Under 50 lb
Only the standard bag fee applies on either airline. A light case with the wheels off is the one configuration that reliably lands here.
Bikes, by air
What airlines charge to fly with a bike
Two US airlines were checked directly on 2026-08-21, and they land in almost the same place by two different routes. Southwest names sporting equipment and waives its oversize fee up to 115 inches; Delta simply sets a bike's own size ceiling at 115 inches and lets it ride as an ordinary checked bag under that line. Both start charging real money once a case passes 50 lb, in matching 100 USD and 200 USD bands. What neither one tells you is what shipping the same case would have cost instead — this site has already priced that part.
Two airlines, checked live 2026-08-21Weighed against shipping insteadBoth fee schedules dated
Two airlines, one shape
A cased bike is an oversized bag to both. The fee only changes once weight enters the picture.
Southwest and Delta, side by side
Both schedules were read directly from each airline's own site on 2026-08-21. The base checked-bag fee is nearly identical on both; where they differ is how each one talks about the bike's size.
| Item | Southwest | Delta |
|---|---|---|
| First checked bag, current fare | 45 USD | 45 USD |
| Second checked bag, current fare | 55 USD | 55 USD |
| Bike's size ceiling before it stops being a standard bag | 115 in, oversize fee waived under that line | 115 in, or the bike is not accepted |
| 51–70 lb | +100 USD | +100 USD |
| 71–100 lb | +200 USD | +200 USD (71–99 lb; 100 lb+ refused) |
| Container requirement | Falls under Southwest's general sporting-equipment exception | Durable container built for a bicycle; release form if it is not a hard-shell case |
The two airlines reach the same practical number through different language. Southwest frames its rule as an explicit waiver of an oversize fee that would otherwise apply from 63 inches up. Delta does not describe a waiver at all — it simply defines 115 inches as the size a bike is allowed to be as a checked bag, with nothing beyond it accepted. Either way, a well-packed case under roughly six feet and under 50 lb travels for the price of an ordinary checked bag on both.
Where the weight bands actually bite
Neither airline's own page ties its overweight fee to sporting equipment specifically at the 51–70 lb step; both apply the same schedule they use for an ordinary heavy suitcase. A full-suspension mountain bike in a padded hard-shell case is the item most likely to cross into it, since the case alone often runs 10 to 15 lb before the bike goes in.
51 to 70 lb
Both airlines add 100 USD on top of the standard fee, per their own pages read 2026-08-21. A steel-frame commuter bike in a hard case with tools and pedals still attached tips into this band easily.
71 lb and up
Both add 200 USD. Delta stops accepting a bike entirely at 100 lb; Southwest's published band tops out at 100 lb without stating what happens past it, so calling the airline directly is the safer move at that weight.
None of this is judged by eye at the counter. Both airlines weigh what is handed over, so the number that decides the fee is the case loaded and closed, not the bike alone on a home scale.
Checking it against shipping it instead
An airline's fee schedule is one flat set of tiers. Shipping a boxed or cased bike through a parcel carrier prices from the box and the route instead, and this site has already run three real configurations worth setting next to the airline numbers above.
Hard-shell travel case
$213.11
Captured 2026-08-19. Full route and box detail on the bicycle shipping case guide.
Fully assembled crate
$211.09
Captured 2026-08-19. Full route and box detail on the assembled vs. wheels-off guide.
Wheels off, cardboard box
$96.76
Captured 2026-08-18, on the same assembled-vs-wheels-off guide linked above.
None of the three figures above are a fresh capture for this page; each was pulled from the guide that already priced it, on the date shown there. Set next to the airline figures higher up, the lightest of the three usually wins in the air: a wheels-off box under 50 lb rides for the price of a standard checked bag on either Southwest or Delta, well under its own $96.76 shipped price. The comparison flips once the case gets heavy. A hard-shell case loaded past 70 lb picks up a 200 USD airline surcharge on top of its own 45 or 55 USD bag fee — call it 245 to 255 USD each way on fees alone — against a one-way shipped price in the low two-hundreds that a parcel carrier will not raise again once the label is bought. Weigh the specific case loaded, then price both directions before deciding which way the bike travels.
Where these figures come from
- Southwest Airlines, Optional Travel Charges — checked-bag fees and the sporting-equipment oversize waiver to 115 inches and overweight bands. Read 2026-08-21.
- Delta Air Lines, Flying With Sports Equipment — the bicycle's 115-inch and 50 lb figures and the protective-container requirement. Read 2026-08-21.
- Delta Air Lines, Excess & Overweight Baggage — the general overweight fee bands. Read 2026-08-21.
- Delta Air Lines, Baggage Policy and Fees — the first and second checked bag fees. Read 2026-08-21.
- Prices: this site's own captures against production, cited with their original dates above, from Assembled vs. wheels-off and Bicycle shipping case.
Airline fee schedules change by fare, route and date without much notice, and a specific airline's counter agent has the final say on anything unusual. Treat the figures above as what each airline published on the date shown, and confirm before you fly.
Common questions
Do airlines charge extra to check a bike?
Not for size alone, on the two airlines checked here. Southwest and Delta both let a boxed or cased bike travel as a standard checked bag up to 115 inches without an oversize fee, per each airline's own page read 2026-08-21. A rider still pays whatever checked-bag fee applies to that flight — 45 USD for a first bag on either airline at the figures in effect on that date.
What does a heavy bike case cost past the weight limit?
Weight, not size, is where both airlines actually add money. Southwest adds 100 USD for a case 51 to 70 lb and 200 USD for 71 to 100 lb, on top of the standard bag fee. Delta's overweight schedule charges the same 100 USD and 200 USD at matching 51-70 and 71-99 lb bands, and will not accept a bike at 100 lb or heavier at all. Both figures read from each airline's own site, 2026-08-21.
Does a bike need a special box or case to fly?
Delta's own sporting equipment page states a bicycle must be packed in a durable protective container designed specifically for bicycles, and requires a signed release form unless it travels in a hard-shell case built for that purpose. Southwest's waiver is written around sporting equipment generally rather than naming bikes, but a bare frame with nothing around it is not what either exception was built for.
Is it cheaper to ship the bike instead of flying with it?
It depends on the case and the fare. This site's own captures have priced a wheels-off cardboard box at $96.76, a fully assembled crate at $211.09, and a hard-shell travel case at $213.11. A light case under 50 lb that clears both airlines' size waiver can beat every one of those once only the standard bag fee is added; a heavy hard-shell case sitting in the 100 USD or 200 USD overweight bands is where the shipped prices start to look competitive instead.
What does Delta charge for a first checked bag?
45 USD for a first standard checked bag under 50 lb, and 55 USD for a second, on domestic US flights, per delta.com read 2026-08-21 — the same figure Southwest currently charges for its own first bag, before either airline's size or weight add-ons for a bike apply.