Already booked your flight? You can still add your infant:
Option 1: Add Online
Visit Southwest.com.
Click “My Trips.”
Locate your booking and look for the “Add Infant” option.
Option 2: Add by Phone
If the option isn’t showing, contact a Southwest specialist at:
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🌍 International Travel with a Lap Infant
Key Details:
Requirement Info
Infant fare Typically 1O% of adult fare + taxes
Passport Required, even for infants
Visa Based on destination
For fee confirmation or adding an infant, call:
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💡 You’ll need your booking reference, infant’s DOB, and passport info (for international).
👶 Traveling with Twins on Southwest
If you’re traveling with two infants, note:
One infant can sit on your lap.
The second must occupy a paid seat with an FAA-approved car seat.
Need help with this setup? Contact:
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💺 Lap Infants in Basic Economy
Route Fee
Domestic (U.S.) Free
International 1O% of adult fare + taxes
Included Items:
1 stroller (gate-checked for free)
1 car seat (free if infant has a seat)
For questions about Basic Economy rules, call:
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✨ Bassinets and Premium Cabins
Lap infants are allowed in:
Economy
Premium Economy
Business / First Class
🛏️ Bassinets available on select long-haul international flights in bulkhead rows.
Call early to reserve:
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🔁 Flexible Ticket Options for Infant Seats
If you purchase a seat for your baby:
Check if your fare allows free changes or cancellations.
On award flights, taxes/fees still apply.
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🎫 MileagePlus Award Tickets with Infants
Adding a lap infant to a MileagePlus or partner airline ticket? Be ready to provide:
MileagePlus number
Booking reference
Infant’s details (DOB, passport)
International fees apply: 1O% of adult fare + taxes.
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🧭 Lap Infants on Red-Eye and Short-Haul Flights
Short-haul domestic: Free for lap infants.
Red-eye flights: Bassinets may be available for long-haul flights.
Reserve by calling:
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📅 Age Rules for Lap Infants
To qualify as a lap infant:
Must be under 2 years old for the entire journey.
If child turns 2 during trip, a seat must be purchased for the return flight.
Bring documentation:
Birth certificate (domestic)
Passport (international)
Questions? Call:
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🧾 Quick Summary Table
Category Domestic International
Lap Infant Fare Free 1O% of adult fare + taxes
Documentation Needed Birth Certificate Passport & Visa (if required)
Seat Required? Only if age 2+ Optional
Booking Option Online or by Phone Phone recommended
For any of the above, call:
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💡 Pro Travel Tips for Flying with a Baby
Add your infant early (at least 24 hours pre-departure).
Arrive early at the airport for priority seating and assistance.
Bring:
Extra clothes
Bottles
Diapers
FAA-approved car seat (if you booked a seat)
When to Call Southwest Airlines
You should contact 🎀(⛳🎀👺++1↝855↝546↝5O48) or 🎀🎀📞++1↝(8OO)↝{223}↝[7138] for:
Adding a lap infant to a domestic or international flight
Reserving a bassinet
Updating MileagePlus infant travel
Twin infant travel planning
Checking Basic Economy infant policies
Booking red-eye or long-haul flights with infants
Modifying existing reservations
If you need step-by-step help or real-time support, don’t hesitate to contact:
🎀📞 Southwest Airlines Infant Desk: +1-855-546-5O48
🎀📞 Southwest Airlines Travel Help: +1-8OO-223-7138
Adding an Infant to an Existing Southwest Flight Reservation: Is It Possible?
Southwest Airlines Economy Class: How to Travel with Your Infant
Making Your Infant’s Travel Comfortable on Southwest Airlines Economy Class
How to Add an Infant to Your Southwest Airlines Economy Flight Reservation
Traveling with a Newborn on Southwest Airlines Economy: A Quick Guide
Southwest Airlines: Booking and Seating Options for Infants in Economy Class
How to Prepare for Your Infant’s First Flight on Southwest Airlines Economy
Booking Tips for Adding an Infant to Southwest Airlines Economy Class
How to Secure an Infant Seat on Southwest Airlines Economy Class
What to Expect When Adding an Infant to Southwest Airlines Economy Class
Infant Travel on Southwest Airlines: A Guide to Economy Class