American Airlines Flight 3899 Deals & Information (2025/2026)

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American Airlines Flight 3899 Route Deals From $115

The cheapest prices found with in the last 7 days for return flights were $201 and $115 for one-way flights to O'Hare Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Sep 25 - Sun, Sep 28
MSO
Missoula Intl.
ORD
O'Hare Intl.
$201 Roundtrip, found 1 day ago
$201
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Sep 25 from Missoula Intl. to O'Hare Intl., returning Sun, Sep 28, priced at $201 found 1 day ago
Thu, Sep 25 - Sun, Sep 28
MSO
Missoula Intl.
ORD
O'Hare Intl.
$220 Roundtrip, found 1 day ago
$220
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Sep 25 from Missoula Intl. to O'Hare Intl., returning Sun, Sep 28, priced at $220 found 1 day ago
Thu, Sep 25 - Sun, Sep 28
MSO
Missoula Intl.
ORD
O'Hare Intl.
$230 Roundtrip, found 1 day ago
$230
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Sep 25 from Missoula Intl. to O'Hare Intl., returning Sun, Sep 28, priced at $230 found 1 day ago
Thu, Sep 25 - Sun, Sep 28
MSO
Missoula Intl.
ORD
O'Hare Intl.
$237 Roundtrip, found 1 day ago
$237
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Sep 25 from Missoula Intl. to O'Hare Intl., returning Sun, Sep 28, priced at $237 found 1 day ago
Thu, Sep 25 - Sun, Sep 28
MSO
Missoula Intl.
ORD
O'Hare Intl.
$249 Roundtrip, found 1 day ago
$249
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Sep 25 from Missoula Intl. to O'Hare Intl., returning Sun, Sep 28, priced at $249 found 1 day ago
Wed, Aug 13 - Sun, Aug 24
MSO
Missoula Intl.
ORD
O'Hare Intl.
$273 Roundtrip, found 8 hours ago
$273
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Wed, Aug 13 from Missoula Intl. to O'Hare Intl., returning Sun, Aug 24, priced at $273 found 8 hours ago
Thu, Sep 25 - Sun, Sep 28
MSO
Missoula Intl.
ORD
O'Hare Intl.
$278 Roundtrip, found 1 day ago
$278
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Sep 25 from Missoula Intl. to O'Hare Intl., returning Sun, Sep 28, priced at $278 found 1 day ago
Thu, Sep 25 - Sun, Sep 28
MSO
Missoula Intl.
ORD
O'Hare Intl.
$279 Roundtrip, found 1 day ago
$279
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Sep 25 from Missoula Intl. to O'Hare Intl., returning Sun, Sep 28, priced at $279 found 1 day ago
Thu, Sep 25 - Sun, Sep 28
MSO
Missoula Intl.
ORD
O'Hare Intl.
$281 Roundtrip, found 1 day ago
$281
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Sep 25 from Missoula Intl. to O'Hare Intl., returning Sun, Sep 28, priced at $281 found 1 day ago
Thu, Aug 21 - Sun, Aug 24
MSO
Missoula Intl.
ORD
O'Hare Intl.
$283 Roundtrip, found 12 hours ago
$283
Roundtrip
found 12 hours ago
Select American Airlines flight, departing Thu, Aug 21 from Missoula Intl. to O'Hare Intl., returning Sun, Aug 24, priced at $283 found 12 hours ago
Thu, Sep 25 - Sun, Sep 28
MSO
Missoula Intl.
ORD
O'Hare Intl.
$300 Roundtrip, found 1 day ago
$300
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Sep 25 from Missoula Intl. to O'Hare Intl., returning Sun, Sep 28, priced at $300 found 1 day ago