What Is Frequent Flyer Number and How Do You Use It?

New to loyalty programs? Your frequent flyer number is the key! Add it when you're checking out to earn miles on every available flight. Here’s what it is, how to get it, and where to find it so you can start earning and unlocking all the wonderful perks that comes with it.

What is a Frequent Flyer Number?

A frequent flyer number (FFN) is the unique ID for your airline loyalty account. By adding it into flight bookings, the airline can credit miles or points which tracks your elite stauses. Think of it as your loyalty "account number" which is something totally different from a ticket number or booking reference.

Some program examples:

• United MileagePlus (Star Alliance)
• Delta SkyMiles (SkyTeam)
• American AAdvantage (oneworld)
  

Normally, joining any loyalty program is FREE! Once you've received your loyalty number, enter it every time you book. Whether you are traveling on long-haul flights or just regular work trips, do not let go of any chance to add up your mileage! Frequent flyer number not only earns you a chance for a free flight, but many more perks such as: earlier boarding, preferred seats, extra check-in baggages, and dedicated customer support. Even for travelers who flys occasionally, focusing on flying with just one alliance can benefit from this system over time.

Note: If you're booking through Trip.com, enter your frequent flyer number during checkout so the airline can credit miles automatically for eligble fares. Once you are logged in, you'll also earn Trip Coins on top once your trip is completed.

Frequent Flyer Number: How to Get One (Free & Fast)

1. Pick a program you'll actually use. Normally the airline you fly the most or the alliance you prefer.
2. Join the airline's frequent flyer program (FFP) on its website or app. You will then receive your number immediately after sign up.
3. Start using it on your every bookings. Consider starting with a program in the same ailliance you use most (Star Alliance, SkyTeam, Oneworld) so you can earn with partner airlines using just one single number.
   
   Tip: When you are deciding on which airline to choose from, go with the one you tend to fly with the most often. The elite statuses for your account are normally recognized with all of its alliance partners as well. Still deciding on which program to choose from? Take a look at where you fly the most and check which airlines operate most in those routes!

Where to Find (or Recover) Your Frequent Flyer Number?

• Email/app: It's typically in your welcome email and your profile on the airline's wesbite or app.
  Delta Airlines Welcome Email:
  
  
  
  Source: Delta Airlines
  
• Past documents: Previous boarding passes and e-tickets sometimes show it your FFN as well.
• Can't find it? Log in and check "My Account".
  Delta Airlines My Account Page
  
  
  
  Source: Delta Airlines
  
• Most loyalty programs lets you retrieve your FFN by verifying your email or phone number and other personal details on their login page.
• If you really have trouble finding it, contact the airline's support team to recover your number or reset access.
  

How to Add Your Frequent Flyer Number on Trip.com

• On the Trip.com app (fastest):
  Search flights → choose your fare → traveler details → under the Passport field, add Frequent Flyer Number → continue to payment.
  On the Trip.com app, you could add it under "Traveler Details,“ and then open "Frequent Flyer Program (Optional)," select your airline. Lastly, enter your membership number to earn airline miles as well as Trip Coins.
  
  Adding Your Frequent Flyer Number Using Trip.com — 5 steps
  
  
  
  
• On the Trip.com website:
  Search flights → choose your fare → scroll down to Who's Traveling → fill in Frequent Flyer Number, click save → continue to payment. For group bookings, make sure that each traveler's frequent flyer number is entered under the correct passenger name.
  
• After Booking:
  Use Manage Booking to add/edit your FFN (if enabled for that carrier). If miles don't post, submit a missing miles claim with the airline using your ticket number, dates, and boarding pass image. If online editing isn't available, you can usually add the number during online check-in or ask an airport agent to attach it before boarding.

Frequent Flyer Number vs. Trip Coins

Simple takeaway: Your frequent flyer number builds airline miles and status inside one program or alliance; Trip Coins act like cash-back at Trip.com. So why not use both to maximize value on each of your bookings!
Details on Trip Coins—value, usage, earning conditions, and tier multipliers—come from Trip.com's offical explainer.

Frequent Flyer Number: Make Sure Your Flight Actually Earns

• Check the fare's earning rate (especially basic economy/discounted classes).
• Enter your frequent flyer number at checkout on Trip.com (or in Manage Booking).
• Match your name exactly with your FFP profile to avoid credit failures.
• Keep proof (e-ticket & boarding pass images) until miles/points post.
• If miles don't post: File a missing miles claim with the airline—one claim per missing segment.
• Before departure: Verify your frequent flyer number is on the reservation. You can usually see it in the airline app once you've added your booking reference
• After changes: if you rebook, get upgraded, or switch flights same-day, re-check that your frequent fluer number stayed attached—sometimes it drops during reissue.