--- title: "Houston (IAH) to Louisville (SDF) flights: who flies it" description: "American Airlines and United Airlines fly nonstop from IAH to SDF, about 22 flights a week. See confirmed upgrade and award space by date on 2LNR, the next 14 days free." canonical: "https://2lnr.com/routes/iah-sdf" url: "https://2lnr.com/routes/iah-sdf.md" date_modified: "2026-10-18T05:10:47Z" --- # Houston to Louisville (IAH-SDF): nonstop upgrade & award space United Airlines and American Airlines fly nonstop between Houston (IAH) and Louisville (SDF), roughly 22 times a week. The timetable below shows the nonstop scheduled at 2h 15m to 2h 25m for the 788 miles. 2LNR checks confirmed upgrade and award space on American Airlines flights on this route, so you can see which departures have space before you book. Schedule last confirmed October 18, 2026. Departure times come from 2LNR's schedule data; confirm with the airline before you book. Updated October 24, 2026. See IAH to SDF on the interactive map [Get started free](https://2lnr.com/login) 22 Flights a week, 4-week average 2h 15m to 2h 25m Scheduled flight time 788 mi Nonstop distance Free To get started ## Houston to Louisville flight schedule Scheduled nonstop departures for IAH to SDF starting October 23, 2026, last checked against our schedule feed on October 18, 2026. Airlines retime and cancel flights, so confirm with the airline before you book. Scheduled nonstop departures from Houston (IAH) to Louisville (SDF) | Date | Flight | Airline | Departs IAH | Arrives SDF | Duration | Aircraft | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | Fri, Oct 23 | UA 3990 | United Airlines | 09:47 | 13:09 | 2h 22m | [Embraer E175](https://2lnr.com/seatmaps/ua/e175.md) | | Fri, Oct 23 | UA 4050 | United Airlines | 16:20 | 19:35 | 2h 15m | Embraer E175 | | Fri, Oct 23 | UA 3985 | United Airlines | 16:32 | 19:55 | 2h 23m | Embraer E175 | | Fri, Oct 23 | UA 4052 | United Airlines | 18:45 | 22:10 | 2h 25m | Embraer E175 | | Sat, Oct 24 | UA 3990 | United Airlines | 09:47 | 13:09 | 2h 22m | Embraer E175 | | Sat, Oct 24 | UA 4050 | United Airlines | 16:20 | 19:35 | 2h 15m | Embraer E175 | | Sat, Oct 24 | UA 3985 | United Airlines | 16:32 | 19:55 | 2h 23m | Embraer E175 | | Sat, Oct 24 | UA 4052 | United Airlines | 18:45 | 22:10 | 2h 25m | Embraer E175 | | Sun, Oct 25 | UA 3990 | United Airlines | 10:00 | 13:23 | 2h 23m | Embraer E175 | | Sun, Oct 25 | UA 4050 | United Airlines | 16:20 | 19:35 | 2h 15m | Embraer E175 | | Sun, Oct 25 | UA 4052 | United Airlines | 18:45 | 22:10 | 2h 25m | Embraer E175 | | Mon, Oct 26 | UA 3990 | United Airlines | 10:00 | 13:23 | 2h 23m | Embraer E175 | | Mon, Oct 26 | UA 4050 | United Airlines | 16:20 | 19:35 | 2h 15m | Embraer E175 | | Mon, Oct 26 | UA 4052 | United Airlines | 18:45 | 22:10 | 2h 25m | Embraer E175 | | Tue, Oct 27 | UA 3990 | United Airlines | 10:00 | 13:23 | 2h 23m | Embraer E175 | | Tue, Oct 27 | UA 4050 | United Airlines | 16:20 | 19:35 | 2h 15m | Embraer E175 | | Tue, Oct 27 | UA 4052 | United Airlines | 18:45 | 22:10 | 2h 25m | Embraer E175 | | Wed, Oct 28 | UA 3990 | United Airlines | 10:00 | 13:23 | 2h 23m | Embraer E175 | | Wed, Oct 28 | UA 4050 | United Airlines | 16:20 | 19:35 | 2h 15m | Embraer E175 | | Wed, Oct 28 | UA 4052 | United Airlines | 18:45 | 22:10 | 2h 25m | Embraer E175 | | Thu, Oct 29 | UA 3990 | United Airlines | 10:00 | 13:23 | 2h 23m | Embraer E175 | | Thu, Oct 29 | UA 4050 | United Airlines | 16:20 | 19:35 | 2h 15m | Embraer E175 | | Thu, Oct 29 | UA 4052 | United Airlines | 18:45 | 22:10 | 2h 25m | Embraer E175 | Showing all 23 scheduled IAH to SDF departures across 7 days with service, starting October 23, 2026. Later dates are on the interactive map. Departure and arrival times are local at their own airport, so an arrival can fall on a different local date than the departure; the duration column is the true elapsed flying time. A dash means the airline hasn't filed that value in the schedule data we hold. Aircraft are the equipment the airline filed, named where the code pins down one type and shown as the family or the bare code where it doesn't. Swaps can happen up to departure. See every IAH to SDF date on the interactive map ## Aircraft on the Houston to Louisville nonstop United Airlines flies the [Embraer E175](https://2lnr.com/seatmaps/ua/e175.md) on every departure in the schedule table on this page. Each linked aircraft page shows where that airline schedules it. Airlines can swap aircraft up to departure. ## Confirmed upgrade & award space on IAH to SDF departures 2LNR tracks confirmed upgrade and award space on American Airlines, segment by segment and date by date. Open the calendar for Houston to Louisville to see which departures have space, the next 14 days free on every product and the full horizon on Pro. ### See real availability Confirmed upgrade or award seats by date on the IAH to SDF departures 2LNR tracks, checked against live inventory so you know what's open before you book. ### Set an alert Premium inventory turns over fast. Watch this route on Pro and 2LNR notifies you when space appears on a date you're tracking. ### Plan on the map See IAH to SDF on the interactive route map, with schedules, connections, and route statistics. ## Airlines flying Houston to Louisville nonstop Carriers operating IAH to SDF nonstop in the current schedule. Where 2LNR tracks the carrier, its departures show confirmed upgrade or award space by date. - [United Airlines (UA) route map](https://2lnr.com/routes/airlines/ua.md)\ [The aircraft UA flies](https://2lnr.com/seatmaps/ua.md) - [American Airlines (AA) route map](https://2lnr.com/routes/airlines/aa.md)\ [The aircraft AA flies](https://2lnr.com/seatmaps/aa.md) See IAH to SDF on the interactive map → ## Frequently asked questions about IAH to SDF **How long is the flight from Houston (IAH) to Louisville (SDF)?** Scheduled flight times from Houston (IAH) to Louisville (SDF) run from 2h 15m to 2h 25m across the departures in the schedule table on this page. The nonstop covers about 788 miles, and airlines adjust scheduled times by season, so confirm with the airline before you book. **Which airlines fly nonstop from IAH to SDF?** United Airlines and American Airlines fly IAH to SDF nonstop. 2LNR tracks confirmed upgrade and award space on American Airlines. **How many flights a week are there from IAH to SDF?** About 22 nonstop flights a week run between Houston (IAH) and Louisville (SDF) in the current schedule, operated by United Airlines and American Airlines. Frequency shifts by season, and the schedule table on this page shows what is scheduled next. **What time do flights from IAH to SDF depart?** Scheduled IAH to SDF nonstops in the next 7 days with service leave between 09:47 and 18:45, local time at Houston. The schedule table on this page lists every departure by date, with its arrival time and aircraft. **Which flights operate IAH to SDF nonstop?** In the schedule table on this page, IAH to SDF nonstops fly as UA 3985, UA 3990, UA 4050, and UA 4052 on United Airlines. The table lists each departure by date with its times and aircraft. **How do I check upgrade or award availability on IAH to SDF?** Open the IAH to SDF route on the interactive map or the matrix to see confirmed upgrade and award space by date on American Airlines, the next 14 days free and the full horizon on Pro. On Pro you can also set an alert on the route and 2LNR notifies you when space opens. Flying the other way? See [SDF to IAH upgrade and award space](https://2lnr.com/routes/sdf-iah.md). Award seats rather than schedules? See [American Airlines award availability](https://2lnr.com/awards/aa.md). Looking beyond this route? See [every route from Houston (IAH)](https://2lnr.com/routes/iah.md), or [every route from Louisville (SDF)](https://2lnr.com/routes/sdf.md). Nonstops to Louisville (SDF) from other airports within 150 miles of Houston (IAH): - [Austin (AUS) to Louisville (SDF)](https://2lnr.com/routes/aus-sdf.md), 140 miles from IAH Nonstops from Houston (IAH) to other airports within 150 miles of Louisville (SDF): - [Houston (IAH) to Cincinnati (CVG)](https://2lnr.com/routes/iah-cvg.md), 84 miles from SDF - [Houston (IAH) to Indianapolis (IND)](https://2lnr.com/routes/iah-ind.md), 111 miles from SDF Distances are great-circle between the airports, not driving distance. - [How American upgrades clear](https://2lnr.com/about/aa/upgrades.md) - [How to read award availability by date](https://2lnr.com/guides/award-availability.md) ## Never miss IAH to SDF upgrade or award space See what's open by date on this route, the next 14 days free on every product and the full horizon on Pro. 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