American Airlines Flight AA3421 Deals & Information (2025/2026)

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American Airlines Flight 3421 Route Deals From $345

The cheapest prices found with in the last 7 days for return flights were $355 and $345 for one-way flights to O'Hare Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Jul 4 - Sat, Jul 19
CMI
University Of Illinois Urbana-Champaign Williard
ORD
O'Hare Intl.
$355 Roundtrip, found 3 days ago
$355
Roundtrip
found 3 days ago
Select American Airlines flight, departing Fri, Jul 4 from University Of Illinois Urbana-Champaign Williard to O'Hare Intl., returning Sat, Jul 19, priced at $355 found 3 days ago
Tue, Jul 15 - Wed, Jul 30
CMI
University Of Illinois Urbana-Champaign Williard
ORD
O'Hare Intl.
$363 Roundtrip, found 14 hours ago
$363
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Tue, Jul 15 from University Of Illinois Urbana-Champaign Williard to O'Hare Intl., returning Wed, Jul 30, priced at $363 found 14 hours ago
Wed, Jul 16 - Tue, Jul 29
CMI
University Of Illinois Urbana-Champaign Williard
ORD
O'Hare Intl.
$365 Roundtrip, found 3 days ago
$365
Roundtrip
found 3 days ago
Select American Airlines flight, departing Wed, Jul 16 from University Of Illinois Urbana-Champaign Williard to O'Hare Intl., returning Tue, Jul 29, priced at $365 found 3 days ago
Tue, Jul 15 - Tue, Jul 29
CMI
University Of Illinois Urbana-Champaign Williard
ORD
O'Hare Intl.
$372 Roundtrip, found 14 hours ago
$372
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Tue, Jul 15 from University Of Illinois Urbana-Champaign Williard to O'Hare Intl., returning Tue, Jul 29, priced at $372 found 14 hours ago
Fri, Jul 4 - Sun, Jul 13
CMI
University Of Illinois Urbana-Champaign Williard
ORD
O'Hare Intl.
$388 Roundtrip, found 3 days ago
$388
Roundtrip
found 3 days ago
Select American Airlines flight, departing Fri, Jul 4 from University Of Illinois Urbana-Champaign Williard to O'Hare Intl., returning Sun, Jul 13, priced at $388 found 3 days ago
Tue, Jul 15 - Sun, Jul 27
CMI
University Of Illinois Urbana-Champaign Williard
ORD
O'Hare Intl.
$396 Roundtrip, found 14 hours ago
$396
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Tue, Jul 15 from University Of Illinois Urbana-Champaign Williard to O'Hare Intl., returning Sun, Jul 27, priced at $396 found 14 hours ago
Fri, Jul 4 - Tue, Jul 8
CMI
University Of Illinois Urbana-Champaign Williard
ORD
O'Hare Intl.
$405 Roundtrip, found 3 days ago
$405
Roundtrip
found 3 days ago
Select American Airlines flight, departing Fri, Jul 4 from University Of Illinois Urbana-Champaign Williard to O'Hare Intl., returning Tue, Jul 8, priced at $405 found 3 days ago
Fri, Jul 4 - Thu, Jul 10
CMI
University Of Illinois Urbana-Champaign Williard
ORD
O'Hare Intl.
$408 Roundtrip, found 3 days ago
$408
Roundtrip
found 3 days ago
Select American Airlines flight, departing Fri, Jul 4 from University Of Illinois Urbana-Champaign Williard to O'Hare Intl., returning Thu, Jul 10, priced at $408 found 3 days ago
Wed, Jul 9 - Wed, Jul 30
CMI
University Of Illinois Urbana-Champaign Williard
ORD
O'Hare Intl.
$414 Roundtrip, found 14 hours ago
$414
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Wed, Jul 9 from University Of Illinois Urbana-Champaign Williard to O'Hare Intl., returning Wed, Jul 30, priced at $414 found 14 hours ago
Sat, Jun 28 - Tue, Jul 1
CMI
University Of Illinois Urbana-Champaign Williard
ORD
O'Hare Intl.
$415 Roundtrip, found 3 days ago
$415
Roundtrip
found 3 days ago
Select American Airlines flight, departing Sat, Jun 28 from University Of Illinois Urbana-Champaign Williard to O'Hare Intl., returning Tue, Jul 1, priced at $415 found 3 days ago