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21st Birthday Helium Balloons Delivered

Helium balloons delivered inflated for a 21st: rose gold holographic, black and gold, pretty pink and confetti designs, giant 21 numbers in many colours, and personalisable bubble balloons in rose gold, gold, pink and blue.

  • Order by 1pm Mon–Fri for same-day despatch
  • Free delivery on qualifying orders
  • Next day delivery available at checkout
Shop all 156 productsBalloons to inflate

156 products

Decorating the venue yourself?

Our flat 21st balloons are sent ready to inflate at home or at the venue.

Shop flat 21st balloons

More for a 21st birthday

Decorations, themes and flat balloons

21 Helium Balloon

Discover our collection of 21st Birthday helium balloons. Find the perfect helium 21st birthday balloons and have them delivered. We have a great range of helium 21st birthday balloon in a box options too!

21st Balloons Helium

Looking to send a helium balloon surprise? Let our collection of 21st birthday balloons delivered be the perfect surprise gift. Our helium balloons make great decorations too! Making them ideal to send to a venue or to save sime and hassle of going to town to pick some up.

Enjoy free delivery on qualifying orders. If you need your 21st balloons delivered in a hurry, we offer Next Day delivery too!

Frequently asked questions

Can I buy the balloons flat to inflate myself?
Yes. Our 21st balloons to inflate are sent flat for you to fill. Everything here arrives inflated with helium.
What personalised 21st balloons do you have?
There are bubble balloons with a 21st balloon inside in gold, hot pink, baby blue and rose gold, plus star, confetti and greenery print designs. Personalisation is from £5 and bubble balloons last up to 14 days.
How many balloons are in a 21st balloon box?
Designs such as Rose Gold Holographic and Blue and Silver Holographic can be chosen with 1, 3, 5, 7 or 9 balloons. A 9 balloon bundle has the featured 21st balloon on top with 8 plain coloured balloons underneath.
Do you have giant 21 number balloons?
Yes, in gold, pink, blue, black, red, purple, green, navy blue, matte nude, rainbow and dotted designs. Choose giant numbers on their own or the package option.
What comes with the White and Gold 21st set?
It arrives inflated with helium and tied to ribbon and a weight, with a 34 inch giant balloon and 17 to 18 inch themed balloons.