domestic · 2h 35m · 1,420 km
Austin to Denver
3 airlines · 3 aircraft ranked
In economy, United's Economy (737-900ER) edges out the field with a 4.2/10.United is the only carrier offering first class on this route, scoring 2.8/10.
Quick pick
Fly United. It scores higher across seat comfort and amenities.
If prices are similar, go with this one.
Select two airlines to compare head-to-head
Data verified June 2026
Find your flight
New routes and airlines added regularly. One short email when we do.
Airlines on this route
Flying with family
- Seatback screens on United. Southwest, Frontier: bring your own device.
- Most legroom: Southwest (32"). Least: Frontier (28"). That 4" difference matters with kids.
Route insights
- In economy, United's Economy (737-900ER) edges out the field with a 4.2/10.
- United is the only carrier offering first class on this route, scoring 2.8/10.
Frequently asked
Which is better in economy: United or Southwest on AUS-DEN?
Economy (United Airlines, 737-900ER) edges out Economy (open seating) (Southwest Airlines, 737-800) in economy, scoring 4.2/10 vs 3.9. The deciding factor: AC + USB-C vs USB-A only. Southwest Airlines fights back on legroom and seat width.
Which is better in economy: United or Frontier on AUS-DEN?
Economy (United Airlines, 737-900ER) dominates Economy (Frontier Airlines, A320neo) in economy, scoring 4.2/10 vs 2.2. The deciding factor: a 10" screen vs none. Frontier Airlines fights back on seat width.
Which is better in economy: Southwest or Frontier on AUS-DEN?
Economy (open seating) (Southwest Airlines, 737-800) beats Economy (Frontier Airlines, A320neo) in economy, scoring 3.9/10 vs 2.2. The deciding factor: 32" of pitch vs 28". Frontier Airlines fights back on seat width.
What are the best seats in United United First on AUS-DEN?
Best: Row 1 has the most legroom as a bulkhead. 1A and 1F offer the most privacy with the wall on one side. Row 2 is the sweet spot between legroom and storage (bulkhead rows lack under-seat storage). Avoid: Row 5 seats 5A/5B do not recline; 5E/5F have roughly half the recline of other First rows. This is the biggest seat trap on the 737-900ER. Signature Interior with Collins Aerospace Pinnacle seats, 13-inch HD seatback touchscreens with Bluetooth audio, USB-A and USB-C at every seat plus AC outlet. Complimentary meal service on flights over 800 miles; snack basket on shorter flights. ViaSat Ka-band WiFi free for MileagePlus members. Starlink awaiting FAA certification for 737-900ER, expected during 2026. Majority of fleet retrofitted to Signature Interior; some older aircraft remain.
What are the best seats in United Economy on AUS-DEN?
Best: Exit row 21 has 38.8 inches of pitch — more than First Class. The 2-seat side rows 20-21 are the best economy seats on the plane. Rows 7-14 are Economy Plus with 33-34-inch pitch. Avoid: Last row (row 33) has severely limited or no recline due to the rear lavatory wall. Rows 32-33 experience galley noise and lavatory traffic. Middle seats (B, E) in any row are the tightest at 30-inch pitch. Signature Interior with 10-inch HD seatback touchscreens and Bluetooth audio. USB-A and USB-C at every seat plus shared AC outlets. ViaSat Ka-band WiFi free for MileagePlus members. 42 Economy Plus seats in rows 7-14 have 33-34-inch pitch; 117 standard Economy seats have 30-inch pitch. Three sub-variants exist (39/42/45 Economy Plus seats); Version 2 with 42 E+ is most common (~84 of ~99 aircraft).
What are the best seats in Southwest Economy (open seating) on AUS-DEN?
Best: 16A and 16F have the most legroom (no seat in front, behind exit row). Row 12 exit row seats also have extra legroom. Avoid: Last row (row 29) is narrower, restricted recline, near galley/lavatory noise. Seats 10A, 11A, 11F lack windows. Single-class cabin. Assigned seating launched Jan 2026. Extra legroom rows at front have ~34 inch pitch. Older 737-800s lack power outlets; newer retrofits have USB-A and USB-C in seatbacks. Streaming entertainment via personal devices only. Exit row seats on the 737 offer extra legroom but do not recline. The row immediately before the exit also has limited recline due to clearance requirements.
What are the best seats in Frontier Economy on AUS-DEN?
Best: Exit row seats for extra legroom without paying for Stretch. Avoid: Last row has no recline and lavatory proximity. All middle seats are uncomfortable at 28-inch pitch. 28-inch pitch ties Spirit for the tightest in the US industry. No wifi, no power outlets, no seatback screens, no streaming entertainment. Tray tables are approximately 50% smaller than standard. All food and beverages are buy-on-board. Individual air nozzles and overhead reading lights are available. Exit row seats on the A320/A321 family offer extra legroom but do not recline. The row immediately before the exit also has limited recline due to clearance requirements.