transatlantic · 10h 30m · 8,132 km
Frankfurt to Denver
2 airlines · 2 aircraft ranked
In business class, Lufthansa's Allegris Business (A350-900) leads the field with a 7.7/10.In premium economy, Lufthansa's Allegris Premium Economy (A350-900) leads the field with a 5.4/10.
Quick pick
Fly Lufthansa. It scores higher across seat comfort and amenities.
If fares are comparable, this is the better cabin.
Fly Lufthansa. It scores higher across seat comfort and amenities.
If fares are comparable, this is the better cabin.
Fly Lufthansa. It has a bigger screen (13" vs 9").
If prices are similar, go with this one.
Select two airlines to compare head-to-head
Data verified June 2026
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Route insights
- In business class, Lufthansa's Allegris Business (A350-900) leads the field with a 7.7/10.
- In premium economy, Lufthansa's Allegris Premium Economy (A350-900) leads the field with a 5.4/10.
- In economy, Lufthansa's Allegris Economy (A350-900) leads the field with a 4.7/10.
Frequently asked
Which is better in business: Lufthansa or United on FRA-DEN?
Allegris Business (Lufthansa, A350-900) beats Polaris (United Airlines, 787-10) in business, scoring 7.7/10 vs 6.5. The deciding factor: AC + USB-C vs no power.
Which is better in premium economy: Lufthansa or United on FRA-DEN?
Allegris Premium Economy (Lufthansa, A350-900) edges out Premium Plus (United Airlines, 787-10) in premium economy, scoring 5.4/10 vs 4.5. The deciding factor: AC + USB-C vs no power. United Airlines fights back on seat width.
Which is better in economy: Lufthansa or United on FRA-DEN?
Allegris Economy (Lufthansa, A350-900) beats Economy (United Airlines, 787-10) in economy, scoring 4.7/10 vs 3.4. The deciding factor: USB-C only vs no power.
What are the best seats in Lufthansa Allegris Business on FRA-DEN?
Best: Bulkhead Suite seats in rows 2 and 8 have sliding doors and extra space — 8 of the 38 seats. "Extra Long Bed" variants offer up to 86 inches of bed length. Avoid: "Classic" seats in the center of each cabin section have less privacy than window positions. 38 staggered 1-2-1 seats across 5 sub-types: Suite (8 seats with doors), Extra Space, Privacy (window), Extra Long Bed, and Classic. 18-inch IFE standard, 24-inch on suites. 10-inch control tablet. AKG noise-canceling headphones. L'Occitane amenity kit. Wireless charging at every seat.
What are the best seats in Lufthansa Allegris Premium Economy on FRA-DEN?
Best: Window pairs offer the most privacy. Front row has bulkhead legroom. Avoid: Center block middle seat has no direct aisle access. 24 fixed-shell recliner seats. 15.6-inch IFE. Noise-canceling headphones included. Wireless charging in armrest. Part of the new Allegris cabin overhaul.
What are the best seats in Lufthansa Allegris Economy on FRA-DEN?
Best: Rows 19-20 and exit row 26 offer 34 inches of pitch. 9-abreast (3-3-3) is wider than 10-abreast on 777s. Avoid: Last rows near rear lavatories. Standard 31-inch pitch rows are tight for taller passengers. 201 Recaro economy seats in 9-abreast configuration — wider than typical 777 economy. Select front and exit rows offer 34-inch pitch. Part of the Allegris cabin overhaul.
What are the best seats in United Polaris on FRA-DEN?
Best: Window seats in odd rows (1A, 3A) are closer to the window with more privacy. Avoid: Even-row window seats are closer to the aisle. Same Safran Optima Polaris seat as 787-9 and 777-200ER. 16-inch IFE. Panasonic Ku-band wifi (paid). Saks Fifth Avenue bedding with mattress pad on request.
What are the best seats in United Premium Plus on FRA-DEN?
Best: Window pairs (2 across) avoid the center middle seat. Avoid: Center middle seat in the 3-section. 2-3-2 premium economy (smaller cabin than 777). 13.3-inch IFE with Bluetooth. Enhanced plated meals with alcohol.
What are the best seats in United Economy on FRA-DEN?
Best: Economy Plus rows offer 34-inch pitch vs standard 31-inch. Avoid: Last few rows near lavatories. 3-3-3 economy. 9-inch IFE. Economy Plus available for extra legroom. Panasonic Ku-band wifi (paid).