United Flight 4478 Deals & Information (2026/2027)

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United Flight 4478 Route Deals From $219

The cheapest prices found with in the last 7 days for return flights were $194 and $219 for one-way flights to Blue Grass for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Feb 10 - Sat, Feb 14
ORD
O'Hare Intl.
LEX
Blue Grass
$194 Roundtrip, found 6 days ago
$194
Roundtrip
found 6 days ago
Select United flight, departing Tue, Feb 10 from O'Hare Intl. to Blue Grass, returning Sat, Feb 14, priced at $194 found 6 days ago
Fri, Jan 30 - Sun, Feb 1
ORD
O'Hare Intl.
LEX
Blue Grass
$206 Roundtrip, found 5 days ago
$206
Roundtrip
found 5 days ago
Select United flight, departing Fri, Jan 30 from O'Hare Intl. to Blue Grass, returning Sun, Feb 1, priced at $206 found 5 days ago
Fri, Jan 30 - Sun, Feb 1
ORD
O'Hare Intl.
LEX
Blue Grass
$220 Roundtrip, found 5 days ago
$220
Roundtrip
found 5 days ago
Select United flight, departing Fri, Jan 30 from O'Hare Intl. to Blue Grass, returning Sun, Feb 1, priced at $220 found 5 days ago
Sun, Mar 15 - Sat, Mar 21
ORD
O'Hare Intl.
LEX
Blue Grass
$222 Roundtrip, found 4 days ago
$222
Roundtrip
found 4 days ago
Select United flight, departing Sun, Mar 15 from O'Hare Intl. to Blue Grass, returning Sat, Mar 21, priced at $222 found 4 days ago
Fri, Jan 30 - Sun, Feb 1
ORD
O'Hare Intl.
LEX
Blue Grass
$254 Roundtrip, found 5 days ago
$254
Roundtrip
found 5 days ago
Select United flight, departing Fri, Jan 30 from O'Hare Intl. to Blue Grass, returning Sun, Feb 1, priced at $254 found 5 days ago
Thu, Feb 12 - Mon, Feb 16
ORD
O'Hare Intl.
LEX
Blue Grass
$269 Roundtrip, found 3 days ago
$269
Roundtrip
found 3 days ago
Select United flight, departing Thu, Feb 12 from O'Hare Intl. to Blue Grass, returning Mon, Feb 16, priced at $269 found 3 days ago
Thu, Oct 8 - Mon, Oct 12
ORD
O'Hare Intl.
LEX
Blue Grass
$276 Roundtrip, found 1 day ago
$276
Roundtrip
found 1 day ago
Select United flight, departing Thu, Oct 8 from O'Hare Intl. to Blue Grass, returning Mon, Oct 12, priced at $276 found 1 day ago
Thu, Oct 8 - Mon, Oct 12
ORD
O'Hare Intl.
LEX
Blue Grass
$296 Roundtrip, found 1 day ago
$296
Roundtrip
found 1 day ago
Select United flight, departing Thu, Oct 8 from O'Hare Intl. to Blue Grass, returning Mon, Oct 12, priced at $296 found 1 day ago
Fri, Feb 6 - Sun, Feb 8
ORD
O'Hare Intl.
LEX
Blue Grass
$297 Roundtrip, found 1 day ago
$297
Roundtrip
found 1 day ago
Select United flight, departing Fri, Feb 6 from O'Hare Intl. to Blue Grass, returning Sun, Feb 8, priced at $297 found 1 day ago

Frequently asked questions

What route does flight number UA4478 take?
UA4478 takes roughly 2 hours and 1 minute to jet directly from STL to IAD. We all know there's magic in the destination, but half the fun is in the journey!
What terminal does UA4478 fly out of?
Passengers on flight number UA4478 from STL to IAD typically fly out of Terminal 1.
What kind of plane is on flight number UA4478?
The Canadair (Bombardier) Regional Jet 550 is the type of aircraft most commonly used for flight number UA4478. This flight almost always leaves from Lambert Field and lands at IAD.
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 UA4478 flight with Travelocity, please visit our Customer Service Portal.