Getting approved for a travel rewards card used to mean sitting on your hands for five to ten business days while the plastic made its way through the post. That's changing. A growing list of issuers — including American Express, Capital One, Chase, Citi, Discover and SoFi — now let eligible applicants use their new card the same day, either by revealing an instant card number or by adding the card straight to a digital wallet.

The timing matters more than it sounds. Welcome bonus clocks start ticking the moment your account is approved, not when the card lands on your doormat. If you're chasing a sign-up offer like 175,000 bonus points after spending $12,000 in six months, losing a week to the postal service eats directly into your deadline. Instant access also means you can book flights or hotels straight away, or lock in a purchase before a 0% introductory APR window starts.

How it works varies by issuer. American Express hands over a full card number right after online approval, though the four-digit ID on the physical card will differ — a reason to hold off on setting up recurring payments. Some Amex cobranded cards (Delta, Hilton, Marriott) restrict instant use to purchases with that brand only. Capital One shows instant numbers in its mobile app for eligible approvals, distinct from its virtual card numbers that exist for purchase security. Chase skips the number entirely: its Spend Instantly feature lets you add approved cards to a digital wallet via the app, though Mastercards, Amazon cards and business cards are excluded.

Citi's approach is quirkiest — a "Get Card Number Today" option after approval gives you a temporary number you can view exactly once, so write it down. Costco cardholders get a barcode usable only at Costco, and business and American Airlines cards don't qualify. Discover issues a virtual card number for online use and wallets; Barclays offers something similar via its application status page. SoFi's three cards all go digital immediately, with physical cards arriving within 10 business days. Synchrony's PayPal and Venmo cards work instantly only inside their own apps, and Cardless cobranded cards (Avianca, Bilt, LATAM) are usable digitally for the life of the account.

Caveats worth knowing: instant approval doesn't guarantee instant access, since eligibility hinges on identity verification and sometimes an existing banking relationship — Bank of America's instant numbers, for example, are largely targeted at existing customers or app applicants. And if a cobranded card limits instant use to that brand, don't count on using it for general travel bookings on day one.

For anyone planning a big trip, this is genuinely useful. Points chasers can start a spending requirement before the card arrives; last-minute travellers can book immediately; and anyone eyeing a cobranded airline card can put it to work on the very flight they applied for. Check the issuer's app or approval page right after you're approved — that's where the number or wallet option appears.