United Flight NK3678 Deals & Information (2025/2026)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

United Flight 3678 Route Deals From $106

The cheapest prices found with in the last 7 days for return flights were $209 and $106 for one-way flights to Louisville Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Oct 3 - Mon, Oct 6
EWR
Newark Liberty Intl. Airport
SDF
Louisville Intl.
$209 Roundtrip, found 1 day ago
$209
Roundtrip
found 1 day ago
Select United flight, departing Fri, Oct 3 from Newark Liberty Intl. Airport to Louisville Intl., returning Mon, Oct 6, priced at $209 found 1 day ago
Fri, Apr 24 - Tue, Apr 28
EWR
Newark Liberty Intl. Airport
SDF
Louisville Intl.
$218 Roundtrip, found 1 day ago
$218
Roundtrip
found 1 day ago
Select United flight, departing Fri, Apr 24 from Newark Liberty Intl. Airport to Louisville Intl., returning Tue, Apr 28, priced at $218 found 1 day ago
Fri, Oct 3 - Sun, Oct 5
EWR
Newark Liberty Intl. Airport
SDF
Louisville Intl.
$219 Roundtrip, found 10 hours ago
$219
Roundtrip
found 10 hours ago
Select United flight, departing Fri, Oct 3 from Newark Liberty Intl. Airport to Louisville Intl., returning Sun, Oct 5, priced at $219 found 10 hours ago
Fri, Aug 22 - Tue, Aug 26
EWR
Newark Liberty Intl. Airport
SDF
Louisville Intl.
$221 Roundtrip, found 3 days ago
$221
Roundtrip
found 3 days ago
Select United flight, departing Fri, Aug 22 from Newark Liberty Intl. Airport to Louisville Intl., returning Tue, Aug 26, priced at $221 found 3 days ago
Fri, Apr 24 - Tue, Apr 28
EWR
Newark Liberty Intl. Airport
SDF
Louisville Intl.
$221 Roundtrip, found 1 day ago
$221
Roundtrip
found 1 day ago
Select United flight, departing Fri, Apr 24 from Newark Liberty Intl. Airport to Louisville Intl., returning Tue, Apr 28, priced at $221 found 1 day ago
Sat, Aug 23 - Wed, Aug 27
EWR
Newark Liberty Intl. Airport
SDF
Louisville Intl.
$225 Roundtrip, found 4 days ago
$225
Roundtrip
found 4 days ago
Select United flight, departing Sat, Aug 23 from Newark Liberty Intl. Airport to Louisville Intl., returning Wed, Aug 27, priced at $225 found 4 days ago
Fri, Oct 3 - Mon, Oct 6
EWR
Newark Liberty Intl. Airport
SDF
Louisville Intl.
$227 Roundtrip, found 1 day ago
$227
Roundtrip
found 1 day ago
Select United flight, departing Fri, Oct 3 from Newark Liberty Intl. Airport to Louisville Intl., returning Mon, Oct 6, priced at $227 found 1 day ago
Fri, Apr 24 - Tue, Apr 28
EWR
Newark Liberty Intl. Airport
SDF
Louisville Intl.
$228 Roundtrip, found 1 day ago
$228
Roundtrip
found 1 day ago
Select United flight, departing Fri, Apr 24 from Newark Liberty Intl. Airport to Louisville Intl., returning Tue, Apr 28, priced at $228 found 1 day ago
Fri, Apr 24 - Tue, Apr 28
EWR
Newark Liberty Intl. Airport
SDF
Louisville Intl.
$233 Roundtrip, found 1 day ago
$233
Roundtrip
found 1 day ago
Select United flight, departing Fri, Apr 24 from Newark Liberty Intl. Airport to Louisville Intl., returning Tue, Apr 28, priced at $233 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.