What is Expedia's One Key program?

One Key pools loyalty points across Expedia, Hotels.com, and Vrbo under a single account, earning OneKeyCash on every booking that's usable as a discount on a future one, applied automatically at checkout when you're signed in.

Is it cheaper to book a flight and hotel together on Expedia?

Almost always, yes — booking a flight and hotel together as a package triggers an automatic discount compared to booking each separately, often the single biggest saving available.

Is the Expedia app cheaper than the website?

Sometimes — Expedia regularly offers "app-only" hotel rates slightly below the desktop site's price, so it's worth comparing the same property on both before booking.

Expedia Promo Codes: The Hidden Key

Expedia changed how it rewards customers with the launch of the One Key program, which now pools loyalty points across Expedia, Hotels.com, and Vrbo under a single account. In practice, that means points earned on a hotel booked through Hotels.com can now go toward paying for a flight or a vacation rental booked through Expedia — which wasn't the case before.

How One Key points work

Every booking (hotel, flight-plus-hotel package, car rental, activity) earns what's called "OneKeyCash," usable directly as a discount on a future booking once you hit a minimum balance. That amount shows up automatically at checkout if you're signed into your account — again, no code to hunt for elsewhere.

The real extra discounts

Flight + hotel packages: booking a flight and a hotel together on Expedia almost always triggers an automatic discount compared to booking the two separately — compare both before choosing.
Member rates: some properties show a discounted rate that's only visible when you're signed into your One Key account, similar to how Booking.com's Genius program works.
One-off promo codes: Expedia sometimes sends codes by email after a booking, valid on a future trip, with a specific expiry date worth checking before you file it away for later.

How to apply an Expedia code

Add your booking to the cart.
At the payment step, look for the "Promo code" or "Coupon" field, usually below the price summary.
Enter the code and confirm the total drops before continuing.
If you're using OneKeyCash, check that its own checkbox is ticked separately from the code field.

Why your Expedia code isn't applying

The code applies to a different booking type (hotel-only vs. a flight + hotel package).
You're not signed into your One Key account at checkout.
The code has passed its expiry date or was tied to a marketing campaign that's already ended.
The selected property or flight explicitly excludes promotional discounts (often noted in fine print on the rate details).

One Key and flight + hotel bundles

The One Key loyalty program (shared across Expedia, Hotels.com, and Vrbo) grows your status and unlocks member rates. Booking a flight + hotel bundle together is also almost always cheaper than booking each separately — often the single biggest saving available, before even looking for a code. On a longer trip, the weekly discounts Airbnb hosts apply follow a different logic, and sometimes beat it outright.

The mobile app, sometimes cheaper than the site

Expedia regularly offers "app-only" hotel rates slightly below the desktop site's price, no code required — you'll see the gap by comparing the same property on both. App-only pricing is a pattern in its own right: Uber Eats takes it much further, to a point that explains most of the codes that fail there. Also keep your One Key account active: points expire after a period of inactivity.

Bottom line

A flight + hotel bundle stays the biggest saving available at Expedia, well ahead of any code — keep your One Key account active too, so you don't lose your points. And check the rate shown in the app too — it's sometimes a touch lower than the desktop site's price.