
Sending a letter to Australia can be done through various postal services, such as USPS, Royal Mail, and Australia Post. Each service offers different rates and delivery times, with prices starting from £3.10 or $1.65. Some services also offer tracking and signature on delivery. When sending a letter to Australia, it's important to follow the correct formatting and size guidelines, as well as any customs regulations.
| Characteristics | Values |
|---|---|
| Cost | From £3.10 |
| Delivery time | 5-7 working days for tracked, 6-7 working days for standard, 84 days for economy |
| Customs | Customs declaration form required, including a detailed description of the item(s) |
| Recipient details | Recipient contact details (email address and/or local phone number) |
| Size | No thicker than 5mm for small letters, 20mm for large letters |
| Shape | Rectangular |
| Address | Delivery address in English, with the country's name on the last line |
| Weight | Up to 1 oz for standard-sized letters and postcards |
| Compensation | Up to $100 compensation included, with additional charges for Extra Cover |
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What You'll Learn

International shipping services
Royal Mail (UK)
Royal Mail offers four services for sending mail to Australia, starting from £3.10. The International Economy service is the cheapest option, aiming to deliver within 84 days. The International Standard service aims to deliver within 6-7 working days, while the International Tracked service delivers within 5-7 working days. All items sent internationally from the UK need to have the relevant customs documents attached and electronic data provided.
Australia Post (Australia)
Australia Post offers various services for sending letters and parcels within Australia and internationally. For international shipping, they provide International Courier and International Express services, which require a CN23 customs form. The International Economy Air letters service can be posted at any Post Office or street posting box with the correct stamps applied. Australia Post also offers compensation for lost or damaged items during transit.
USPS (US)
USPS provides the First-Class Mail International® (FCMI) service, which is an affordable way to send letters and large envelopes to Australia. A Global Forever® stamp, which costs $1.65, is required for sending 1 oz letters or postcards. USPS has specific guidelines for international letter dimensions, addressing, and postage calculation.
It is important to note that different countries have varying rules and regulations for incoming mail, so it is essential to check the restrictions and requirements of the destination country before sending a letter or parcel to Australia.
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Customs forms and declarations
A customs declaration form is required for all parcels, International Courier letters, and International Express letters. You can complete your customs form online and then show your confirmation QR code when lodging your item at the Post Office. Alternatively, you can complete your online or paper customs form at the Post Office. For paper customs forms, the team will input your declaration details into the system when you lodge your item. You can also prepare your customs declaration in advance to save time at the Post Office.
The customs declaration form should include a clear and accurate description of the item being shipped. This description should be detailed and specific, indicating exactly what the item is and what it's made from. Each item must be clearly identified to ensure smooth clearance by customs.
Additionally, the customs declaration form requires an HS tariff number, which is an internationally recognised code that helps customs authorities assess which taxes, duties, and restrictions may apply to the shipment. The HS tariff number can vary from 6 to 10 digits and may differ between countries, even for the same product. This number is essential for all eCommerce shipments and gifts to ensure timely delivery and avoid unnecessary delays or returns.
It is important to note that providing incomplete or incorrect customs data and declarations may result in delays or non-delivery of your shipment. Therefore, ensure that you carefully review and accurately complete all the required customs forms and declarations when sending items to Australia.
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Size and weight restrictions
When sending a letter to Australia, it's important to be aware of the size and weight restrictions imposed by postal services. These restrictions can vary depending on whether you're sending a letter domestically within Australia or internationally from another country. Here are the size and weight restrictions you need to keep in mind:
Domestic Letters within Australia:
- Australia Post specifies that letters sent within Australia can only contain flexible items.
- For a small letter, the item should not be thicker than 5mm, while a large letter can be up to 20mm thick.
- To avoid small letters getting trapped in machinery, Australia Post recommends that the letter be larger than 88mm x 138mm.
- Sealed envelopes are preferred, but if posted unsealed, the opening should not exceed 88mm.
- Inflexible items such as keys, pens, and USBs should not be sent in regular paper envelopes as they can get damaged in sorting machines.
International Letters to Australia:
- When sending letters internationally to Australia, different postal services have their own size and weight restrictions.
- USPS, for example, allows international letters to be up to 11-1/2" long x 6-1/8" high.
- The contents of the envelope should be able to stay flat, with a maximum thickness of 1/4".
- Non-machinable items, such as lumpy or rigid envelopes or those with clasps, string, or buttons, will incur an additional charge of $0.46.
- USPS also specifies that all postcards, letters, and large envelopes must be rectangular; otherwise, an additional charge may apply.
- Standard postcards are typically made of thick paper (cardstock), measuring between 5-1/2" to 6" long and 3-1/2" to 4-1/4" high, and should not be more than 0.016" thick.
- Regardless of the postal service used, it's important to check their specific size and weight restrictions to ensure your letter can be delivered without issues.
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Prohibited and restricted items
When shipping a letter to Australia, it is important to be aware of the prohibited and restricted items that cannot be sent. Australia has strict customs guidelines and restrictions on certain goods and packaging materials to protect its natural environment, flora, and fauna. Here is a detailed list of prohibited and restricted items to consider:
Prohibited Items:
- Any shipment that has originated from or travelled through certain countries, such as Somalia, Egypt, or Bangladesh, is prohibited by Australian customs. This restriction is in place to prevent the potential introduction of diseases and pests that could harm Australia's unique ecosystem.
- Hazardous materials, including cigarettes and smokeless tobacco, are prohibited from being shipped to Australia.
- Letters and flats are restricted to only containing documents and cannot contain any other goods. This means you cannot include any items other than paper documents in your letter.
Restricted Items:
To ensure a smooth customs clearance process, it is essential to provide detailed and accurate customs data and declarations. Australia's Border Agency maintains a comprehensive list of restricted items, and some common gift items sent during holiday periods, such as Christmas, may be banned. It is crucial to review this list before shipping to ensure compliance with Australian customs regulations.
Packaging and Shipping Guidelines:
When shipping to Australia, ensure that your package complies with the following guidelines:
- Complete the necessary customs paperwork, including a detailed, itemized description of the contents.
- Attach the relevant customs documents and provide electronic customs data.
- Include recipient contact details, such as an email address and local phone number, to facilitate communication in case any issues arise.
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Cost of postage
The cost of postage for letters sent within Australia is determined by their size, thickness, and weight. The delivery speed, origin, and destination of the letter also influence the postage cost. Australia Post offers Regular, Priority, and Express Post services for sending letters within the country.
For letters exceeding the maximum size and weight limits, or containing inflexible items like keys, pens, or USBs, a parcel service should be used. Australia Post provides an online calculator to estimate postage prices and delivery times for letters within Australia. Users need to select 'Australia' and input the 'from' and 'to' postcodes, then choose 'Letters' for accurate estimates.
To send a letter with tracking or registered post, you must lodge it over the counter at a Post Office to obtain proof of posting. The cost of postage for letters sent within Australia differs from international postage rates.
When using red street posting boxes, ensure you affix the correct postage to your items. Australia Post may invoice you for the postage difference and charge an additional admin fee if your mail is posted with insufficient postage.
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Frequently asked questions
Delivery times vary depending on the delivery speed you choose, the size of your letter, and where you’re sending it from and to. Royal Mail's International Tracked service aims to deliver letters to Australia in 5-7 working days, while the International Standard service aims to deliver within 6-7 working days.
The cost of shipping a letter to Australia depends on the service you choose. Royal Mail offers services starting from £3.10 for parcels that don't need to arrive quickly. For shipping from the US, the First-Class Mail International service is the most affordable option, with a Global Forever stamp costing $1.65.
Australia Post specifies that letters sent within Australia can be up to 5mm thick for small letters and up to 20mm thick for large letters. If your letter exceeds these dimensions, it will be considered a parcel. For international letters, USPS specifies that envelopes should be rectangular and no more than 11-1/2" long x 6-1/8" high x 1/4" thick to qualify for letter prices.
All items sent internationally to Australia need to have the relevant customs documents attached and electronic data provided. This includes a detailed, itemised description of the item(s) being sent. If you are shipping from the US, you only need a customs form if you are sending restricted, prohibited, or hazardous materials, or items with commercial value.
When addressing a letter to Australia, write your address (the "return address") in the top-left corner of the envelope. Write the delivery address in English in the centre, near the bottom of the envelope. Include the destination country's name (Australia) on the last line.









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