BRITISH AIRWAYS T-355 Days Calculator

Reward flight availabilty booking date calculator

Book at T-355 days to maximise access to Premium Award Seats

BA releases award seats 355 days before departure at midnight GMT (1am BST in summer). Business and First Class sell out in minutes.

This free calculator tells you exactly when to call and adds a reminder to your calendar so you don't miss it.

📅 Your Booking Timeline

Travel Date:

Availability Appears:

(354 days before travel)

🎯 CALL BA ON:

Days Until Call Date:

How the 355-day rule works: BA releases award availability at exactly midnight GMT, 355 days before departure (so actually 354 days!). During British Summer Time (late March to late October), this means seats appear at 01:00 BST instead of midnight. The calculator automatically adjusts the call time based on whether BST is in effect.

📋 How to book the reward flights you want:

  • GMT (Standard Time): Call at 23:50 the evening before, seats appear at 00:00
  • BST (Summer Time): Call at 00:50, seats appear at 01:00 same night
  • Stay on hold - don't hang up, you want to be connected when the seats drop
  • Have BA Executive Club number ready: 0344 493 0787 (UK) or +44 203 250 0145 (international)
  • Have your Executive Club membership number, dates, routes, and cabin class ready
  • Alternatively: Try logged into ba.com, but calling is often faster and phone agents can hold the tickets for you

💡 Pro Tips

  • Premium cabins (Business/First) disappear within minutes on popular routes
  • Calling is usually faster than the website - you'll be connected to an agent at midnight
  • Set multiple alarms for 23:40 UK time so you don't miss the call window
  • Have alternative dates ready (±1-2 days) in case your first choice is taken
  • Partner airlines' availability on BA metal may appear at different times
  • Book one-way tickets for flexibility in mixing airlines. And be aware that your return ticket availability will be released later so you might have to call back a few days later, depending on the length of your trip!
  • Critical: Convert to UK time correctly if calling from abroad!

Privacy Policy

Last Updated: October 2025

1. Introduction

This Privacy Policy explains how we collect, use, and protect your information when you use the BA T-355 Booking Calculator ("the Service").

2. Information We Collect

Information You Provide: When you use our calculator, you enter travel dates. This information is processed locally in your browser and is not transmitted to our servers or stored permanently.

Automatically Collected Information: We may collect standard web analytics data including IP addresses, browser type, device information, and pages visited through cookies and similar technologies.

We don't collect any other personally identifiable information.

3. How We Use Your Information

We use the information we collect to:

4. Cookies and Tracking

We use cookies and similar tracking technologies for:

You can control cookies through your browser settings. Note that disabling cookies may affect website functionality.

5. Third-Party Services

Google Analytics: We use Google Analytics to understand how visitors use our site. Google Analytics uses cookies to collect anonymous information.

6. Data Storage and Security

Your travel date calculations are processed locally in your browser and are not stored on our servers. We implement reasonable security measures to protect any data we do collect.

7. Your Rights

Depending on your location, you may have rights including:

8. Children's Privacy

Our Service is not intended for children under 13. We do not knowingly collect information from children under 13.

9. Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page and updating the "Last Updated" date.

10. Contact Us

If you have questions about this Privacy Policy, please contact us at: hello@t355calculator.com

11. International Users

This website is operated from the United Kingdom. If you are accessing from outside the UK, please be aware that your information may be transferred to, stored, and processed in the UK.