Costa Flat White (UK Price & Calories 2026)
The Flat White is a coffee-forward choice crafted to highlight the rich espresso base, offering a true taste experience that coffee lovers appreciate. Unlike milk-forward drinks, the milk in a Flat White is expertly textured microfoam, which gently complements but does not overpower the coffee’s bold character. This balance ensures each sip delivers a strong coffee presence, with a velvety texture from the microfoam for a smooth finish.
Priced at £4.35 for a small size, this beverage offers a manageable calorie intake of 136 kcal per 300 ml serving. The energy value reaches 574 kJ, making it a satisfying but not overly heavy option. Those who need to be mindful about allergens should note that this drink contains milk, which is a key part of its creamy texture and taste.
The microfoam texture adds a subtle creaminess that enhances the mouthfeel without tipping the drink into milk-dominant territory. This makes the Flat White ideal for anyone seeking a coffee experience that lets the espresso shine through, while still enjoying a smooth, textured milk layer.
| Nutrient | Per 100g | Standard (300ml) |
|---|---|---|
| Energy (kcal) | 63 | 189 |
| Energy (kJ) | 262 | 787 |
| Carbs (g) | 4.7 | 14.1 |
| Sugars (g) | 4.1 | 12.2 |
| Fat (g) | 3.6 | 10.7 |
| Saturates (g) | 2.3 | 6.8 |
| Protein (g) | 3.2 | 9.6 |
| Salt (g) | 0.1 | 0.3 |
Customize Your Signature Drink
Tailor the size, milk, and flavors to your preference and check the nutritional information
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Quick takeaways for your Flat White choice
- Cheapest size available: Small at £4.35
- Calorie content for Small: 136 kcal per 300 ml portion
- Energy for Small size: 574 kJ
- Contains milk: important for those with allergies to check
- Customisation available with milk alternatives and extras, impacting price and nutrition
The cost and value of your Flat White
The Flat White is offered in a single size option in this lineup, with the small size priced at £4.35. This straightforward pricing means you know exactly what to expect without size variations. Should you choose to customise with milk alternatives or add extras, the price adjusts accordingly based on your selections.
The nutritional profile that balances coffee and creaminess
This Flat White comes in a 300 ml portion, providing a balanced nutritional profile that supports the coffee-forward nature of the drink. Below you will find the exact nutritional breakdown for the small size:
| Size | Portion (ml) | Energy (kcal) | Energy (kJ) | Sugar (g) | Fat (g) | Saturates (g) | Carbs (g) | Protein (g) | Salt (g) |
| Small | 300 | 136 | 574 | 12.7 | 4.7 | 2.9 | 14.6 | 10.2 | 0.32 |
Allergens to check before you order your Flat White
For those with allergies or dietary restrictions, it is important to understand the allergen content in your Flat White. Here are the specifics:
- Milk: Contains
This means the Flat White contains milk and is not suitable for those with a milk allergy or intolerance unless customised with alternatives. Always consider cross-contact risks in shared environments when ordering.
Customising your Flat White: balancing flavour and nutrition
While the core Flat White emphasises a coffee-first experience with smooth microfoam milk, you can customise the milk to suit your preferences or dietary needs. Each milk alternative changes both the price and the nutritional profile of the drink:
- Oat milk: Adds £0.45 and increases energy by 35 kcal (+143.1 kJ), raises fat by 3.5 g, reduces sugar by 3.8 g, lowers saturates by 2 g, adds carbs by 5.4 g, reduces protein by 7.3 g, and slightly increases salt by 0.06 g.
- Coconut milk: Adds £0.45 and decreases energy by 38 kcal (-159.3 kJ), lowers fat by 0.8 g, reduces sugar by 3.8 g, lowers saturates by 0.9 g, reduces carbs by 3.7 g, lowers protein by 5.4 g, and reduces salt by 0.02 g.
In addition, you can choose from a variety of extras and syrups to enhance your Flat White. These add to the price but do not affect the nutrition values provided here:
- Extras: Extra espresso shot (+£0.80), Light whip (+£0.50), Marshmallows (+£0.50), Whipped cream (+£0.60)
- Syrups: Caramel, Vanilla, Hazelnut, and several sugar-free options (+£0.60 each)
Understanding the microfoam texture and coffee balance in your Flat White
The signature microfoam of the Flat White is what sets it apart from other espresso-based drinks. This finely textured milk creates a creamy yet light layer that enhances the coffee’s robust flavour without overwhelming it. The silky foam maintains the coffee’s clarity and intensity, reinforcing the coffee-forward philosophy of the drink.
Whether you choose to stick with classic milk or try oat or coconut milk, the texture remains integral to the Flat White experience. The milk alternatives subtly shift the nutritional content while preserving the smooth mouthfeel that supports the coffee’s bold personality.
Tips for ordering your perfect Flat White
- To enjoy the authentic coffee-forward taste, select the standard milk or one of the milk alternatives that complement your dietary needs.
- Adding an extra espresso shot intensifies the coffee flavour further but increases the price.
- Choose oat milk if you want to add creaminess and calories, or coconut milk for a lighter nutritional profile.
- Be mindful of allergens, especially milk content, if you have allergies or intolerances.
- Extras and syrups raise the cost and can modify the flavour, but be aware they do not impact the core nutritional values listed.
Frequently Asked Questions
Disclaimer
Prices shown are typical UK menu estimates for 2026 and may vary by store location, promotions, delivery services, or eat-in vs takeaway pricing. Nutritional values are based on standard drink configurations and may change depending on size, milk choice, extras, or recipe updates made by the brand.