Cheap Flights To Illinois

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Illinois Flights as Low as $133

These prices were available within the past 7 days. Prices quoted are per person, round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Oct 8 - Mon, Oct 13
DEN
Denver Intl.
ORD
O'Hare Intl.
$133 Roundtrip, found 6 days ago
$133
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Wed, Oct 8 from Denver Intl. to O'Hare Intl., returning Mon, Oct 13, priced at $133 found 6 days ago
Frontier Airlines
Wed, Sep 24 - Mon, Sep 29
DEN
Denver Intl.
ORD
O'Hare Intl.
$134 Roundtrip, found 21 hours ago
$134
Roundtrip
found 21 hours ago
Select Frontier Airlines flight, departing Wed, Sep 24 from Denver Intl. to O'Hare Intl., returning Mon, Sep 29, priced at $134 found 21 hours ago
Frontier Airlines
Wed, Aug 6 - Tue, Aug 12
DEN
Denver Intl.
ORD
O'Hare Intl.
$139 Roundtrip, found 1 day ago
$139
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Aug 6 from Denver Intl. to O'Hare Intl., returning Tue, Aug 12, priced at $139 found 1 day ago
American Airlines
Wed, Sep 24 - Mon, Sep 29
DEN
Denver Intl.
ORD
O'Hare Intl.
$151 Roundtrip, found 21 hours ago
$151
Roundtrip
found 21 hours ago
Select American Airlines flight, departing Wed, Sep 24 from Denver Intl. to O'Hare Intl., returning Mon, Sep 29, priced at $151 found 21 hours ago
United
Wed, Sep 24 - Mon, Sep 29
DEN
Denver Intl.
ORD
O'Hare Intl.
$151 Roundtrip, found 21 hours ago
$151
Roundtrip
found 21 hours ago
Select United flight, departing Wed, Sep 24 from Denver Intl. to O'Hare Intl., returning Mon, Sep 29, priced at $151 found 21 hours ago
Frontier Airlines
Wed, Sep 24 - Mon, Sep 29
DEN
Denver Intl.
ORD
O'Hare Intl.
$160 Roundtrip, found 21 hours ago
$160
Roundtrip
found 21 hours ago
Select Frontier Airlines flight, departing Wed, Sep 24 from Denver Intl. to O'Hare Intl., returning Mon, Sep 29, priced at $160 found 21 hours ago
Delta
Wed, Sep 24 - Mon, Sep 29
DEN
Denver Intl.
ORD
O'Hare Intl.
$184 Roundtrip, found 21 hours ago
$184
Roundtrip
found 21 hours ago
Select Delta flight, departing Wed, Sep 24 from Denver Intl. to O'Hare Intl., returning Mon, Sep 29, priced at $184 found 21 hours ago
Alaska Airlines
Sat, Oct 11 - Sat, Oct 18
ONT
Los Angeles - Ontario Intl.
ORD
O'Hare Intl.
$318 Roundtrip, found 2 days ago
$318
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Sat, Oct 11 from Los Angeles - Ontario Intl. to O'Hare Intl., returning Sat, Oct 18, priced at $318 found 2 days ago