United Flight NK3678 Deals & Information (2025/2026)

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United Flight 3678 Route Deals From $101

The cheapest prices found with in the last 7 days for return flights were $197 and $101 for one-way flights to Louisville Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Aug 20 - Wed, Aug 27
EWR
Newark Liberty Intl. Airport
SDF
Louisville Intl.
$197 Roundtrip, found 3 days ago
$197
Roundtrip
found 3 days ago
Select United flight, departing Wed, Aug 20 from Newark Liberty Intl. Airport to Louisville Intl., returning Wed, Aug 27, priced at $197 found 3 days ago
Sat, Jul 12 - Sun, Jul 20
EWR
Newark Liberty Intl. Airport
SDF
Louisville Intl.
$201 Roundtrip, found 1 day ago
$201
Roundtrip
found 1 day ago
Select United flight, departing Sat, Jul 12 from Newark Liberty Intl. Airport to Louisville Intl., returning Sun, Jul 20, priced at $201 found 1 day ago

Frequently asked questions

What route does flight number UA3678 take?
Flight number UA3678 takes around 1 hour and 44 minutes to fly direct from O'Hare Intl. Airport (ORD) to Knoxville Airport. We all know there's magic in the destination, but half the fun is in the journey!
What terminal does UA3678 fly out of?
Direct flights between Chicago, IL Airport (ORD-O'Hare Intl.) and TYS are served by flight number UA3678, and travelers with a seat booked on this flight normally jet off from Terminal 2.
What kind of plane is on flight number UA3678?
The route for flight number UA3678 is most commonly O'Hare Intl. Airport (ORD) to Knoxville, TN Airport (TYS-McGhee Tyson), and the Embraer 175 is the type of plane you'll probably be heading off on.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your UA3678 flight with Travelocity, please visit our Customer Service Portal.