American Airlines Flight AA3899 Deals & Information (2025/2026)

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American Airlines Flight 3899 Route Deals From $134

The cheapest prices found with in the last 7 days for return flights were $215 and $134 for one-way flights to O'Hare Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Aug 1 - Mon, Aug 4
MSO
Missoula Intl.
ORD
O'Hare Intl.
$215 Roundtrip, just found
$215
Roundtrip
just found
Select American Airlines flight, departing Fri, Aug 1 from Missoula Intl. to O'Hare Intl., returning Mon, Aug 4, priced at $215 just found
Wed, Aug 13 - Sun, Aug 17
MSO
Missoula Intl.
ORD
O'Hare Intl.
$246 Roundtrip, found 3 days ago
$246
Roundtrip
found 3 days ago
Select American Airlines flight, departing Wed, Aug 13 from Missoula Intl. to O'Hare Intl., returning Sun, Aug 17, priced at $246 found 3 days ago
Wed, Aug 13 - Sun, Aug 17
MSO
Missoula Intl.
ORD
O'Hare Intl.
$265 Roundtrip, found 3 days ago
$265
Roundtrip
found 3 days ago
Select American Airlines flight, departing Wed, Aug 13 from Missoula Intl. to O'Hare Intl., returning Sun, Aug 17, priced at $265 found 3 days ago