Which has the bigger carry-on allowance, Allegiant or Sun Country?

Allegiant: 22 × 16 × 10 in (56 × 41 × 25 cm). Sun Country: 24 × 16 × 11 in (61 × 41 × 28 cm), up to 35 lb (15.9 kg). Sun Country allows the larger bag.

Do Allegiant and Sun Country include a carry-on on basic economy?

Allegiant: Fares include only a personal item. A carry-on is a paid add-on, cheapest at booking. Sun Country: Fares include only a personal item. Buying a carry-on early is cheapest.

Are Allegiant and Sun Country partners?

They aren't in the same alliance (Allegiant: none; Sun Country: none), so miles and status generally don't transfer between them.

G4 vs SY · 2026 comparison

Allegiant vs Sun Country

Allegiant wins on a more generous carry-on weight limit and cheaper checked bags; Sun Country wins on a bigger carry-on and a bigger personal item. Here's how they compare on bags, fees, comfort, reliability and loyalty.

Verified Oct 17, 2026By Steven MoHow we check Report a correction

Allegiant

Wins 2 categories

A more generous carry-on weight limit
Cheaper checked bags

Sun Country

Wins 2 categories

A bigger carry-on
A bigger personal item

Quick verdict

Allegiant wins on a more generous carry-on weight limit and cheaper checked bags; Sun Country wins on a bigger carry-on and a bigger personal item. Check the cheapest fare's bag rules before you compare prices.

Carry-on size: Allegiant: 22 × 16 × 10 in · Sun Country: 24 × 16 × 11 in
Carry-on on the cheapest fare: Allegiant: Costs extra on basic fares · Sun Country: Costs extra on basic fares
First checked bag (regular economy): Allegiant: $20–$50 · Sun Country: $34–$45

Side by side

	Allegiant	Sun Country
Bags
Carry-on size	22 × 16 × 10 in	24 × 16 × 11 in
Carry-on on the cheapest fare	Costs extra on basic fares	Costs extra on basic fares
Carry-on weight limit	None published	35 lb (15.9 kg)
Personal item	7 × 15 × 16 in	17 × 13 × 9 in
First checked bag (regular economy)	$20–$50	$34–$45
Network
Alliance	None	None
Loyalty program	Allways Rewards	Sun Country Rewards
Main hubs	LAS, SFB, PIE, AZA	MSP

Highlighted values are better for travelers. Fees are for U.S. domestic economy flights; on-time data is 2025 U.S. DOT figures for each airline's own flights.

Bags and fees

Allegiant allows a carry-on up to 22 × 16 × 10 in (56 × 41 × 25 cm), and Sun Country up to 24 × 16 × 11 in (61 × 41 × 28 cm), so Sun Country's is roomier.

Allegiant charges for it on its cheapest fare, while Sun Country charges for it on its cheapest fare.

Sun Country caps carry-ons at 35 lb (15.9 kg); Allegiant publishes no limit.

Personal items: 7 × 15 × 16 in (18 × 38 × 41 cm) on Allegiant, and 17 × 13 × 9 in (43 × 33 × 23 cm) on Sun Country.

A first checked bag on Allegiant costs $20–$50 on all Allegiant flights, and a first checked bag on Sun Country costs $34–$45 on all Sun Country flights.

Basic economy

Allegiant (Base fare): Fares include only a personal item. A carry-on is a paid add-on, cheapest at booking.

Sun Country (Best fare): Fares include only a personal item. Buying a carry-on early is cheapest.

Loyalty and where they fly

Allegiant is not in an alliance and Sun Country is not in an alliance.

Loyalty programs: Allways Rewards (Allegiant) and Sun Country Rewards (Sun Country).

Allegiant's main hubs are Las Vegas (LAS), Orlando Sanford (SFB), St. Petersburg–Clearwater (PIE), Phoenix–Mesa (AZA). Sun Country's are Minneapolis (MSP). The best choice often comes down to which airline flies nonstop from your airport.

Which should you book?

Choose Allegiant if you want…

a more generous carry-on weight limit
cheaper checked bags
nonstops from LAS, SFB, PIE

Choose Sun Country if you want…

a bigger carry-on
a bigger personal item
nonstops from MSP

On a route both fly, the cheaper ticket isn't always the cheaper trip: add the bags you'll actually bring, and check the fare rules before you book.