What is the 3-1-1 Rule on Delta Airlines?
When packing for a Delta flight, the liquids rule can feel to be rocket science. One wrong item in your carry-on, & Boom! You end up tossing it at security. The 3-1-1 rule is what the TSA uses to control liquids on flights—and yes, Delta follows it. So, whether you’re flying economy or international, it helps to know the basics. This guide by FlyoStudio breaks it down in plain language—no jargon, no confusion.
What is the 3-1-1 Rule on Delta Airlines Economy?
On Delta economy, the 3-1-1 rule still applies to every passenger. It doesn’t change based on ticket class. Each passenger is allowed to bring liquid containers up to 3.4 ounces (100 milliliters). All of them must fit inside a single, clear, zip-top bag that holds no more than one quart. That’s where the 3-1-1 name comes from: 3.4 oz, 1 bag, 1 person.
Doesn't matter if you're carrying hand sanitizer, lip gloss, or cologne—it all counts. Don’t toss five bottles into your bag and hope for the best. Everything must fit. The bag should be sealed and easy to pull out during screening.
Don’t bury it under layers of clothes. TSA won’t dig it up for you.
What is the 311 Rule on Delta Airlines International Flights?
Nothing changes when you fly Delta internationally. The 3-1-1 rule on Delta Airlines international flights works the same. Same ounces. Same one-quart bag. Same inspection process. It’s enforced before boarding any flight departing the U.S. The carry-on liquid limit stays at 3.4 ounces per container.
Now, be careful on return trips. Some international airports may have slightly different screening rules. Always check the airport website before flying back. But as long as you’re departing from the U.S., or connecting through a U.S. airport, the TSA 311 rule for Delta Airlines will be enforced. Keep that quart bag ready at all checkpoints.
For any confusion mid-trip, call Delta at 1-800-221-1212 or 1-844-414-9223 to get help directly from their team.
TSA 311 Rule for Delta Airlines: How Strict is it really?
Pretty strict. TSA agents won’t let you through with oversized containers—even if they’re almost empty. Don’t carry a 6 oz sunscreen bottle with just one ounce left. If the label says more than 3.4 oz, they’ll toss it. It’s not about what’s inside—it’s about the original size.
Medications and baby formula are exceptions. You can carry those beyond the 3.4 oz limit, but you must declare them at the checkpoint. They will likely be screened separately. Still, if you’re carrying regular liquids, stick to the Delta carry on liquids rule: 3.4 oz, 1 clear quart-size bag, 1 per traveler.
Delta Carry on Liquids Rule: Extra Tips
Don’t rely on guessing. If you’re unsure about a product, check the size printed on the container. Use travel-sized items only, and make sure they’re sealed tight. Avoid packing large toiletries altogether—pick them up at your destination instead.
And don’t forget: any liquid items bought after the security check (like from airport shops) can be carried onboard freely, even if they’re above 3.4 oz.
For a quick double check or last-minute doubt, call Delta at 1-800-221-1212 or 1-844-414-9223 and ask them directly. It’s better than losing a good product at the gate.
The 3-1-1 rule doesn’t change with airline class or destination. It’s about liquid limits, not who you are or where you’re going. If you’re flying Delta, you’ll need to follow this rule to get through TSA without losing items. Pack smart. Check labels. Use that one zip bag wisely. Stick to the rule, and you’ll clear security without a second look. Now that you know how the TSA 311 rule for Delta Airlines works, you’ll be ready to pack smart and avoid last-minute stress. For more practical flying tips, call FlyoStudio or Delta at 1-800-221-1212 or 1-844-414-9223. We’ll keep it clear, real, and useful.