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

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

Where do Frontier and Sun Country fly from?

Frontier's main hubs are Denver (DEN). Sun Country's are Minneapolis (MSP). The better pick is often whichever flies nonstop from your airport.

Are Frontier and Sun Country partners?

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

F9 vs SY · 2026 comparison

Frontier vs Sun Country

Q: Do Frontier and Sun Country include a carry-on on basic economy?

Frontier: The Basic fare includes only a personal item. Add a carry-on when you book; it costs the most at the gate. Sun Country: Fares include only a personal item. Buying a carry-on early is cheapest.

Frontier wins on cheaper checked bags; Sun Country wins on a bigger carry-on. Here's how they compare on bags, fees, comfort, reliability and loyalty.

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

Frontier

Wins 1 category

Cheaper checked bags

Sun Country

Wins 1 category

A bigger carry-on

Quick verdict

Frontier wins on cheaper checked bags; Sun Country wins on a bigger carry-on. Check the cheapest fare's bag rules before you compare prices.

Carry-on size: Frontier: 24 × 16 × 10 in · Sun Country: 24 × 16 × 11 in
Carry-on on the cheapest fare: Frontier: Costs extra on basic fares · Sun Country: Costs extra on basic fares
First checked bag (regular economy): Frontier: $29–$63 · Sun Country: $34–$45

Side by side

	Frontier	Sun Country
Bags
Carry-on size	24 × 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	35 lb (15.9 kg)	35 lb (15.9 kg)
Personal item	18 × 14 × 8 in	17 × 13 × 9 in
First checked bag (regular economy)	$29–$63	$34–$45
Network
Alliance	None	None
Loyalty program	FRONTIER Miles	Sun Country Rewards
Main hubs	DEN	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

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

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

Carry-on weight limits: 35 lb (15.9 kg) on Frontier, 35 lb (15.9 kg) on Sun Country.

Personal items: 18 × 14 × 8 in (46 × 36 × 20 cm) on Frontier, and 17 × 13 × 9 in (43 × 33 × 23 cm) on Sun Country.

A first checked bag on Frontier costs $29–$63 on all Frontier flights, and a first checked bag on Sun Country costs $34–$45 on all Sun Country flights.

Basic economy

Frontier (Basic): The Basic fare includes only a personal item. Add a carry-on when you book; it costs the most at the gate.

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

Loyalty and where they fly

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

Loyalty programs: FRONTIER Miles (Frontier) and Sun Country Rewards (Sun Country).

Frontier's main hubs are Denver (DEN). 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 Frontier if you want…

cheaper checked bags
nonstops from DEN

Choose Sun Country if you want…

a bigger carry-on
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.