Hard case. The most protection. Also the heaviest, often 8–12 kg (18–26 lb) empty, which makes it easier to go over the 50 lb limit.
Soft or padded bike bag. Lighter and easier to carry and store. Pad the frame well. Iberia charges extra for soft bags, $150 each way to the US.
Cardboard bike box. Often free from bike shops, light, and you can leave it behind. Least protection, and it doesn't like rain. Some airlines sell boxes at the airport: Air France (most check-in counters), Iberia (€20), KLM (Amsterdam) and Swiss (free at Zurich and Geneva).
2. Keep it under 50 lb (23 kg)
Most airlines charge an overweight fee above 50 lb, often $100 each way. Weigh the packed bag at home.
Move heavy things to your suitcase: shoes, helmet, pump, tools, bottles and spares.
Most airlines won't take anything over 70 lb (32 kg). Transavia, Norwegian and Norse cap bikes at 23 kg.
3. Check the size
Most bike bags and boxes are fine on big airlines. Delta and United take bikes up to 115 inches (length + width + height), and American doesn't charge oversize fees for bikes.
A few are stricter: British Airways allows 190 × 95 × 65 cm, Virgin Atlantic 190 × 75 × 65 cm, and TAP charges extra for anything over 62 inches.
4. Pack the bike
Take off the pedals.
Turn the handlebars sideways, or take them off the stem.
Let some air out of the tires. British Airways and Virgin Atlantic ask for this.
Protect the rear derailleur: take it off the hanger and tape it to the frame, or use a hanger guard.
With the wheels out, put spacers in the fork and rear dropouts so the frame can't be crushed.
Wrap the frame tubes in foam or pipe insulation.
Bag small parts like pedals and thru-axles, and tape them inside.
Put your name and phone number inside and outside the bag.
Most airlines won't carry e-bike batteries.
Gear that helps
EVOC Road Bike Bag Pro. A soft bag with a built-in frame. Strong protection without hard-case weight.
Thule RoundTrip Traveler. A padded soft case in the same style as the EVOC, from a big brand with wide store support.
Orucase Airport Ninja. Small enough to count as a regular-size checked bag on many airlines, which helps on strict ones like TAP.
A cardboard bike box from your local bike shop. Usually free, and you can leave it behind.
Fly it or ship it?
If your airline charges $150 or more each way, shipping can cost about the same and skips the oversize bag drop. Get a quote from BikeFlights and compare it with your airline's bike fee.
5. Before you fly
Register the bike if your airline asks: British Airways and Lufthansa 3 days ahead, Edelweiss 4 days, Air France and KLM 2 days, SAS 1 day, Condor 8 hours.
Add the bike when you book if your airline charges for it. It's usually cheapest then (Iberia, Ryanair, Condor, Norse).
Get to the airport early. Bikes go to the oversize bag drop, and British Airways asks for 3 hours before long-haul flights.
6. When you land
Check the bag before you leave the airport.
If it's damaged, take photos and report it at the airline's baggage desk right away. On international flights you have 7 days to file a written damage claim.
Quick answers
How do I pack a bike for a flight?
Take off the pedals, turn the handlebars sideways, let some air out of the tires, protect the rear derailleur, put spacers in the fork and frame, wrap the tubes in foam, and keep the packed bag under 50 lb (23 kg).
What's the best bag for flying with a bike?
A hard case protects best but weighs the most. A padded soft bag is lighter and easier to carry. A cardboard bike box is cheap or free from bike shops and light, but protects least. Pick the lightest one that protects your bike well enough, so the total stays under 50 lb.
How much can a bike bag weigh on a plane?
Most airlines charge an overweight fee above 50 lb (23 kg), often $100 each way, and won't take anything over 70 lb (32 kg). Some, like Transavia and Norwegian, cap bikes at 23 kg.
What should I do if my bike is damaged on a flight?
Check it before you leave the airport. If it's damaged, take photos and report it at the airline's baggage desk right away. Under the Montreal Convention you have 7 days to file a written damage claim on international flights.