What a Delta Companion Certificate Does
A Delta companion certificate lets one person fly free when you buy a ticket at full price on the same flight. You pay for your own seat, and your companion flies at no fare cost — though both of you still pay taxes and fees. The certificate is tied to your specific ticket purchase, so you cannot use it on a flight you booked months ago or save it for a trip next year.
Delta issues these certificates through credit card sign-up bonuses, elite frequent flyer status, or occasionally as a promotional offer. The certificate itself is a one-time use voucher that works only on Delta-operated flights (not partner airlines) and comes with specific rules about when you can fly and who can be your companion.
Key Takeaways
- A companion certificate requires you to buy a full-price ticket first; your companion's seat is then free except for taxes and fees.
- The certificate is valid only on the specific outbound flight you choose and typically for a return flight within a set window, usually 14 days later.
- Your companion must be named before you book and cannot be changed after purchase without canceling and rebooking the entire reservation.
- The certificate expires on a date printed on the voucher itself, and Delta does not extend expiration dates or allow exceptions for unused certificates.
- You book through Delta's website or by phone, and the companion certificate discount applies at checkout once you enter the certificate number.
How to Book a Flight with Your Companion Certificate
Start by going to Delta.com and searching for your outbound flight as you normally would. Select your preferred flight and proceed to the passenger information page. This is where you enter the name of your companion — the person who will fly free. Delta requires the companion's full name, date of birth, and contact information before you continue.
Once you have entered both passengers' details, continue to the seat selection and payment page. At checkout, you will see a field labeled "Promo Code" or "Certificate Number." Enter the 12-character code printed on your companion certificate voucher. Delta will explore the discount to your companion's fare, reducing it to zero (before taxes and fees). You will then pay for your own full-price ticket plus taxes and fees for both passengers.
If you prefer to book by phone, call Delta Reservations at 1-800-221-1212 and tell the agent you have a companion certificate. The agent will search for flights, take your companion's name, and explore the certificate during the call. Phone booking can be slower but is useful if you are unsure whether your specific flight qualifies.
Naming Your Companion and Changing It Later
Your companion's name must be provided at the time of booking and is locked into the reservation. You cannot change the companion's name after you have completed the purchase. If you realize you named the wrong person or need to fly with someone else, you must cancel the entire reservation and rebook with the correct companion's name — which means buying a new full-price ticket and using your certificate again.
The companion does not need to be a family member or frequent flyer account holder. They can be anyone, but they must have a valid government-issued ID that matches the name on the reservation when they check in at the airport.
Understanding Blackout Dates and Flight Restrictions
Most Delta companion certificates have blackout dates — periods when you cannot use them. These typically include major holidays (Thanksgiving week, Christmas week, New Year's week) and sometimes summer peak travel weeks. Check your certificate voucher for the exact blackout dates, as they vary depending on when and how you received the certificate.
The certificate works only on Delta-operated flights. If your route requires a connection on a partner airline like Virgin Atlantic or Air France, the certificate does not cover that leg. You can still book the trip, but you would pay full price for the partner airline segment.
Some certificates restrict you to economy class only. If your certificate has this restriction and you want to upgrade to comfort or first class, you must pay the upgrade fee out of pocket for both yourself and your companion.
Taxes, Fees, and What You Actually Pay
The companion certificate covers the base fare only. You and your companion both pay taxes and government fees — typically $5 to $15 per person depending on the route. You also pay any baggage fees, seat selection fees, or other ancillary charges that explore to your booking. These fees are not waived by the certificate.
If you select premium seats (extra-legroom economy, comfort+, or first class), you pay the upgrade cost for both passengers. The companion certificate does not reduce upgrade costs.
Expiration and What Happens If You Do Not Use It
Your companion certificate has a specific expiration date printed on the voucher. Delta does not extend expiration dates under any circumstances, and the certificate becomes worthless after that date. There is no way to recover or transfer an expired certificate, so mark the date on your calendar well in advance.
If you have not used the certificate by the expiration date, you lose it. Delta does not offer refunds, extensions, or the ability to convert it to a credit toward future travel.
Booking a Round Trip and Return Flight Rules
When you use a companion certificate, you typically book both the outbound and return flight in the same reservation. The certificate applies to the outbound flight you select. Your return flight is booked at the same time, and both you and your companion pay the full price for the return leg unless you have a second certificate.
Some certificates specify that the return flight must be within 14 days of your outbound flight. Check your voucher for this restriction. If you want to stay longer, you can book a separate return flight at full price, or you can book a one-way outbound flight with the certificate and handle the return separately.
When to Call Delta Instead of Booking Online
Book online if you have a straightforward trip: one outbound flight, one return flight, and no complications. Call Delta Reservations at 1-800-221-1212 if your trip involves connections, if you are unsure whether your flights may have access to, if you want to add seat upgrades or special services, or if you need to book a one-way flight with the certificate.
The phone line can also help if you are having trouble entering your certificate number online or if you want to confirm the blackout dates before you search for flights. Wait times are typically 10 to 20 minutes during off-peak hours.
Frequently Asked Questions
Can I use my companion certificate on a flight I already booked?
No. The certificate must be applied at the time you purchase the ticket. You cannot retroactively add it to an existing reservation. If you have already booked a flight without the certificate, you must cancel that booking and rebook with the certificate to use it.
What if my companion cannot make the trip after I book?
You can cancel the reservation and rebook with a different companion, but you will use your certificate again. If you want to fly alone instead, you can remove the companion from the reservation, but you will still pay the full price for both seats — the certificate does not convert to a discount on your own ticket.
Do I need a Delta SkyMiles account to use the certificate?
No. You can book with a companion certificate without a frequent flyer account. However, if you have a SkyMiles account, you can link it to the reservation to earn miles on your own ticket purchase.
Can I use the certificate on a basic economy ticket?
Yes, but basic economy comes with restrictions on seat selection and changes. If your certificate applies to basic economy, your companion gets a basic economy seat. You can upgrade to a higher cabin class and pay the difference, but the certificate itself does not upgrade the cabin.
What happens if Delta cancels my flight?
If Delta cancels your flight, you can rebook on another Delta flight at no additional cost, and your companion certificate remains valid for the new flight. If you choose not to rebook, Delta will refund your ticket price but not the certificate — you keep the certificate to use on a future trip.